Chemistry - Mock Test 39

Question 381

Which one of the following elements is the poorest conductor of heat?

A) zinc B) sodium C) lead D) mercury

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Question 382

The isotopes of chlorine with mass number 35 and 37 exist in the ratio of?

A) 1:2 B) 3:1 C) 3:4 D) 2:3

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Question 383

The electrochemical cell stops working after some time because ________?

A) Electrode potential of both the electrodes becomes zero B) One of electrodes completely vanishes C) Electrode potential of both electrodes equalizes D) The reaction reverses its direction

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Question 384

Which one of the following substances does not have a melting point?

A) mercury B) glass C) sodium chloride D) bromine

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Question 385

Which one of the following mixture is homogeneous?

A) graphite and charcoal B) methanol and water C) calcium carbonate and calcium bicarbonate D) starch and sugar

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Question 386

The discovery of neutron became very late because?

A) it does not move B) it is present in nucleus C) it is a fundamental particle D) it does not carry any charge

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Question 387

Which one is not metal?

A) sulpher B) sugar C) nitrogen D) all of these

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Question 388

When formaldehyde and potassium hydroxide are heated , we get?

A) Methane B) Methyl alcohol C) Acetylene D) Ethyl formate

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Question 389

Which one of the following is not a mixture?

A) milk B) mercury C) cementair D) air

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Question 390

Cobalt60 is commonly used in radiation therapy because it emits?

A) alpha - rays B) X - rays C) beta rays D) gamma rays

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