{"id":3890,"date":"2025-11-09T14:50:41","date_gmt":"2025-11-09T14:50:41","guid":{"rendered":"https:\/\/physicscatalyst.com\/testprep\/class-7-science\/exploring-substances-acidicbasic-and-neutral\/"},"modified":"2025-11-09T14:50:41","modified_gmt":"2025-11-09T14:50:41","slug":"exploring-substances-acidicbasic-and-neutral","status":"publish","type":"post","link":"https:\/\/physicscatalyst.com\/testprep\/class-7-science\/exploring-substances-acidicbasic-and-neutral\/","title":{"rendered":"Exploring Substances: Acidic,Basic, and Neutral"},"content":{"rendered":"<script type=\"text\/javascript\" >\ndocument.addEventListener(\"DOMContentLoaded\", function(event) { \nif(!window.jQuery) alert(\"The important jQuery library is not properly loaded in your site. Your WordPress theme is probably missing the essential wp_head() call. You can switch to another theme and you will see that the plugin works fine and this notice disappears. If you are still not sure what to do you can contact us for help.\");\n});\n<\/script>  \n  \n<div  id=\"watupro_quiz\" class=\"quiz-area single-page-quiz\">\n<p id=\"submittingExam487\" style=\"display:none;text-align:center;\">Please wait...<br><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/physicscatalyst.com\/testprep\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\"><\/p>\n\n<div class=\"watupro-exam-description\" id=\"description-quiz-487\"><p><strong>General Instructions<\/strong><\/p>\n<ul>\n<li>Your test contains multiple-choice questions with only one answer-type question. There are a total of 10 questions<\/li>\n<li>This is a 20 min test. Please make sure you complete it in the stipulated time<\/li>\n<li>You can finish this test any time using the <span style=\"color: #ff0000;\"><strong>'Submit'<\/strong><\/span> button.<\/li>\n<\/ul>\n<\/div>\n\n<form action=\"\" method=\"post\" class=\"quiz-form\" id=\"quiz-487\"  enctype=\"multipart\/form-data\" >\n<div class='watu-question ' id='question-1' style=';'><div id='questionWrap-1'  class='   watupro-question-id-8291'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>1. <\/span>Acid turns blue litmus paper to .........<\/div><input type='hidden' name='question_id[]' id='qID_1' value='8291' class='watupro-question-id'\/><input type='hidden' id='answerType8291' class='answerTypeCnt1' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8291'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8291[]' id='answer-id-33114' class='answer   answerof-8291  ' value='33114'   \/><label for='answer-id-33114' id='answer-label-33114' class=' answer'><span>yellow<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8291[]' id='answer-id-33115' class='answer   answerof-8291  ' value='33115'   \/><label for='answer-id-33115' id='answer-label-33115' class=' answer'><span>greed<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8291[]' id='answer-id-33116' class='answer   answerof-8291  ' value='33116'   \/><label for='answer-id-33116' id='answer-label-33116' class=' answer'><span>red<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8291[]' id='answer-id-33117' class='answer   answerof-8291  ' value='33117'   \/><label for='answer-id-33117' id='answer-label-33117' class=' answer'><span>no change<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-2' style=';'><div id='questionWrap-2'  class='   watupro-question-id-8292'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>2. <\/span>which of these is not an acid -base indicator?<\/div><input type='hidden' name='question_id[]' id='qID_2' value='8292' class='watupro-question-id'\/><input type='hidden' id='answerType8292' class='answerTypeCnt2' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8292'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8292[]' id='answer-id-33118' class='answer   answerof-8292  ' value='33118'   \/><label for='answer-id-33118' id='answer-label-33118' class=' answer'><span>lichen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8292[]' id='answer-id-33119' class='answer   answerof-8292  ' value='33119'   \/><label for='answer-id-33119' id='answer-label-33119' class=' answer'><span>red rose<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8292[]' id='answer-id-33120' class='answer   answerof-8292  ' value='33120'   \/><label for='answer-id-33120' id='answer-label-33120' class=' answer'><span>red hibiscus<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8292[]' id='answer-id-33121' class='answer   answerof-8292  ' value='33121'   \/><label for='answer-id-33121' id='answer-label-33121' class=' answer'><span>sugar solution<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-3' style=';'><div id='questionWrap-3'  class='   watupro-question-id-8293'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>3. <\/span>which of the following is a base?