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Q:

Modern periodic table is based on atomic number of the elements. The significance of atomic number was proved by the experiment of ________

A) Moseley's work on X-ray spectra B) Bragg's work on X-ray diffraction
C) Mulliken's oil drop experiment D) Discovery of X-ray by Roentgen

Answer:   A) Moseley's work on X-ray spectra

Explanation:
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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6 245
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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2 339
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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1 314
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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2 329
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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