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NEET Chemistry Solved Question Paper 2016

Multiple Choice Questions

31.
Assertion : Staggered conformation of ethane is 12.5 kJ mol^-1 more stable than the eclipsed conformation.
Reason : The two conformations of ethane cannot be separated at room temperature.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false.

If both assertion and reason are true but reason is not the correct explanation of assertion

Staggered conformation is more stable because in this conformation any two hydrogen atoms on adjacent carbon atoms are as far apart as possible and the repulsion between the electron clouds of $σ$ - bonds of two non-bonded hydrogen atoms is minimum.

The energy difference of 12.55 kJ mol^-1 is not large enough to prevent rotation at room temperature as a result it is not possible to seperate the two conformations of ethane.

32.

Assertion : The Dumas method is more applicable to nitrogen containing organic compounds than the Kjeldahl's method.

Reason: The Kjeldahl's method does not give satisfactory results for compounds in which nitrogen is directly linked to oxygen.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false

33.

How many Faradays of electricity are required for the given reaction to occur ?

Mn $O_{4}^{-} \to$ Mn²⁺

34.

Paints and hair creams are respectively

sol and emulsion
aerosol and foam
emulsion and sol
foam and gel.

35.

Chlorine oxidises sodium thiosulphate to form

Na₂SO₃
Na₂O
Na₂SO₄
Na₂CO₃

36.

Large difference in boiling points is observed in

N and P
P and As
As and Sb
Sb and Bi

37.

Arrange the given compounds in decreasing order of boiling points.

I. CH₃CH₂CH₂CH₂Br

II. C(CH₃)₃Br

III. CH₃-CH₂-CH(CH₃)-Br

I > III > II
II > I > III
I > II > III
III > I > II

38.

If an atom crystallises in bee lattice with r= 4 Å then the edge length will be

2 Å
8 Å
2.39 Å
9.23 Å

39.

A first order reaction, which is 30% complete in 30 minutes has a half-life period of

102.2 min
58.2 min
24.2 min
120.2 min

40.

Two elements A and B form compounds of formula AB₂ and AB₄. When dissolved in 20.0 g of benzene 1.0 g of AB₂ lowers freezing point by 2.3°C whereas 1.0 g of AB₄ lowers freezing point by 1.3°C. The K_f for benzene is 5.1. The atomic masses of A and B are