Question

Question 1
When a solution of acid contains a larger amount of acid, it is said to be-
(a) Dilute
(b) concentrated
(c) Monobasic
(d) polybasic

Question 2
metals like sodium, potassium and calcium react with an acid to liberate-
(a) CO2
(b) NH3
(c)O2
(d)H2

Question 3
Which of the following is a weak acid?
(a) sulphuric acid
(b) hydrochloric acid
(c) acetic acid
(d) nitric acid

Question 4
The chemical formula of baking soda is
(a)Na2Co3
(b) Na2Co3.10H2O
(c) NaHCO3
(d) NaOH

Question 5
Which of the following phenomena occur, when a small amount of acid is added to water?
(a) ionization
(b) Neutralization
(c) Dilution
( d) Salt formation

Question 6
Salt form during the reaction of sulphuric acid with copper
(a)Na2SO4
(b) CuSO4
(c) K2SO4
(d) NH4CI

Question 7
CuSO4. K2SO4 is
(a)acid salt
(b) a mixed salt
(c) normal salt
(d) double salt

Question 8
The acid present in vinegar
(a)citric acid
(b) tartaric acid
(c) ascorbic acid
(d) acetic acid

Question 9
The acid reacts with---------- of metals to form salt and water.
(a)hydroxide
(b) carbonates
(c) oxides
(d) sulphides

Question 10
Which of these bases is not an alkali?
(a)NaOH
(b) NH4OH
(c) AI (OH)3
(d) all of the are alkalies

Answer 1

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1. Concentrated
2. H2
3. Acetic acid
4. NaHCO3
5. Dilution
6. CuSO4
7. Normal salt
8. Acetic acid
9. Hydroxide
10. NH4OH

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Answer 2

Solution:

1. When a solution of acid contains a larger amount of acid, it is said to be concentrated.

• Concentrated acid solution has high amount of acid present in less amount of water.

2. Metals like sodium, potassium and calcium react with an acid to liberate Hydrogen gas $(H_2)$.

$2Na + 2HCl \rightarrow 2NaCl +H_2 \uparrow$

3. Acetic acid is a weak acid.

Acetic acid partially dissociates in water. Hence, it is a weak acid.

4. Baking soda is Sodium hydrogen bicarbonate. It's chemical formula is $NaHCO_3$

5. When a small amount of acid is added to water then Dilution of acid occurs.

6. When Sulphuric acid reacts with Copper then Copper sulphate $(CuSO_4)$ forms.

$Cu + H_2SO_4 \rightarrow CuSO_4 +H_2\uparrow$

7. $CuSO_4.K_2SO_4$ is a double salt.

• A double salt is a crystalline salt having the composition of a mixture of two simple salts but with a different crystal structure from either.

8. In vinegar, acetic acid is present.

9. The acids react with hydroxides of metals to form salt and water.

10. $Al(OH)_3$ is not an alkali.