16
Q:

Which of the following is not a subatomic particle?

A) neutron B) ion
C) electron D) proton

Answer:   B) ion



Explanation:

The particles which makes upon an atom are called subatomic particles. Electrons, protons and Neutrons that makes an atom are called subatomic particles.

Whereas,

An ion is an atom or group of atoms in which the number of electrons is different from the number of protons.

Subject: Chemistry
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Q:

Which is the most economical method of removing solid matter from water?

A) Using deactivated carbon B) Electrolysis
C) Distillation D) Sedimentation
 
Answer & Explanation Answer: D) Sedimentation

Explanation:
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Q:

Which of the following elements has the lowest melting point?

A) Chromium B) Hydrogen
C) Zinc D) Silver
 
Answer & Explanation Answer: B) Hydrogen

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Q:

NaHCO3 is chemical formula for ___________.

A) Borax B) Vinegar
C) Lime D) Baking soda
 
Answer & Explanation Answer: D) Baking soda

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Q:

A change in which no new substances are formed is called _____________.

A) Physical Change B) Chemical Change
C) Rusting D) Galvanisation
 
Answer & Explanation Answer: A) Physical Change

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Q:

Which of the following is the best fire-extinguisher?

A) Water B) Oxygen
C) Carbon-dioxide D) Soil
 
Answer & Explanation Answer: C) Carbon-dioxide

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Q:

Which of the following statements are CORRECT?

I. Melamine is a Thermo setting plastic.

II. It resists fire.

III It is a poor conductor of heat.

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: D) All I, II and III

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Q:

Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?

A) N2O B) AsH3
C) N2 D) C5H12
 
Answer & Explanation Answer: A) N2O

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Q:

The common name of dichlorodifluoromethane is _____.

A) galena B) Freon
C) gypsum D) borax
 
Answer & Explanation Answer: B) Freon

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