Questions

Q:

Which one of the following statements is correct?

A) The oxidation number for hydrogen is always zero. B) The oxidation number for hydrogen is always + 1.
C) The oxidation number for hydrogen is always -1. D) Hydrogen can have more than one oxidation number.
 
Answer & Explanation Answer: D) Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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Q:

Chemical properties of isotopes .............

A) must be same B) must be different
C) need not be same D) need not be different
 
Answer & Explanation Answer: A) must be same

Explanation:
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Q:

What is the other name of sodium carbonate?

A) Baking soda B) Washing soda
C) Baking powder D) No option is correct
 
Answer & Explanation Answer: B) Washing soda

Explanation:
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Q:

"Forests" is listed in the __________ list given in the Seventh Schedule in the Constitution of India.

A) Union B) State
C) Global D) Concurrent
 
Answer & Explanation Answer: D) Concurrent

Explanation:
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Q:

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

 

The news has always ____________ predicated on informing the consumer. It speaks of — apart from the day’s most ____________ upheavals — the best and the worst that _____________ has managed to accomplish each day. This includes the medal-winners, the laureates, the record-breakers, the deal-makers _________the criminals, the villains, the corrupt. The news regales us ________ the highlights, a reel of the most provoking ones that made it into a window of a half-an-hour.

 

The news has always ____________ predicated on informing

 

A) be B) to be
C) been D) being
 
Answer & Explanation Answer: C) been

Explanation:
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Q:

Where did the telegraph line be laid first?

A) Calcutta to Agra B) Agra to Jaipur
C) Delhi to Shimla D) Raniganj to Calcutta
 
Answer & Explanation Answer: A) Calcutta to Agra

Explanation:
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Q:

Charles Darwin, the famous evolutionist, proposed his theory in which one of his books ?

A) The families of flowering plant B) The origin of species
C) The life on earth D) The story of the living world
 
Answer & Explanation Answer: B) The origin of species

Explanation:
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Q:

The mass per unit volume is called

A) Force B) Work
C) Density D) Pressure
 
Answer & Explanation Answer: C) Density

Explanation:
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