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Q:

Which of the following reactions are exothermic?

 

1)   C + O2  → CO22)  2Mg + O2  → 2MgO3)  CuSO4 + 5H2O  → CuSO4.5H2O4)  All the above

A) 1 B) 2
C) 3 D) 4

Answer:   D) 4



Explanation:

Here all the given options are Exothermic reactions. Exothermic reactions are those reactions which involves the release of heat.

 

Generally all the combining reactions are exothermic in nature.

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Which of the following has the highest boiling point?

A) 2,3-dimethylbutane B) 2-methylpentane
C) 2,2-dimethylbutane D) 1,2-methylpentane
 
Answer & Explanation Answer: C) 2,2-dimethylbutane

Explanation:

Due to the molecules present in the 2,2-dimethylbutane are closely packed, it has the highest boiling point.

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Q:

Which of the following is not soluble in water?

A) sodium chloride B) potassium sulfate
C) copper(II) hydroxide D) silver nitrate
 
Answer & Explanation Answer: B) potassium sulfate

Explanation:

We know that,

All nitrates are soluble in water.

All chlorides are soluble in water with the exception of those formed with silver , lead , mercury ions as all halides are soluble.

Sulphates are soluble in water.

Hydroxides are not soluble in water.

 

Hence, copper(II) hydroxide is not soluble in water.

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Q:

Which one of the following is not true for minerals?

A) they can be a liquid, solid, or glass B) they can be identified by characteristic physical properties
C) they have a specific, internal, crystalline structure D) they have a specific, predictable chemical composition
 
Answer & Explanation Answer: A) they can be a liquid, solid, or glass

Explanation:

A mineral is a naturally occurring, inorganic solid, with a definite chemical composition. They cannot be in liquid or gas state. They exists only in solid state.

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3 3048
Q:

Diamond is harder than Graphite because of

A) tetrahedral structure of diamond B) difference of crystalline structures
C) difference of layers of atoms D) hexagonal structure of graphite
 
Answer & Explanation Answer: B) difference of crystalline structures

Explanation:

Here are the differences between Diamond and Graphite :

 

diamond_is_harder_than_graphite_because_of1557300898.jpg image

 

From the above analysis, Diamond is harder than Graphite because of the difference of crystalline structures.

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3 3478
Q:

Infiltration is the process by which rainwater becomes

A) river water B) ground water
C) salt water D) ocean water
 
Answer & Explanation Answer: B) ground water

Explanation:

The process of absorbtion of rain water by the soil on the earth is called infiltration. By this process, the rain water that falls on the soil becomes ground water.

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Q:

Permanent hardness of water may be removed by the addition of

A) Alum B) Lime
C) Sodium Carbonate D) Potassium Permanganate
 
Answer & Explanation Answer: C) Sodium Carbonate

Explanation:

Permanent hardness of water may be removed by the addition of Sodium Carbonate.

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Q:

Which gas is used for the preparation of Soda water?

A) Carbon Dioxide B) Oxygen
C) Hydrogen D) Ammonia
 
Answer & Explanation Answer: A) Carbon Dioxide

Explanation:
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2 2087
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Which molecule is used up in photosynthesis?

A) Water B) Carbohydrates
C) Oxgen D) Sugar
 
Answer & Explanation Answer: A) Water

Explanation:

The first step in photosynthesis is to split the water molecule using sun light.

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