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 Chemistry Questions

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Q:

What is the heaviest noble gas?

A) krypton B) radon
C) helium D) xenon
 
Answer & Explanation Answer: B) radon

Explanation:

The seven elements — helium, neon, argon, krypton, xenon, radon, and oganesson of Group 18 of the periodic table are Noble or Inert gases.

 

Radon is the heaviest and Helium is the lightest gases of the noble gases.

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Q:

_______contributes towards global warming so it is called a greenhouse gas.

 

A) Oxygen B) Nitrogen
C) Hydrogen D) Methane
 
Answer & Explanation Answer: D) Methane

Explanation:
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Q:

What is the general formula of alkenes?

 

A) CnH2n B) CnH2n+2
C) CnH2n-2 D) CnH2n-1
 
Answer & Explanation Answer: A) CnH2n

Explanation:
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Q:

An alloy is

A) a compound B) an allotropic form
C) an isomer D) a mixture
 
Answer & Explanation Answer: D) a mixture

Explanation:
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Q:

What element behaves most like magnesium?

A) Silicon B) Strontium
C) Sulphur D) Tin
 
Answer & Explanation Answer: B) Strontium

Explanation:

We know that, Elements in the same group of the periodic table have similar characteristics.

Here Magnesium and Strontium shared some similar properties because they both belong to the same group. Sr is the chemical symbol for strontium which is a group two element; it has atomic number of 38. 

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Q:

The first indication that a stable nucleus can be broken down was afforded by

A) Rutherford B) Madam Curie
C) Soddy D) Schmidt
 
Answer & Explanation Answer: A) Rutherford

Explanation:
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Q:

Which combination will produce a precipitate?

A) NaOH (aq) and HCl (aq) B) KOH (aq) and Mg(NO3)2 (aq)
C) NaC2H3O2(aq) and HCl (aq) D) AgNO3(aq) and Ca(C2H2O3) (aq)
 
Answer & Explanation Answer: B) KOH (aq) and Mg(NO3)2 (aq)

Explanation:

In chemistry, a precipitate is an insoluble solid that emerges from a liquid solution. The emergence of the insoluble solid from solution is called precipitation.

Which_combination_will_produce_a_precipitate1558607544.jpg image

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Q:

Cathode rays have

A) mass only B) charge only
C) no mass and no charge D) mass and charge both
 
Answer & Explanation Answer: D) mass and charge both

Explanation:
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