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 Chemistry Questions

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Q:

What relationship exists between an enzyme and a catalyst?

Answer

An enzyme is a variety of catalyst and is the relation between tham. A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction.


 

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Q:

Adding which substance gives blue colour to glass?

A) Manganese oxide B) Cobalt oxide
C) Chromium oxide D) Iron oxide
 
Answer & Explanation Answer: B) Cobalt oxide

Explanation:
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Q:

Group 7A of the periodic table contains the

A) most reactive metals B) least reactive non metals
C) most reactive non metals D) least reactive metals
 
Answer & Explanation Answer: C) most reactive non metals

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Q:

What is the product formed when sodium bicarbonate is heated strongly?

A) Sodium Carbonate B) Sodium Hydroxide
C) Sodium Peroxide D) Sodium Monoxide
 
Answer & Explanation Answer: A) Sodium Carbonate

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Q:

The principal quantum number indicates what property of an electron?

A) energy of electron B) distance of electron from nucleus
C) both a & b D) number of subshells
 
Answer & Explanation Answer: C) both a & b

Explanation:

The principal quantum number is the property of an electron which determines the energy of electron and the distance of electron from the nucleus of an atom.

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Q:

Decane has how many hydrogen atoms?

A) 22 B) 24
C) 11 D) 33
 
Answer & Explanation Answer: A) 22

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Q:

What is the chemical formula of aluminium nitride?

A) AlN B) Al2N
C) AlN2 D) AlN3
 
Answer & Explanation Answer: A) AlN

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Q:

During which change is energy absorbed?

A) Exothermic B) Endothermic
C) Both A & B D) Neither A nor B
 
Answer & Explanation Answer: B) Endothermic

Explanation:

Endothermic reaction is the reaction in which energy is obserbed for the change.

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