<\/div><input type='hidden' name='question_id[]' id='qID_3' value='8293' class='watupro-question-id'\/><input type='hidden' id='answerType8293' class='answerTypeCnt3' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8293'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8293[]' id='answer-id-33122' class='answer   answerof-8293  ' value='33122'   \/><label for='answer-id-33122' id='answer-label-33122' class=' answer'><span>lemon juice<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8293[]' id='answer-id-33123' class='answer   answerof-8293  ' value='33123'   \/><label for='answer-id-33123' id='answer-label-33123' class=' answer'><span>tamarind water<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8293[]' id='answer-id-33124' class='answer   answerof-8293  ' value='33124'   \/><label for='answer-id-33124' id='answer-label-33124' class=' answer'><span>vinegar<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8293[]' id='answer-id-33125' class='answer   answerof-8293  ' value='33125'   \/><label for='answer-id-33125' id='answer-label-33125' class=' answer'><span>lime water<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-4' style=';'><div id='questionWrap-4'  class='   watupro-question-id-8294'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>4. <\/span>which of the following is an acid?<\/div><input type='hidden' name='question_id[]' id='qID_4' value='8294' class='watupro-question-id'\/><input type='hidden' id='answerType8294' class='answerTypeCnt4' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8294'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8294[]' id='answer-id-33126' class='answer   answerof-8294  ' value='33126'   \/><label for='answer-id-33126' id='answer-label-33126' class=' answer'><span>soap solution<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8294[]' id='answer-id-33127' class='answer   answerof-8294  ' value='33127'   \/><label for='answer-id-33127' id='answer-label-33127' class=' answer'><span>baking soda solution<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8294[]' id='answer-id-33128' class='answer   answerof-8294  ' value='33128'   \/><label for='answer-id-33128' id='answer-label-33128' class=' answer'><span>amla juice<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8294[]' id='answer-id-33129' class='answer   answerof-8294  ' value='33129'   \/><label for='answer-id-33129' id='answer-label-33129' class=' answer'><span>washing powder solution<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-5' style=';'><div id='questionWrap-5'  class='   watupro-question-id-8295'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>5. <\/span>which of these a natural indicator?<\/div><input type='hidden' name='question_id[]' id='qID_5' value='8295' class='watupro-question-id'\/><input type='hidden' id='answerType8295' class='answerTypeCnt5' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8295'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8295[]' id='answer-id-33130' class='answer   answerof-8295  ' value='33130'   \/><label for='answer-id-33130' id='answer-label-33130' class=' answer'><span>sugar solution<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8295[]' id='answer-id-33131' class='answer   answerof-8295  ' value='33131'   \/><label for='answer-id-33131' id='answer-label-33131' class=' answer'><span>salt water solution<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8295[]' id='answer-id-33132' class='answer   answerof-8295  ' value='33132'   \/><label for='answer-id-33132' id='answer-label-33132' class=' answer'><span>Turmeric <\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8295[]' id='answer-id-33133' class='answer   answerof-8295  ' value='33133'   \/><label for='answer-id-33133' id='answer-label-33133' class=' answer'><span>None of the above<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-6' style=';'><div id='questionWrap-6'  class='   watupro-question-id-8296'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>6. <\/span>'Litmus', a natural dye is an extract of which of the following?<\/div><input type='hidden' name='question_id[]' id='qID_6' value='8296' class='watupro-question-id'\/><input type='hidden' id='answerType8296' class='answerTypeCnt6' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8296'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8296[]' id='answer-id-33134' class='answer   answerof-8296  ' value='33134'   \/><label for='answer-id-33134' id='answer-label-33134' class=' answer'><span>China rose (Gudhal)<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8296[]' id='answer-id-33135' class='answer   answerof-8296  ' value='33135'   \/><label for='answer-id-33135' id='answer-label-33135' class=' answer'><span>Beetroot<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8296[]' id='answer-id-33136' class='answer   answerof-8296  ' value='33136'   \/><label for='answer-id-33136' id='answer-label-33136' class=' answer'><span>Lichen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8296[]' id='answer-id-33137' class='answer   answerof-8296  ' value='33137'   \/><label for='answer-id-33137' id='answer-label-33137' class=' answer'><span>Blue berries (Jamun)<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-7' style=';'><div id='questionWrap-7'  class='   watupro-question-id-8297'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>7. <\/span>Which of the following statements is correct?<\/div><input type='hidden' name='question_id[]' id='qID_7' value='8297' class='watupro-question-id'\/><input type='hidden' id='answerType8297' class='answerTypeCnt7' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8297'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8297[]' id='answer-id-33138' class='answer   answerof-8297  ' value='33138'   \/><label for='answer-id-33138' id='answer-label-33138' class=' answer'><span> Indicator is a substance that shows different colors in acidic and basic solution.