MULTIPLE CHOICE QUESTIONS

MULTIPLE CHOICE QUESTIONS:

1. Which of the following substances will not give carbon dioxide on treatment with dilute acid?
   a) Marble                                                        b) Limestone
   c) Lime                                                            d) Baking soda

 

2. The chemical formula of caustic potash is
3. a) NaOH                                                         b) Ca(OH)₂
4. c) NH₄OH                                                      d) KOH

 

3. An element ‘X’ forms a solid oxide which dissolves in water forming solution which turns blue litmus paper red , ‘X’ is
   a) Ca                                                               b) Cu
   c) Fe                                                               d) P

 

4. The compound used for neutralization of excess HCI in the stomach is
5. a) NaHCO₃                                                            b) Mg(OH)₂
6. c) Both                                                         d) None of these

 

5. A milkman added a small pinch of baking soda to fresh milk which had pH close to 6. As a result , pH of the medium
6. a) Become close to 2                                  b) Become close to 4
7. c) Did not undergo any change               d) Become close to 8

 

6. The substance which on treating with chlorine, yields bleaching powder is
7. a) Quick lime                                               b) Limestone
8. c) Slaked lime                                              d) Gypsum

 

7. The pH of a solution of HCI is 4. This shows that the molarity of the solution is
8. a) 4.0 M                                                       b) 0.4 M
9. c) 0.0001 M                                                d) 0.001 M

 

8. The role of quick lime in soda-lime (mixture) is to
   a) Absorb moisture present in soda lime
   b) Increase the efficiency of soda lime
   c) Absorb carbon dioxide present in soda lime
   d) Take part in reaction with NaOH

 

9. Which of the following statements is correct about an aqueous solution of an acid and of a base?
   (i) Higher the ph, strong the acid               (ii) Higher the ph , weaker the acid
   (iii) Lower the ph , stronger the base         (iv) Lower the ph , weaker the base
   a) (i) and (iii)                          (b) (i) and  (iv)                   (c) (ii) and (iii)                      (d) (ii) and (iv)

 

10. Milk of magnesia is
     (a) Solid magnesium oxide                     (b) Insoluble magnesium hydroxide
    (c) Soluble magnesium hydroxide        (d) Insoluble magnesium carbonate

 

11. An aqueous solution has (H⁺) ion concentration = 1.0 10 ^_7 mol L ^_1 . PH value is
    a) +7                                   b)-7                          c) 0.70                         d) 10 ^_7

 

12. The chemical formula of caustic potash is
13. a) NaOH                b) Ca(OH)₂                 c) NH₄OH                   d) KOH

 

13. Identify the substance, having the property of deliquescence
14. a) Gypsum                                                  b) Hydrated calcium choride  
15. c) Quick lime                                             d) Conc, sulphuric acid

 

14. The composition of aqua regia is
    a) Conc. H₂SO₄ and conc. HCL in ratio of 1 : 3
    b) Conc. HNO₃ and conc HCL in ratio of 1 : 3
    c) Conc. HNO₃ and conc. HCL in ratio of 3 : 1
    d) Conc. H₂SO₄ and conc. HNO₃ is ratio of 3 : 1

 

15. Soda – acid fire extinguishes the fire by
    a) Cutting the supply of air b) Raising ignition temperature
    b) Removing combustible substance d) None of these

 

Answers

1. c)                2.  d)                3.  d)                4.  c)                 5.  d)
6.c)                 7. c)                 8.  a)                9.  d)                10. c)
11.a)              12.  b)              13.  b)              14. b)               15.  a)