Q:

Which one of the following statements is correct?

A) The oxidation number for hydrogen is always zero.	B) The oxidation number for hydrogen is always + 1.
C) The oxidation number for hydrogen is always -1.	D) Hydrogen can have more than one oxidation number.

Answer & Explanation Answer: D) Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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Q:

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because ________

A) Mercury is a metal	B) Density of mercury is greater than that of water
C) Cohesion of mercury is greater than its adhesion with glass	D) Cohesion of water is greater than its adhesion with glass

Answer & Explanation Answer: C) Cohesion of mercury is greater than its adhesion with glass

Explanation:

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Q:

Which of the following gases is produced due to incomplete combustion of fuel?

A) Carbon Dioxide	B) Carbon Monoxide
C) Methane	D) Ethane

Answer & Explanation Answer: B) Carbon Monoxide

Explanation:

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Q:

In which market form, a market or an industry is dominated by a single seller?

A) Oligopoly	B) Monopoly
C) Duopoly	D) Monopolistic Competition

Answer & Explanation Answer: B) Monopoly

Explanation:

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Q:

Find arc elasticity of demand, if quantity demanded falls from 4600 to 4200 when price of the item is increased from Rs 960 to Rs 1000?

A) -2.23	B) -2.09
C) 2.23	D) 2.09

Answer & Explanation Answer: A) -2.23

Explanation:

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Q:

"Residex Index" is associated with which of these?

A) Share Prices	B) Mutual Fund Prices
C) Price Inflation Index	D) Housing Prices

Answer & Explanation Answer: D) Housing Prices

Explanation:

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Q:

The chemical properties of an element depend upon

A) the number of isotopes of the element	B) the mass number of the element
C) the total number of neutrons in the element	D) the number of electrons in the outermost shell of the element

Answer & Explanation Answer: D) the number of electrons in the outermost shell of the element

Explanation:

Chemical properties of an element depend on the number and the configuration of their (valence) electrons.

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Q:

Which of the following statements is INCORRECT?

A) Solids have definite volume	B) solids are rigid
C) Solids have indefinite shape	D) Solids are almost incompressible

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