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More Practice questions
Name four gases that can be prepared in the laboratory using dilute H2SO4. Show how they can be prepared? Solution
The four gases are:
1) H2 gas : An active metal (above Pb) and dilute H2SO4 gives H2 gas
2) CO2 gas :Any carbonate salt and dilute H2SO4 gives CO2 gas
3) SO2 gas :Any sulphite salt and dilute H2SO4 gives SO2 gas
4) H2S gas : Any sulphide salt and dilute H2SO4 gives H2S gas.
A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd? Solution
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 4 Fill in the blanks.
(a) Chemical formula for bleaching powder is ______.
(b) Acids ______ _______ bases to form ________ and water.
(c) The term pH was coined by _______ .
(d) An acidic solution contains _____ _______ ions .
(e)________ ________ is used in softening water.
(f) ______ medicine used to treat indigestion
(g) Calcium Sulphate hemihydrate is popularly known as _____ ___ _____.
(i) ________ are present in aerated drinks Solution
b)React, with. salt
g) Plaster of Paris
Common Salt :NaCl Backing soda: NaHCO3 Caustic soda:NaOH Washing Soda:Na2CO3
Question 6 True and False statement
a) Vinegar contains acetic acid
b) Formic acid is a weak acid
c) Acids gives H+ ion in water
d) Baking soda is used for Softening of hard water
e) pH of a solution can vary from 0-14.
f) Heat is evolved during ionization.
g) NaCl is a base
h) Acids turns blue litmus solution to red Solution
Short answer type questions
a) What is lime water?
b) How plaster of paris is formed?
c) What is the pH of our stomach
d) Name a strong base and a weak base.
e) Name a hydrated salt
f) What is a universal indicator? What is its advantage? Solution
a) Limewater is the common name for a diluted solution of calcium hydroxide
d)Strong Base is NaOH and Weak Base is NH4OH
e) A hydrated salt is copper sulphate crystals (CuSO4.5H2O).
f) A universal indicator is a mixed indicator of organic chemicals which not only shows whether the given solution is acidic or basic, but also shows the approximate pH values by giving a wide particular colour for a specific value of pH.