Q:

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

1. α=x+y+1i-1

2.α=x+y-1i-1

3. α=i-1x+y+1

4. α=i-1x+y-1

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

Explanation:

Van't Hoff factor (i) = Observed Colligative PropertyNormal Colligative Property

 

AxBy1-αxA+yxα+yB-xyα  

 

Total Moles = 1-α+xα+yα = 1-αx+y-1

 

i=1+αx+y-11

 

α=i-1x+y-1

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Exam Prep: AIEEE

4 4766
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:

C=}CH2OzonolysisHCHO

Vinylic group.

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1 3462
Q:

The structure of IF7 is

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

Explanation:

Hybridisation of iodine is sp3d3

 

So, the structure is pentagonal bipyramid.

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0 2356
Q:

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

1. 4f75d16s2

2. 4f35d56s2

3. 4f85d06s2

4. 4f45d46s2

Answer

Answer : 1


 


Sol :


1. 4f75d16s2

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Subject: Chemistry Exam Prep: AIEEE

12 6582
Q:

Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at –6°C will be: (Kf  for water = 1.86 Kg/mol and molar mass of ethylene glycol = 62 kg/mol)

A) 204.60 g B) 304.30 g
C) 804.32 g D) 400.00 g
 
Answer & Explanation Answer: C) 804.32 g

Explanation:

Tf = kf.m 

for ethylene glycol in aq. solution

 Tf = kf wmol.wt × 1000wt. of solvent6 = 1.86 x w x 100062 x 4000

=> w = 800 g

 

So, the weight of solute should be more than 800 g.

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4 5202
Q:

The magnetic moment (spin only) of  [NiCl4]2-is

A) 1.41 BM B) 1.82 BM
C) 5.46 BM D) 2.82 BM
 
Answer & Explanation Answer: D) 2.82 BM

Explanation:

Hybridisation of Ni is e-  

Unpaired 3d8in  is 2 

So Ω = n(n+2)BM=2x4 = 8 = 2.82BM

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5 3361
Q:

In a certain city, 5% of all the persons in town have unlisted phone numbers. If you select 100 names at random from that city's phone directory, how many people selected will have unlisted phone numbers?

Answer

  Zero. You are selecting names from the list, so they are all listed.

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Subject: Math Puzzles

3 2660
Q:

I. Rural and semi-urban areas in the country have been suffering due to load shedding for quite some time.

II. If the Government is not able to overcome the power crisis, load shedding will be extended even to the urban areas.

 

A) Statement I is the cause and statement II is its effect B) Statement II is the cause and statement I is its effect
C) Both the statements I and II are effects of independent causes D) Both the statements I and II are effects of some common cause
 
Answer & Explanation Answer: D) Both the statements I and II are effects of some common cause

Explanation:

The facts given in both the statements are clearly the result of acute power shortage.

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5 1486