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Class 10 Science Acid base and Salts Practice test Paper



In this page we have Class 10 Science Acid base and Salts Practice test Paper . Hope you like them and do not forget to like , social shar and comment at the end of the page. a. Very Short Answer type
b. Short Answer Questions
c. Long answer questions(5 Marks)


Very Short Answer type


Question 1
Write the neutralization reaction of acids?
Question 2
Write the name of the products obtained when zinc metal pieces are dropped into sodium hydroxide bottle.

Answer

2NaOH +Zn-> Na2ZnO2 + H2
Products are Sodium zincate and hydrogen


Question 3
What is the nature of baking soda?
Question 4
What are olfactory indicators?

Answer

olfactory indicators are those indicators that help to identify whether the given solution is acidic or basic by changing their smell instead of colour as other indicators do.

olfactory indicator" implies that this is a compound whose can smell you can detect... vanilla, clove and onion are all olfactory indicators as these do not give their distinct odour in highly alkaline(basic) medium.


Question 5
Write an equation for the action of dilute hydrochloric acid on marble chips.

Answer

Marble is nothing but calcium carbonate
CaCO3 + HCl -> CaCl2 + H20 + CO2


Question 6
Write the chemical name and formula of washing soda?

Answer

Sodium Carbonate
Na2CO3.10H2O


Question 7
Write the preparation of sodium hydroxide?
Question 8
Name the raw materials required to manufacture bleaching powder.
Question 9
Write the chemical formula of plaster of paris and gypsum?
Question 10
What happen when excess of CO2 passes from lime water?
Question 11
Why does dry HCL gas not change the colour of the dry litmus paper?
Question 12
What effect does the concentration of H+ (aq) have on acidic nature of the solution?
Question 13
Write the reaction between dilute NaOH solution and dilute HCI acid.
Question 14
Why does an aqueous solution of an acid conduct electricity?
Question 15
What is chloro- alkali process.

Answer

When concentrated solution of sodium chloride is electrolysed it forms Chlorine gas, Sodium hydroxide and Hydrogen gas. It is called chlor-alkali process because of the products formed- Chlor for chlorine gas and alkali for Sodium hydroxide. Chlorine is formed at anode and Hydrogen is formed at the cathode and Na(OH)2 is formed near the cathode.

The main products formed are: Chlorine and Sodium Hydroxide


Question 16
Write the name and the chemical formula of the organic acid present in vinegar.

Answer

name of the acid - acetic acid (CH3C00H)


Question 17
What are alkalies? Given one example of alkalies?
Question 18
Is Water a strong acid or a weak acid?
Question 19
What is the common name of the compound CaOCl2?

Answer

Calcium Oxy chloride. Common name is bleaching power


Question 20
Name the acids present in wasp sting.
Question 21
what is the pH of a neutral solution?

Answer

7


Question 22
Name two indicators which are widely used in laboratories.
Question 23
What are olfactory indicators? Give an example
Question 24
What is brine?
Question 25
What happens to the temperature of water when few drops of concentrated sulphuric acid is added to it?
Question 26
Which compound of sodium is used for softening of hard water?

Short answer type


Question 1
Why do HCL, HNO3 etc., show acidic characters in aqueous solution while solutions of compounds like alcohol and glucose do not show acidic character?
Question 2
What are hydronium ions?
Question 3
What is meant by strong acids and weak acids? Classify the following into strong acids and weak acids :-
HCL, HNO3, H2CO3, H2SO3, CH3COOH

Answer


Strong Acid: HCl HNO3 Weak Acid:H2CO3, H2SO3, CH3COOH


Question 4
What happens when a solution of sodium hydrogen carbonate is heated? Write equation of the reaction is involved.
Question 5
What happens when base react with non metal oxide?
Question 6
What is water of crystallization? Give some examples of salt having water of crystallization? Give some example of salt having water of crystallization?
Question 7
Classify each of the following substance as a weak acid, strong acid, weak base, strong base, both a weak acid and a weak base, or neither an acid nor a base :
H2CO3
HCIO4
NaCIO4
CH3OH

Answer

H2CO3 : Weak Acid
HCIO4: Strong Acid
NaCIO4:neither
CH3OH:neither


Question 8
What would happen if a small amount of copper oxide is taken in a beaker and dil. HCI is added to it?
Question 9
How does plaster of paris reacts with water? Write down the chemical equation?
Question 10
What is dilute? Why care must be taken while mixing concentrated nitric acid or sulphuric acid with water?
Question 11
Show with the help of an equation show that metal carbonates liberate carbon dioxide on reaction with dilute acid.
Question 12
Write the balanced molecular equations showing the complete neutralizations of the following.
HNO3 by NaOH
Ca(OH)2 by HI
HNO3 by KOH

Answer

HNO3 + NaOH -> NaNO3 + H2O
Ca(OH)2 + 2HI -> CaI2+2H2O
HNO3 b+ KOH ->KNO3 + H2O



Question 13
Write the formulas of the acid and the base that formed the following salts.
CH3COONa
CuSO4
KClO3
Al2(SO4)3
NH4Cl
Ba(NO2)
NH4NO3

Answer

CH3COONa: CH3COOH and NaOH

CuSO4 : H2SO4 and Cu(OH)2
KClO3: HClO3 and KOH

Al2(SO4)3 : Al(OH)3 and H2SO4
NH4Cl: NH4OH and HCL
Ba(NO2): Ba(OH)2 and HNO2
NH4NO3: NH3 and HNO3


Question 14
Write two observations you would make when quicklime is added to water.
Question 15
What are the uses of Bleaching powder?

