Chemistry Questions

Q:

Boron cannot form which one of the following anions?

(1) BO2-

(2) BF63-

(3) BH4-

(4) B(OH)4-

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

Explanation:

Due to absence of low lying vacant d orbital in B, sp3d2hybridization is not possible hence BF63-will not formed. 

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Q:

Which of the following is NOT a property of bases?

 

A) They react with acids and neutralise them B) They turn red litmus blue
C) They turn blue litmus red D) They have bitter taste
 
Answer & Explanation Answer: C) They turn blue litmus red

Explanation:
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Q:

Among the following the maximum covalent character is shown by the compound

(1)MgCl2

(2)FeCl2

(3)SnCl2

(4) AlCl3

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

Explanation:

According to Fajans rule, cation with greater charge and smaller size favours covalency.

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Q:

Silver Mirror test is given by which one of the following compounds?

1. Benzophenone

2. Acetaldehyde

3. Acetone

4. Formaldehyde

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

Explanation:

Both Formaldehyde and Acetaldehyde will give this test

 HCHO[Ag(NH3)2+]    Silver mirrorAg + Organic compound

 CH3-CHO [Ag(NH3)2+] AgSilver mirror+ Organic compound 

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Q:

which of the following are chemical changes?

A) Cooking of Food

B) Digestion of Food

C) Freezing of water

D) Water is heated up

A) A & B B) A, B & C
C) C & D D) All the above
 
Answer & Explanation Answer: A) A & B

Explanation:

A) Cooking of Food  ------ Chemical Change

B) Digestion of Food ----- Chemical Change

C) Freezing of water ----- Physical Change

D) Water is heated up ---- Physical Change

because here the chemical composition of the substance changes in A & B only.

 

Since we know that, If the chemical composition is changing then it is a chemical change and if the chemical composition is remaining the same, then it is a physical change.

 

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Q:

Burning Magnesium ribbon produces white ash, which dissolves in water to form____.

 

A) Magnesium Halides B) Magnesium Oxide
C) Magnesium Hydroxide D) Magnesium Sulphate
 
Answer & Explanation Answer: C) Magnesium Hydroxide

Explanation:
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Q:

The maximum number of electrons that can be accommodated in a shell depends on the formula

 

A) 1n2 B) n2
C) 3n2 D) 2n2
 
Answer & Explanation Answer: D) 2n2

Explanation:
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Q:

Which compound matches the IR Spectrum?

 

spectr1525848245.jpg image

A) 1, 5 – hexadiene B) 3 – Hexanol
C) Trans – 4 – octene D) None of the above
 
Answer & Explanation Answer: A) 1, 5 – hexadiene

Explanation:

3 – Hexanol:


image

There is no alcohol stretch present in the spectrum. Therefore, the above structure is not suitable for the given spectrum.

 

Trans – 4 – octene:


image

There is no vinyl bending present in the spectrum. Therefore, the above structure is not suitable for the given spectrum.


1, 5 – hexadiene:


image

The vinyl bending and other stretches were matched with the above structure.

 

 

Hence, the c = c stretch, vinyl bending and image stretch were matched with the above structure.

Therefore, the given spectrum belongs to 1, 5 – hexadiene.

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