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Q:

Which are two chemicals used to purify water?

A) Chlorine & Fluorine B) Fluorine & Iodine
C) Chlorine & Hydrogen peroxide D) Fluorine & Iodine
 
Answer & Explanation Answer: C) Chlorine & Hydrogen peroxide

Explanation:

Removing the contaminents if any in the water which causes harm to our health is involved in the purifying of water. 

 

This process involves chemicals. Chloramines, Hydrogen peroxide, Iodine are the chemicals which are used in purifying water.

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Q:

What is the location of India's first elevated Urban Expressway?

 

A) Mumbai to Pune B) Delhi to Gurugram
C) Chennai to Bengaluru D) Lucknow to Allahabad
 
Answer & Explanation Answer: B) Delhi to Gurugram

Explanation:
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Q:

Which of the following items was NOT exportable in the past Gupta period?

 

A) Iron B) Gold
C) Tin D) Silver
 
Answer & Explanation Answer: C) Tin

Explanation:
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Q:

Rearrange the parts of the sentence in correct order.

 

Private companies are

 

P : exploiting groundwater

Q : resources in India

R : due to outdated law

 

A) QPR B) PQR
C) RPQ D) PRQ
 
Answer & Explanation Answer: B) PQR

Explanation:
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Q:

Select the synonym of

 

antithesis

 

A) contradictory B) harmony
C) affinity D) analogy
 
Answer & Explanation Answer: A) contradictory

Explanation:
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Q:

Which group in the modern periodic table contains elements that are inert gases? 

 

A) Group 16    B) Group 18 
C) Group 17  D) Group 15
 
Answer & Explanation Answer: B) Group 18 

Explanation:
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Q:

Improve the bracketed part of the sentence

I prefer black coffee (over) cappuccino.

A) rather than B) to
C) instead of D) no improvement
 
Answer & Explanation Answer: B) to

Explanation:
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Q:

Which of the following acts both as oxidising and reducing agent?

A) nitric acid B) ammonia
C) nitrous acid D) nitrogen peroxide
 
Answer & Explanation Answer: C) nitrous acid

Explanation:

Nitrous acid act as an oxidising agent because it oxidises potassium iodide to iodine. It is also a reducing agent because it decolourises acidified potassium permanganate solution.

Nitric acid acts only as an oxidising agent

Ammonia acts only as a reducing agent

Nitrogen peroxide acts only as an oxidising agent.

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