Answer

(i) It is used for bleaching cotton and linen in the textile industry, for bleaching wood pulp in paper factories and for bleaching washed clothes in laundry
(ii) It is used as an oxidising agent in many chemical industries
(iii) It is used for disinfecting drinking water to make it free of germs


Question 16
State the chemical property in each case on which the following uses of baking soda are based :-
as an antacid
as a constituent of baking powder.
Question 17
How is plaster of Paris obtained? What reaction is involved in the setting of a paste of plaster of Paris?
Question 18
Acids show their properties only in the presence of water? explain?
Question 19
A weak acid is added to a concentrated solution of hydrochloric acid. Does the solution become more or less acidic?
Question 20
Write the chemical name and formula of washing soda. What happens when crystals of washing soda are exposed to air?

Answer

Na2CO3.10H2O


Question 21
(a)Write word equations and then balanced equations for the reaction taking place when
(i)Dilute sulphuric acid reacts with zinc granules.
(ii)Dilute hydrochloric acid reacts with magnesium ribbon.Give two important uses of caustic soda and baking soda.
(b)On which factors does the strength of an acid or a base depend? Explain.
Question 22
Explain the following by giving examples:
a. how metal oxides react with acids?
b.How non- metal oxides react with baes?
Question 23
(a)Why does acidic solution conduct electricity?
(b)Can basic solution conduct electricity?
(c)Can separation of H+ ions in acids take place when HCI is added to a non- aqueous solution?

Answer

Both acidic and basic solutions in water conduct electricity. Acids, when dissolved in water release the H+ and bases when dissolved in water release the OH- ions. These ions are charged species and so act as charge carriers. In other words the conductivity of these solutions is due to the movement of these ions.



Long Answer type


Question 1
How common salt prepared from sea water?

Answer

Sea water contains a large amount of common salt and the salts of other metals dissolved in it. Near the sea-shore, the sea water is collected in shallow pits and allowed to evaporate in sunshine. In a few days, the water evaporates, leaving behind salt. The salt so obtained is collected and transported to big factories, where it is purified and packed for consumptions


Question 2
What is observed when
(i) dilute sulphuric acid is added to solid sodium carbonate.
(ii) hot concentrated sulphuric acid is added to sulphur.
(iii) Sulphur dioxide is passed through lime water?
Also write chemical equations to represent the chemical reaction taking place in each case.
Question 3
A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test tube. The evolved gas was then passed through lime water. What change would be observed in lime water? What will happen if excess of gas is passed through lime water? Write balanced chemical equations for all the changes observed.
Question 4
A compound X of sodium forms a white powder. It is a constituent of baking powder and is used in some antacid prescriptions. When heated, X gives out a gas and steam. The gas forms a white precipitate with lime water. Write the chemical formula and name of X and the chemical equation for its decomposition on heating. What is its role in baking powder and in antacids?

Answer

Baking powder consists of sodium bicarbonate, tartaric acid and small amount of starch. Hence, the compound X of sodium in question which is a constituent of baking powder and is used in antacids is sodium bicarbonate or sodium hydrogen carbonate, which has the chemical formula NaHCO3. It is commonly known as baking soda.

On heating, it decomposes to give sodium carbonate, water and carbon dioxide.
NaHCO3 -> Na2CO3 + H2O +CO2

This gas(CO2) when passed through lime water turns it milky due to the formation of calcium carbonate, which is insoluble in water.
Ca(OH)2 + CO2 ? CaCO3 + H2O


Question 5
A milk man adds a very small amount of baking soda to fresh milk:
  • Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
  • What do you expect to observe when fresh milk comes to boil?
  • Why does this milk take a long time to set as a curd?

Answer

So that it does not set as curd easily
Since Milk is alkaline in nature,acid produced are neutralized by the base ,so it takes longer time to set into curd


Question 6
With the help of activity show that mixing of acid in water is an exothermic process.
Question 7
Account for the following:
  • Dry HCl gas does not change the colour of dry litmus paper.
  • Antacid tablets are used by a person suffering from stomach pain.
  • Toothpaste is used for cleaning teeth.

Answer

(i)The colour of litmus paper changes only in the presence of ions like hydrogen (H+) or hydronium (H3O+) ions. HCl can produce these ions only in the form of aqueous solution. Hence dry HCl gas does not change the colour of dry litmus paper

(ii)Antacid reacts with acid in the stomach and neutralizes it


Question 8
(a)What is pH scale and what’s its range? How is it related to hydronium ion concentration?
(b)Explain any two roles played  by pH levels of various chemicals in living organisms.

Answer

The term "pH" is defined as the negative logarithm of H+ ion concentration of a given solution; the concentration being expressed as moles per litre.

Mathematically pH = � log [H+] �pH� stands for: Power of hydrogen ion concentration, �p� for power and �H� for H+ ion concentration.

Some important benchmark values in the pH scale are: pH = 7 indicates neutral solutions e.g., aqueous solutions. pH > 7 to 14 indicates alkaline solutions and pH < 7 to 0 indicate acidic solutions


Summary

This Class 10 Science Acid base and Salts Practice test Paper with answers is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.



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