Chemistry - General Science MCQs for Competitive Exams | Page-6

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Questions
51 Radioactive disintegration of uranium ultimately results in formation of
A Lead
B Radium
C Thorium
D Polonium

Answer: Option [A]
52 Metal are good conductor because
A The molecules colloid very freely
B They contain reflecting surface
C They contain free electron
D The molecules are very close to each other

Answer: Option [C]
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53 Cloud is a colloidal dispersion of
A Fog in a dispersion medium of water
B Mist in a dispersion medium of air
C Air in a dispersion medium of water
D Water drops in a dispersion medium of air

Answer: Option [D]
54 Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes
A Sodium chloride
B Borax
C Saltpeter
D Hydrogen peroxide

Answer: Option [A]
55 Impure camphor is purified by
A Steam distillation
B Sublimation
C Fractional distillation
D Fractional crystallization

Answer: Option [B]
56 Sour taste of ‘Coca Cola’ is due to the presence of
A Formic acid
B Acetic acid
C Hydrochloric acid
D Phosphoric acid

Answer: Option [D]
57 Which of the following is used to restore the colour of old oil-paintings?
A Ozone
B Hydrogen peroxide
C Sodium peroxide
D Barium peroxide

Answer: Option [B]
58 The cathode of a lead storage battery is made up of
A Lead
B Zinc
C Lead oxide
D Manganese dioxide

Answer: Option [C]
59 Heat resistant variety of glass is
A Flint glass
B Hard glass
C Pyrex glass
D None of these

Answer: Option [A]
60 The substance most commonly used as a food preservation is
A Acetic acid
B Tartaric acid
C Sodium carbonate
D Sodium salt of benzoic acid

Answer: Option [D]

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