40
Q:

Temporary hardness is due to the presence of 

A) Calcium carbonate B) calcium bicarbonate
C) magnesium sulphate D) calcium sulphate

Answer:   B) calcium bicarbonate



Explanation:

Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.

Subject: Chemistry
Q:

The oxygen liberated during photsynthesis comes from

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

Explanation:
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0 70
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 54
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

Explanation:
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0 56
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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1 481
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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1 984
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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1 279
Q:

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

 

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

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1 241
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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