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 Chemistry Questions

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Q:

Which of the following is not a semiconductor?

A) CdS B) NaCl
C) Si D) Ge
 
Answer & Explanation Answer: B) NaCl

Explanation:

Semiconductors are those materials that are neither good conductors nor the good insulators of heat and electricity. Silicon (Si), Germanium (Ge) and Cadmium Sulphide (CdS) are semiconductors which work as conductors in some special conditions only.

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Q:

A change in which a substance undergoes a change in its physical properties is called _____________.

A) Chemical Properties B) Physical Properties
C) Chemical Change D) Physical Change
 
Answer & Explanation Answer: D) Physical Change

Explanation:
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Q:

The common name of sulphur is

A) Freon B) galena
C) lime D) brimstone
 
Answer & Explanation Answer: D) brimstone

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Q:

Which of the following is not soluble in water?

A) Lead sulphate B) Zinc sulphate
C) Potassium sulphate D) Sodium sulphate
 
Answer & Explanation Answer: A) Lead sulphate

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Q:

Which of the following gas was released during Bhopal gas tragedy?

A) Methyl isocyanate B) Sodium isothiocyanate
C) Nitrogen isothiocyanate D) Potassium isothiocyanate
 
Answer & Explanation Answer: A) Methyl isocyanate

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Q:

Which of the following elements has the lowest melting point?

A) Xenon B) Iodine
C) Barium D) Magnesium
 
Answer & Explanation Answer: A) Xenon

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Q:

The main mineral constituents of the continental mass are ________ and alumina.

A) iron oxide B) silica
C) water D) oxygen
 
Answer & Explanation Answer: B) silica

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Q:

The biogas used for cooking is a mixture of which of the following ?

A) Carbon dioxide & oxygen B) Isobutane & propane
C) Methane & carbon monoxide D) Methane & carbon dioxide
 
Answer & Explanation Answer: D) Methane & carbon dioxide

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