Chemistry Questions

Q:

The nitrogen atom has 7 protons and 7 electrons,The nitride ion will have

A) 10 protons and 7 electrons B) 7 protons and 10 electrons
C) 4 protons and 7 electrons D) 4 protons and 10 electrons
 
Answer & Explanation Answer: B) 7 protons and 10 electrons

Explanation:
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Q:

The isotopes of chlorine with mass number 35 and 37 exist in the ratio of

A) 1:2 B) 2:3
C) 3:1 D) 3:4
 
Answer & Explanation Answer: C) 3:1

Explanation:
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Q:

A radioactive substance has a half life of four months, three-fourth of the substance would decay in

A) 3 months B) 4 months
C) 8 months D) 12 months
 
Answer & Explanation Answer: C) 8 months

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Q:

Which one of the following elements is the poorest conductor of heat

A) sodium B) lead
C) zinc D) mercury
 
Answer & Explanation Answer: B) lead

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Q:

What is the simplest form of matter?

A) Element B) Molecule
C) Atom D) Compound
 
Answer & Explanation Answer: A) Element

Explanation:

The simplest form of matter that has a unique set of properties and is cannot be broken down into simpler substances by chemical means is called an Element.

 

An Atom is the simplest form of an element.

The simplest form of some elements is a Molecule. When an element consists of two identical atoms it is called a diatomic molecule.

A substance that contains two or more elements chemically combined in a fixed proportion is called a Compound.

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Q:

Which is the gas used for making vegetables and vanaspathi from vegetable oils?

A) Hydrogen B) Nitrogen
C) Argon D) Helium
 
Answer & Explanation Answer: A) Hydrogen

Explanation:

Hydrogen gas is used for making vegetables and vanaspathi from vegetable oils.

As it is colourless, odourless, tasteless, flammable gaseous substance, it is added to oils to make them more solid or spreadable.

The use of hydrogenation helps to prolong the shelf life of the food and maintain flavour stability.

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Q:

Natural Rubber is a Polymer of

A) butadiene B) 2methyl-1,3butadiene
C) ethylene D) isoprene
 
Answer & Explanation Answer: D) isoprene

Explanation:

Natural Rubber is a Polymer derived from Isoprene. 

 rubber-bands-503028_6401547100511.jpg image

      • Natural rubber is an addition polymer that is obtained as a milky white fluid known as Latex from a Tropical Rubber Tree.
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Q:

In nuclear reactor,Chain reaction is controlled by introducing

A) cadmium rod B) iron rod
C) platinum rod D) graphite rod
 
Answer & Explanation Answer: A) cadmium rod

Explanation:
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