Chemistry - Mock Test 33

Question 321

Wavelength of which of the following colours of the visible spectrum of light are maximally absorbed by green plants________?

A) Green and Yellow B) Red and Blue C) Green and Red D) Blue and Yellow

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Question 322

The atoms of the elements which have same number of neutrons are called?

A) Isotones B) Isobars C) Isotopes D) None of these

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Question 323

Alum is used?

A) as an analgesic B) in the purification of water C) as a fertilizer D) as a disinfectant

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Question 324

In addition to nitric acid, another acid which may render iron passive is?

A) chromic acid B) oxalic acid C) acetic acid D) citric acid

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Question 325

Dust particles in the air of large industrial cities are removed by?

A) Sedimentation B) Electrophoresis C) Tyndall effect D) Brownian movement

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Question 326

A mixture of sand and naphthalene can be seperated by __________?

A) Chromatography B) Sublimation C) Fractional distillation D) Any of them

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Question 327

Isotopes of the atoms of same element have?

A) same number of neutrons B) same number of protons C) same atomic mass D) different chemical properties

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Question 328

The function of nitrogen in air is?

A) to make air a moderate supporter of combustion B) to maintain the density of air constant C) to prevent the hydrogen in air from exploding D) to reduce the poisonous nature of ozone in air

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Question 329

Harmful bacteria in drinking water cannot be destroyed by?

A) Chlorination B) boiling C) adding caustic soda D) ozonisation

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Question 330

Acute diabets patients smell of?

A) acetone B) ether C) ethyl alcohol D) methyl alcohol

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