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 Chemistry Questions

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Q:

The hard Shell of an egg was dissolved in HCL. The egg was then placed in a concentration solution of NaCl. What will happens ______

A) The egg will shrink B) The egg will swell
C) The egg will become harder D) There will be hardly any visible change
 
Answer & Explanation Answer: A) The egg will shrink

Explanation:
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27 8709
Q:

The Most Abundant Rare Gas in the Atmosphere is

A) Xe B) He
C) Ne D) Ar
 
Answer & Explanation Answer: D) Ar

Explanation:

Argon is most the most abundant Rare Gas in the atmosphere. Its elemental symbol is Ar. 

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Q:

Van der Waal's equation explains the behaviour of _____

A) Ideal gases B) Real gases
C) Mixture of gases D) Diatomic gases
 
Answer & Explanation Answer: B) Real gases

Explanation:
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15 8645
Q:

TEL minimise the knocking effect when mixed with petrol, it acts as_______

A) Positive catalyst B) Negative catalyst
C) Auto catalyst D) Induced catalyst
 
Answer & Explanation Answer: B) Negative catalyst

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18 8525
Q:

Which of the following is called 'the King of Chemicals' ?

A) Nitric acid B) Hydrochloric acid
C) Silver nitrate D) Sulphuric acid
 
Answer & Explanation Answer: D) Sulphuric acid

Explanation:

Sulphuric acid is called the King of Chemicals because it is used in the preparation of a very large number of other useful chemicals such as hydrochloric acid, nitric acid, dyes, drugs etc. In fact the annual production of shulpuric acid in a country is a measure of the economy of the country.

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9 8520
Q:

Which one of the following is an element?

A) Topaz B) Rruby
C) Diamond D) Sapphire
 
Answer & Explanation Answer: C) Diamond

Explanation:

Here in the given options, Diamond is an element as it is the allotrope of the carbon atom.

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14 8403
Q:

The charge on positron is equal to the charge on

A) proton B) electron
C) alpha- particle D) neutron
 
Answer & Explanation Answer: A) proton

Explanation:
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19 8385
Q:

The main element used in the vulcanisation of rubber is

A) nickel B) copper
C) sulphur D) graphite
 
Answer & Explanation Answer: C) sulphur

Explanation:

In vulcanization, cruder rubber is heated with 3% sulphur at about for 1200C for 2-3 hours.

Vulcanised rubber is a vastly improved product.

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