Class 10 Acid base and Salts Important questions-6

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1.When a solution of an acid contains larger amount of acid, it is said to be-
(c) concentrated                   
(d) polybasic

2. Metals like sodium, potassium and calcium react with an acid to liberate-
c) NH3                            

3.Bleaching powder is soluble in cold water giving a milky solution due to –
a)Available chlorine
b)Lime present in it
c)Calcium carbonat formation
d)The absorption of carbon dioxide from atmosphere

4. Which substance is used to purify water—
a)Ammonium chloride                       
b) copper sulphate
c) chlorine                                        
d) none of these

5.A blue litmus paper was first dipped in dil. HCI and then in dil. NaOH solution. It was observed that the color of the litmus paper –
a)Changed to red
b)Changed first to red and then to blue
c)Changed blue to colorless
d)Remains blue in both the solutions

6.The acid used in making of vinegar is :-
a)Formic acid
b)Acetic acid
c)Sulphuric acid
d)Nitric acid

7. A solution turns blue litmus red. The PH of the solution is probably---
(b) 10
(c) 12                                               
(d) 4

8.Reaction of an acid with a base is known as –
c)redox reaction

9.The aqueous solution of sodium acetate is---
(b) neutral
(c) acidic                                       
(d) none of these

10.Antacids contains –
a)weak base
b)weak acid
c)strong base
d)strong acid

11.Bleaching powder gives smell of chlorine because
a)is unstable
b)gives chlorine on exposure to atmosphere
c)is a mixture of chlorine and slaked lime
d)contains excess of chlorine

12.Plaster of paris is made from
a)lime stone
b)slaked lime
c)quick lime

13.The example of olfactory indicators is
(a)Methyle orange                            
(b) onion
(c) blue litmus                                
(d) phenolphthalein

14.Chemical formula of baking soda is –
a) MgSO4
b) Na2CO3
c) NaHCO3
d) MgCO3

15.When we heat the carbonates of some metals, we get
(b) H2
(c) CO2                                           
(d) NO2

16.Plaster of Paris hardens by –
a)giving of CO2
b)changing into CaCO3
c)combining with water
d)giving out water

17.Which of the following is acidic in nature –
a)apple juice
b)soap solution
c)slaked lime

18.Which of the following acid is present in sour milk ?
a)glycolic acid
b)lactic acid
c)citrus acid
d)tartaric acid
19. Milk of magnesium is an example of
(b) acid
(c) salt                                            
(d) none of these

20.A solution react with crushed egg- shells to give a gas that turns lime- water milky. The solution contains –

21. Which of the following is the weak acid
(a) sulphuric acid                         
(b) hydrochloric acid
(c) acetic acid                            
(d) nitric acid

22.Acidity of ammonium hydroxide is

23.Which of the following is not an acidic salt
24.Basic salts are formed by neutralization of
a)strong acid and strong base
b)strong acid and weak base
c)weak acid and weak base
d)strong base and weak acid

25.Plaster of paris is obtained –\
a)by adding water to calcium sulphate
b)by adding sulphuric acid to calcium hydroxide
c)by heating gypsum to a very high temperature
d)by heating gypsum to 373 K.

1 b 2 d 3 b 4 c 5 b
6 b 7 d 8 d 9 a 10 a
11 b 12 d 13 b 14 c 15 c
16 c 17 a 18 b 19 a 20 b
21 c 22 a 23 b 24 d 25 d


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