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 Chemistry Questions

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Q:

What is the position of metallic ion and non-metallic ion in a chemical formula?

 

A) Metal ion at second position B) Non-metal ion at first position
C) Metal ion at first and non-metal ion at second position D) No option is correct
 
Answer & Explanation Answer: C) Metal ion at first and non-metal ion at second position

Explanation:
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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:

An electron loses potential energy when it

 

A) shifts to a more electronegative atom. B) increases its kinetic energy.
C) shifts to a less electronegative atom. D) increases its activity as an oxidizing agent.
 
Answer & Explanation Answer: A) shifts to a more electronegative atom.

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Q:

Which one of the following mixture is homogeneous?

 

A) Water and oil B) Starch and sugar crystals
C) Graphite and charcoal D) Alloys
 
Answer & Explanation Answer: D) Alloys

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Q:

What is the structure of IF7 ?

A) Triagonal bipyramid B) Pentagonal bipyramid
C) Square pyramid D) tetrahedral
 
Answer & Explanation Answer: B) Pentagonal bipyramid

Explanation:

In IF7 out of 7 Flourine atoms 5 of them are placed on a plane in Pentagon shape .In remaining 2 flourines one is placed above the plane and other below the plane each at 90 degrees

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Q:

Fill in the blank with the most appropriate option.

 

Ethanol is denatured to ___.

 

A) make it unsuitable for drinking B) make it suitable for drinking
C) increase its stability D) make it suitable as an antiseptic
 
Answer & Explanation Answer: A) make it unsuitable for drinking

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Q:

Which of the following statements is/are true or false?

 

Statements :

 

A) H2S burns in air to give H2O and SO2

B) The decomposition of Ferrous Sulphate into Fe2O3, SO2 and SO3 occurs in the presence of heat.

 

A) Statements A and B both are true B) Statement A is true, while B is false
C) Statements A and B are false D) Statement B is true, while A is false
 
Answer & Explanation Answer: A) Statements A and B both are true

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Q:

Which among the following statements are TRUE regarding synthetic fibre?

 

I. They melt after catching fire.

II. They are more durable.

III. They are prepared by a number of processes using petrochemicals.

 

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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