1
Q:

If people sleep in closed rooms where charcoal fire is burning , they die due to 

A) carbon monoxide B) carbon dioxide
C) methane D) phosgene

Answer:   A) carbon monoxide

Explanation:

A closed room is aplace where charcoal is burnt in limited supply of air. There is every chance for the formation of the deadly poisonous carbon monoxide, which when inhaled, reacts with the iron in haemoglobin of blood and prevents the supply of oxygen. It is said to be treacherous as there can be no previous warning of its presence because it is an odourless and colourless gas.

Subject: Chemistry
Q:

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

(1) 

(2) 

(3) 

(4) 

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

Explanation:

While moving from left to right in periodic table basic character of oxide of elements will decrease.

and while descending in the group basic character of corresponding oxides increases.

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5 104
Q:

Boron cannot form which one of the following anions?

(1) 

(2) 

(3) 

(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,  hybridization is not possible hence will not formed. 

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2 138
Q:

Among the following the maximum covalent character is shown by the compound
(1)
(2)
(3)
(4)

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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1 134
Q:

The reduction potential of hydrogen half-cell will be negative if :
(1)  = 2 atm and [H+] = 2.0 M
(2)  = 1 atm and [H+] = 2.0 M
(3) = 1 atm and [H+] = 1.0 M
(4) = 2 atm and [H+] = 1.0 M

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

Explanation:

Apply Nernst equation

Therefore E is Negative

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2 156
Q:

Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is :

A) Chloroform B) 2, 2, 2-Trichloroethanol
C) Trichloromethanol D) 2, 2, 2-Trichloropropanol
 
Answer & Explanation Answer: B) 2, 2, 2-Trichloroethanol

Explanation:

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0 101