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Q:

what is the chemical name of the compound 

Cu2CO3

A) copper (ii) carbonate B) copper (iii) carbonate
C) copper (i) carbonate D) copper carbonate
 
Answer & Explanation Answer: C) copper (i) carbonate

Explanation:

The chemical name of the compound 

Cu2CO3 is Copper (i) carbonate and is also called as cuprous carbonate.

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Q:

Improve the bracketed part of the sentence.


My cousins insisted that I should watch the documentary (from beginning to the end).

A) from a beginning to end B) from the beginning to the end
C) from the beginning to end D) No improvement
 
Answer & Explanation Answer: B) from the beginning to the end

Explanation:
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Q:

Select the synonym of:

 

streak

A) freak B) bright
C) immaculate D) smear
 
Answer & Explanation Answer: D) smear

Explanation:
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Q:

Methane contributes towards global warming so it is called a _________________ gas.

 

A) poisonous B) carcinogenic
C) infectious D) greenhouse
 
Answer & Explanation Answer: D) greenhouse

Explanation:
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Q:

Select the antonym of

to scowl

 

A) to glower B) to smirk
C) to grimace D) to grin
 
Answer & Explanation Answer: D) to grin

Explanation:
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Q:

Which word or words explains the meaning of the following idioms:-

The alpha and the omega

A) The beginning and the end B) A nice act
C) The stars and the moon D) Very costly
 
Answer & Explanation Answer: A) The beginning and the end

Explanation:

The alpha and the omega means the beginning and the end; the entirety of something. (Alpha and omega are the first and last letters of the Greek alphabet).

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Q:

The group of crop plant that are vegetatively propagated is:

 

A) potato,papaya and banana B) Sugarcane,potato and banana
C) groundnut,drumstick and cashew nut D) Onion,coriander and lime
 
Answer & Explanation Answer: B) Sugarcane,potato and banana

Explanation:
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Q:

Place these hydrocarbons in order of decreasing boiling point.

1. Paraffin

2. Octadecane

3. Hexane

4. Neohexane and

5. Ethane

A) Paraffin > Octadecane > Neohexane > Hexane > Ethane B) Paraffin > Octadecane > Hexane > Neohexane > Ethane
C) Hexane > Paraffin > Octadecane > Neohexane > Ethane D) None of the above
 
Answer & Explanation Answer: B) Paraffin > Octadecane > Hexane > Neohexane > Ethane

Explanation:

In hydrocarbon, the boiling point directly varies with the length of carbon chain. On increasing the number of carbon atom, the boiling point of the compound also increases. Paraffin contains highest number of carbon atoms whereas, ethane is comprised of two carbon atoms.

 

The decreasing order of boiling point of mention compounds is written as follows:

Paraffin > Octadecane > Hexane > Neohexane > Ethane

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