1
Q:

According to the modern Periodic Law, the properties of elements are periodic functions of their

A) volency B) atomic mass
C) number of neutrons D) atomic number

Answer:   D) atomic number

Explanation:

Atomic number is the serial number of an element in the periodic classification of elements. It gives the number of protons and also the number of electrons in an atom.

Subject: Chemistry
Q:

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is

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

Explanation:

So formula of compound is 

i.e., 

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1 26
Q:

The degree of dissociation () of a weak electrolyte,  is related to van't Hoff factor (i) by the expression:

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

Explanation:

Total Moles = 

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Q:

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :

A) An acetylenic triple bond B) Two ethylenic double bonds
C) A vinyl group D) An isopropyl group
 
Answer & Explanation Answer: C) A vinyl group

Explanation:

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0 10
Q:

The structure of  is

A) Pentagonal bipyramid B) Square pyramid
C) Trigonal bipyramid D) Octahedral
 
Answer & Explanation Answer: A) Pentagonal bipyramid

Explanation:

Hybridisation of iodine is 

So, structure is pentagonal bipyramid.

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0 11
Q:

The outer electron configuration of Gd (Atomic No : 64) is

Answer

Answer : 1


Sol :

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