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 Chemistry Questions

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Q:

Which one of the following is an ohmic conductor?

A) Germanium B) Silicon
C) Carbon D) Silver
 
Answer & Explanation Answer: D) Silver

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Q:

Which of the following is applied on the top of the matchsticks?

A) Red phosphorus B) White phosphorus
C) Potassium sulphate D) No option is correct
 
Answer & Explanation Answer: A) Red phosphorus

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Q:

Bauxite is an ore/mineral of

A) Aluminium B) Beryllium
C) Lead D) Tin
 
Answer & Explanation Answer: A) Aluminium

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Q:

........... compound is used as a drying agent.

A) Calcium oxide B) Calcium carbide
C) Gypsum D) Calcium carbonate
 
Answer & Explanation Answer: A) Calcium oxide

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Q:

Which method will be employed to test the hardness of water?

A) Boiling B) Distillation
C) Formation of lather with soap D) None of these
 
Answer & Explanation Answer: C) Formation of lather with soap

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Q:

Which   one   of   the   following   is   not   a semiconductor?

A) Silicon B) Germanium
C) Quartz D) Gallium arsenide
 
Answer & Explanation Answer: C) Quartz

Explanation:

Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc. 2. Lattice structure and the atomic structure of constituent elements decide whether a particular material will be insulator, metal or semiconductor. Semiconductors are elemental (Si, Ge) as well as compound (GaAs, CdS, etc.). Silicon, Germanium, Gallium Arsenide are semiconductors, but Quartz is an insulator.

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Q:

Activated Charcoal is used to remove colouring matter from pure substances by_______

A) Bleaching B) Oxidation
C) Adsorption D) Reduction
 
Answer & Explanation Answer: C) Adsorption

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4 1768
Q:

The volume of 10 g of gas X is 5.6 litre at NTP. What is the molecular weight of X?

A) 40 B) 60
C) 50 D) 20
 
Answer & Explanation Answer: A) 40

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