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 Chemistry Questions

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Q:

_______ is an anaesthetic agent.

A) Acetylene B) Glycol
C) Diethylether D) Ethylene
 
Answer & Explanation Answer: C) Diethylether

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Q:

Methane an air pollutant is produced ______.

A) by action of ultraviolet light on nitrogenous compounds. B) as a by-product of manufacturing ammoniacal fertilizers
C) by burning of coal in insufficient air D) by digestion of food by animals
 
Answer & Explanation Answer: D) by digestion of food by animals

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Q:

Which of the following is essential for the synthesis of thyroxin?

A) Potassium B) Calcium
C) Iodine D) Sodium
 
Answer & Explanation Answer: C) Iodine

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Q:

There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as

A) isotones B) isochores
C) isobars D) isotopes
 
Answer & Explanation Answer: C) isobars

Explanation:

Isotopes-These  are  atoms  of  the elements  having  the  same  atomic number but different mass number.,  Isobars-These  are atoms of same mass number but different atomic  number.,  Isotones-These are  atoms  of  different  elements having same number of neutrons.

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Q:

Which gas contributes most to the Greenhouse effect?

A) Water vapour B) Ozone
C) Oxygen D) Nitrogen
 
Answer & Explanation Answer: A) Water vapour

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Q:

Which of the following has pH value 7?

A) Pure Water B) H2SO4
C) Sodium Carbonate D) HCl
 
Answer & Explanation Answer: A) Pure Water

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Q:

_______________ is the movement of molecules across a cell membrane from a region of their lower concentration to a region of their higher concentration.

A) Diffusion B) Osmosis
C) Active Transport D) Passive Transport
 
Answer & Explanation Answer: C) Active Transport

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Q:

In the reaction H2O2 + Cl2 -----> 2HCl + O2, H2O2 acts as

A) an acid B) an oxidising agent
C) a reducing agent D) a base
 
Answer & Explanation Answer: C) a reducing agent

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