Chapter 5 : Acid base and salt
Time : 30 min
Date : 09.02.2020
Maximum marks: 50
1. The equation for the reaction taking place in the titration is shown.
HNO3 + KOH → KNO3 + H2O
Explain this reaction
.................................................................................................................................................(2)
2. Copper (II) sulfate can be prepared by heating an excess of copper(II) oxide with dilute
sulfuric acid.
(i) Complete the chemical equation for this reaction.
CuO + 2HNO3→ ……………. + .....................
(ii) What method is used to separate the excess copper(II) oxide from the solution?
.......................................................................................................................................
Copper (II) oxide can be reduced by hydrogen.
CuO + H2→ Cu + H2O
How does this equation show that copper(II) oxide is reduced?
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The chemical equation for the reaction of copper with concentrated nitric acid is shown.
Cu + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O
Complete the word equation for this reaction.
copper + nitricacid
→ ...............+ ..............+ ...............
(8)
3. .Copper(II) nitrate can be made by reacting copper(II) carbonate with nitric acid. One of
the products is carbon dioxide.
(i) Write a chemical equation for the reaction of copper(II) carbonate with nitric acid.
..................................................................................................................................(2).
(ii) Carbon dioxide is added to the air by living things.
Name the chemical process by which living things add carbon dioxide to the air.
........................................................................................................................................
(iii) Carbon dioxide is removed from the air by plants.
Name the chemical process by which plants remove carbon dioxide from the air.
.......................................................................................................................................(2).
4. Write the formula of
Hydrated cobalt chloride………………………………….
Hydrated iron sulphate …………………………………….. (2)
5. Give one reaction of acid react with alkali give salt and water.
…………………………………………………………………………………………………
…………………………………………………………………………………(2)
6. Give explanation about the treatment of acidity by liming process.
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………(1)
7. Milk of magnesia react with our stomach acid gives salt, water and carbon dioxide
MgCO3 - milk of magnesia
HCl
- stomach acid
…………………………………………………………………………………………………
…………………………………………………………………………………(2)
8. Write two common ingredients of antacids.
…………………………………………………………………………………………………
………………………………………………………………………………….(2)
9.An oxide is a compound of an element with oxygen. Choose the answer and write it.
Example: CO2 SO2 MgO, ZnO, BaO, No2
Metal oxides ………………………………………………
Non metal oxides …………………………………………(2)
10. Parent acid of sodium carbonate………………………….
Parent acid of potassium sulphate………………….........
Parent acid of magnesium chloride……………………….(3)
11. Which extinguisher is an universal extinguisher and why?
…………………………………………………………………………………………………
…………………………………………………………………………………………….(2)
12. What is the formula of sulfamic acid? What is it used for?
…………………………………………………………………………………………………
………………………………………………………………………………..(2)
13. All salts are ionic compounds. Salts are produced when an alkali neutralises
an……………. In this reaction, the salt is formed when a ………………………ion or an
ammonium ion from the alkali replaces one or more ………………ions of the acid. All
………………. Salts are soluble in water. Insoluble salts are prepared
by……………………..
(5)
[ sodium, hydrogen, acid, precipitation, metallic]
14. Give some examples of
Monobasic ………………………………
Dibasic………………………………………
Tribasic………………………………………
(3)
15. Iron(III) chromate is a yellow solid. It contains the ions Fe3+ and CrO42–.
What is the formula of iron(III) chromate?
a. FeCrO4
b. Fe3(CrO4)2
c. Fe2CrO4
d. Fe2(CrO4)3
16. Aqueous sodium hydroxide is added to solid Q in a test-tube.
A gas is produced which turns damp red litmus blue.
What is Q?
a. aluminium
b. ammonia
c. ammonium chloride
d. sodium nitrate
17. Potassium hydroxide is a base.
Which statement describes a reaction of potassium hydroxide?
a. Chlorine is formed when it is heated with ammonium chloride.
b. It turns Universal Indicator green.
c. It reacts with an acid to produce a salt and water.
d. It turns methyl orange red.
18. A student heats hydrated copper(II) sulfate. The blue crystals change to a white powder.
How can the student reverse this reaction?
a. Add anhydrous copper(II) sulfate to the white powder.
b. Add water to the white powder.
c. Cool the white powder.
d. Reheat the white powder.
(4)
19.Name the acid of the following compounds:
a. Vinegar
……………………………………..
b. Lemon
…………………………………….
c. Stomach acid
…………………………………………
d. Soft drinks
……………………………………… (4)
[ carbonic acid, hydrochloric acid, acetic acid, citric acid]
20.Give the reaction of acid with metal carbonate to give salt, water and carbon dioxide.
…………………………………………………………………………………………………
…………………………………………………………………………………(2)