Chemistry SECTION- G

1.       The pure form of carbon is

(a)    Diamond

(b)   Graphite

(c)    Charcoal

(d)   Fullerene

2.       Salts of which of the following elements provide colour to fireworks?

(a)    Zinc and sulphur

(b)   Potassium and mercury

(c)    Strontium and barium

(d)   Chromium and nickel

3.       Match the following.

List I (Fuel Gas)	List II (Major Constituent)
A.      CNG        B.      Coal gas        C.      LPG        D.      Water gas	1.       Carbon monoxide , hydrogen 2.       Butane, propane 3.       Methane, propane 4.       Hydrogen , methane, carbon monoxide

Codes

                                   A    B    C    D

(a)     2    1    3     4

(b)   3     4    2     1

(c)    2     4    3     1

(d)   3     1    2     4

           4.       Which one of the following fertilizers has more nitrogen content?

(a)    Urea   (b) Ammonium nitrate  (c) potassium nitrate  (d)  ammonium phosphate

           5.       Consider the following statements about glass

1.       Glass is a supercooled liquid having infinite viscosity.

2.       Violet coloured glass is obtained by adding MnO₂.

3.       Glass is a man-made silicate.

4.       Glass is a crystalline substance.

Which of the statements given above is / are correct?

(a)    1,  2 and 4

(b)   2,  3  and 4

(c)    1,  2 and 3 

(d)   1  and 3

           6.       Bronze is often used to make statues and medals whereas brass is used in making utensils, scientific apparatus and cartridges. Both brass and bronze are copper containing alloys, yet they differ in their chemical composition for additionally containing.

(a)    Zinc in brass and tin in bronze

(b)   Chromium in brass and nickel in bronze

(c)    Nickel in bras and tin in bronze

(d)   Iron in brass and nickel in bronze

             7.       Which one of the following metals has the highest density?

(a)    Gold   (b) Iron   (c)  platinum  (d) Lead

             8.       Which of the following does not contain silver?

(a)    Horn silver  (b)  German silver  (c) ruby silver  (d)  Lunar caustic

             9.       Neutral water with pH about 7 become slightly acidic when aerated. this is because

(A)   Oxygen from air is dissolved in the water which makes the water acidic

(B)   Dirt, which get contaminated with the water makes the water acidic

(C)   Ultraviolet radiation dissociates water molecules and makes water acidic

(D)   Carbon dioxide from air is dissolved

              10.       Silicon carbide (SIC) is known as

(a)    Quartz   (b) tridynite (c) corundum   (d)  carborundum  

Answer:

1.       A

2.       C

3.       B

4.       A

5.       C

6.       A

7.       C

8.       B

9.       D

10.   C