<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8297[]' id='answer-id-33139' class='answer   answerof-8297  ' value='33139'   \/><label for='answer-id-33139' id='answer-label-33139' class=' answer'><span>Turmeric stain on a white shut turns to red when it is washed with soap.<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8297[]' id='answer-id-33140' class='answer   answerof-8297  ' value='33140'   \/><label for='answer-id-33140' id='answer-label-33140' class=' answer'><span>Lime water is a solution of calcium hydroxide.<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8297[]' id='answer-id-33141' class='answer   answerof-8297  ' value='33141'   \/><label for='answer-id-33141' id='answer-label-33141' class=' answer'><span>All the above are correct.<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-8' style=';'><div id='questionWrap-8'  class='   watupro-question-id-8298'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>8. <\/span>Consider the following statements:<br \/>\r\n(a) Both acids and bases change colour of all indicators.<br \/>\r\n(b) If an indicator gives a colour change with an acid, it does not give a change with a base.<br \/>\r\n(c) If an indicator changes colour with a base, it does not change colour with an acid.<br \/>\r\n(d) Change of colour in an acid and a base depends on the type of the indicator.<br \/>\r\n<br \/>\r\nWhich of these statements are correct?<\/div><input type='hidden' name='question_id[]' id='qID_8' value='8298' class='watupro-question-id'\/><input type='hidden' id='answerType8298' class='answerTypeCnt8' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8298'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8298[]' id='answer-id-33142' class='answer   answerof-8298  ' value='33142'   \/><label for='answer-id-33142' id='answer-label-33142' class=' answer'><span>All four<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8298[]' id='answer-id-33143' class='answer   answerof-8298  ' value='33143'   \/><label for='answer-id-33143' id='answer-label-33143' class=' answer'><span>a and d<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8298[]' id='answer-id-33144' class='answer   answerof-8298  ' value='33144'   \/><label for='answer-id-33144' id='answer-label-33144' class=' answer'><span>b and c<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8298[]' id='answer-id-33145' class='answer   answerof-8298  ' value='33145'   \/><label for='answer-id-33145' id='answer-label-33145' class=' answer'><span>only d<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-9' style=';'><div id='questionWrap-9'  class='   watupro-question-id-8299'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>9. <\/span>what is the nature of the washing power solution?<\/div><input type='hidden' name='question_id[]' id='qID_9' value='8299' class='watupro-question-id'\/><input type='hidden' id='answerType8299' class='answerTypeCnt9' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8299'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8299[]' id='answer-id-33146' class='answer   answerof-8299  ' value='33146'   \/><label for='answer-id-33146' id='answer-label-33146' class=' answer'><span>Acidic<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8299[]' id='answer-id-33147' class='answer   answerof-8299  ' value='33147'   \/><label for='answer-id-33147' id='answer-label-33147' class=' answer'><span>Basic<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8299[]' id='answer-id-33148' class='answer   answerof-8299  ' value='33148'   \/><label for='answer-id-33148' id='answer-label-33148' class=' answer'><span>Neutral<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8299[]' id='answer-id-33149' class='answer   answerof-8299  ' value='33149'   \/><label for='answer-id-33149' id='answer-label-33149' class=' answer'><span>Salt solution<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-10' style=';'><div id='questionWrap-10'  class='   watupro-question-id-8300'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>10. <\/span>what is the product of the neutrilization\u00a0 reaction?<\/div><input type='hidden' name='question_id[]' id='qID_10' value='8300' class='watupro-question-id'\/><input type='hidden' id='answerType8300' class='answerTypeCnt10' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8300'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8300[]' id='answer-id-33150' class='answer   answerof-8300  ' value='33150'   \/><label for='answer-id-33150' id='answer-label-33150' class=' answer'><span>acid and water<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8300[]' id='answer-id-33151' class='answer   answerof-8300  ' value='33151'   \/><label for='answer-id-33151' id='answer-label-33151' class=' answer'><span>salt and water + heat<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8300[]' id='answer-id-33152' class='answer   answerof-8300  ' value='33152'   \/><label for='answer-id-33152' id='answer-label-33152' class=' answer'><span>water<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8300[]' id='answer-id-33153' class='answer   answerof-8300  ' value='33153'   \/><label for='answer-id-33153' 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