Chemistry Test 5

Total Questions: 14

1 - Permanent hardness of water can be removed by adding:
A ) Potassium permanganate
B ) Chlorine
C ) Bleaching powder
D ) Washing soda ✅

2 - The first synthetic fiber made by man was:
A ) Rayon
B ) Nylon ✅
C ) Polyester
D ) Terrycott

3 - Gypsum is added to comment clinker to:
A ) Increase the tensile strength of cement
B ) Bind the particles of calcium silicate
C ) Decrease the rate of setting of cement ✅
D ) Facilitate the formation of colloidal gel

4 - Production of chlorofluorocarbons (CFC) gas is used in which of the following domestic products?
A ) Television
B ) Tube light
C ) Cooking gas
D ) Refrigerator ✅

5 - In fireworks, the green flame is produced because of:
A ) Mercury
B ) Sodium
C ) Potassium
D ) Barium ✅

6 - Mixture of two metals is called

A ) Dispersion
B ) Alloy ✅
C ) Mouse
D ) Hard Drive

7 - Dynamite was discovered by
A ) Daimler
B ) Mosely
C ) Alfred Nobel ✅
D ) Freud

8 - What is the chemical combination of laughing gas?
A ) Helium and Nitrogen
B ) Nitrogen and Hydrogen
C ) Nitrogen and Oxygen ✅
D ) Hydrogen and Oxygen

9 - Which of the following is the lightest element of the periodic table?
A ) Nitrogen
B ) Carbon dioxide
C ) Hydrogen ✅
D ) Oxygen

10 - Mixing of which material makes rubber more flexible?
A ) Graphite
B ) Marble powder
C ) Sulphur ✅
D ) Potassium permanganate

11 - Which is the smallest unit of protein?
A ) Fatty acid
B ) Glycerol
C ) Amino Acid ✅
D ) Calcium

12 - When heavy and unstable elements split into relatively smaller elements with the release of energy the process is called

A ) Fission ✅
B ) Fusion
C ) Diffusion
D ) Infusion

13 - Name the element which is common to all acids?
A ) Oxalic
B ) Hydrogen ✅
C ) Carbolic
D ) Sulphuric

14 - What is laughing gas called?
A ) Ferrous chloride
B ) Sulphur dioxide
C ) Ferric hydroxide
D ) Nitrous Oxide ✅
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