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Q:

Dust particles in the air of large industrial cities are removed by 

A) Sedimentation B) Electrophoresis
C) Tyndall effect D) Brownian movement

Answer:   B) Electrophoresis

Explanation:

Dust particles such as coal dust(smoke) are fine particle of a solid (carbon in the case of smoke) dispersed in air. They are colloidal systems and the particles are charged either positive or negative. In an applied electrical field, they are attracted towards the opposite electrodes. Movement of the particles towards the electrodes is known as 'electrophoresis'. Hence electrophoresis is applied to remove smoke within the chimeny itself without allowing it to escape into the air and cause nuisance.

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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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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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 12
Q:

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

Answer

Answer : 1


Sol :

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