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Q:

Which  of  the  following  substances  cause temporary hardness in water?

1. Mg(HCO3)2

2. Ca(HCO3)2

3. CaCl2

4. MgSO4

A) 3 and 4 B) 2and 3
C) 1 and 4 D) 1 and 2
 
Answer & Explanation Answer: D) 1 and 2

Explanation:

There are two types of water hardness: temporary and permanent hardness. Temporary hardness is due to the presence of calcium hydrogen carbonate Ca(HCO3)2(aq) and magnesium hydrogen carbonate Mg(HCO3)2(aq).

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Q:

Which one of the following statements would be INCORRECT to use?

 

A) An atom of a compound B) A mole of an element
C) A mole of a compound D) An atom of an element
 
Answer & Explanation Answer: A) An atom of a compound

Explanation:
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Q:

Match the following items of column A with column B.

 

 

A) I – 3, II – 1, III – 2   B) I – 2, II – 1, III – 3  
C) I – 2, II – 3, III – 1   D) I – 1, II – 2, III – 3
 
Answer & Explanation Answer: B) I – 2, II – 1, III – 3  

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Q:

The movement of water molecules through the plasma membrane is called ______.

 

A) Osmosis B) Sedimentation
C) Precipitation D) Transpiration
 
Answer & Explanation Answer: A) Osmosis

Explanation:
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Q:

Atmosphere of Venus mostly contains which of the following gases? 

 

A) Nitrogen  B) Hydrogen 
C) Oxygen  D) Carbon dioxide
 
Answer & Explanation Answer: D) Carbon dioxide

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Q:

Ionic compounds ______.

 

I. have high boiling point

II. have high melting point

III. conduct electricity in solution

 

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:

Apart from proposing atomic theory, what did John Dalton researched on?

 

A) Plants B) Colour blindness
C) Penicillin D) Plastic
 
Answer & Explanation Answer: B) Colour blindness

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Q:

What is formed when helium atom loses one electron?

 

A) Proton B) Positive helium ion
C) Negative helium ion D) Alpha particle
 
Answer & Explanation Answer: B) Positive helium ion

Explanation:
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