91
Q:

 A mixture of sand and naphthalene can be separated by

A) Fractional distillation B) Sublimation
C) Chromatography D) Any of them

Answer:   B) Sublimation



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Subject: Chemistry
Q:

The oxygen liberated during photsynthesis comes from

A) Water B) Carbon dioxide
C) Glucose D) Chlorphyll
 
Answer & Explanation Answer: A) Water

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0 106
Q:

Which of the following is not a donor atom?

A) Phosphorus B) Antimony
C) Arsenic D) Aluminium
 
Answer & Explanation Answer: D) Aluminium

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1 105
Q:

The waste management technique that involves the use of micro-organisms to remove or neutralize pollutants from contaminated site is called

A) Bio sensor B) Bio magnification
C) Bio remediation D) Bio concentration
 
Answer & Explanation Answer: C) Bio remediation

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0 79
Q:

The elements belonging to groups ............ are known as 'd' block elements.

 

A) 3 to 12 B) 1 and 2
C) 13 to 18 D) 3 to 10
 
Answer & Explanation Answer: A) 3 to 12

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1 531
Q:

220 g of carbon dioxide contains .......... moles.

 

A) 5 B) 6
C) 3 D) 4
 
Answer & Explanation Answer: A) 5

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1 1165
Q:

A solution contains 42 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution?

 

A) 11.6 g B) 12.6%
C) 11.6% D) 10.36%
 
Answer & Explanation Answer: C) 11.6%

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1 304
Q:

............ is a purple-coloured solid halogen.

 

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

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1 297
Q:

The chemical formula of Ammonium phosphate is ............

 

A) (NH4)3PO4 B) (NH4)2PO4
C) (NH4)2P02 D) NH4PO4
 
Answer & Explanation Answer: A) (NH4)3PO4

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