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Q:

Water which is suitable for drinking is called _______________ water.

 

A) hygienic B) sparkling
C) potable D) sanitary
 
Answer & Explanation Answer: C) potable

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Q:

Carbon dioxide is one of the gases that cause the _________.

 

A) greenhouse effect   B) ozonification  
C) oven phenomenon   D) sunburn  
 
Answer & Explanation Answer: A) greenhouse effect  

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Q:

The electronic dot and cross structure of ethene is ............

 

A) B)
C) D)
 
Answer & Explanation Answer: C)

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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

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Q:

Lime water becomes white due to which gas?

 

A) CO2 B) O2
C) NO2   D) N2
 
Answer & Explanation Answer: A) CO2

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Q:

Which of the following statement(s) about acids is/are CORRECT ?
 
I. They change the color of red litmus to blue.
II. They change the color of blue litmus to red.
III. They have pH value less than 7.
 

A) Only I and III B) Only II and III
C) Only I D) Only II
 
Answer & Explanation Answer: B) Only II and III

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Q:

Which of the following statement(s) is/are INCORRECT?

I. Alkenes are fairly unreactive.

II. Alkenes burn with blue flame.

III. Alkanes burn with yellow flame.

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: D) All I, II and III

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Q:

The most reactive of the following metals is

 

A) Al B) Ca
C) Ni D) Pb
 
Answer & Explanation Answer: B) Ca

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