Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Which one of the following will show optical isomerism?

  • OH-CH2-CO2H

  • CH3-CH(OH)-CO2H

  • (CH3)2-CH-CO2H

  • (CH3)2-C(Cl)-CO2H


B.

CH3-CH(OH)-CO2H

2-hydroxypropanoic acid has a central carbon atom, which is linked to four different groups. This carbon atom is called chiral carbon atom and the molecule is called a chiral molecule. Hence, 2-hydroxy propanoic acid shows optical isomerism.

Enantiomers


12.

The sp3d2 hybridisation of central atom of a molecule would lead to:

  • square planar geometry

  • tetrahedral geometry

  • trigonal bipyramidal geometry

  • octahedral geometry


D.

octahedral geometry

The sp3d2 and d2sp3 hybridisation of central atom leads to octahedral geometry.


13.

The hybridisation of C2 and C3 of H3C-CH=C=CH-CH3 are:

  • sp , sp3

  • sp2 , sp

  • sp2 , sp2

  • sp , sp


B.

sp2 , sp

CH31-CHsp22=Csp3=CH4-CH35


14.

The solubility of Ca3(PO4)2 in water is y mol/L. Its solubility product is:

  • 6y4

  • 36y4

  • 64y5

  • 108y5


D.

108y5

Ca3(PO4)2(s) 3Ca2+3y (q) + 2PO43- (aq)

so, KSP = [Ca2+]3 . [PO43-]2

= (3y)3.(2y2)

= 27y3 x 4y2

= 108y5


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15.

The ease of nitration of the following three hydrocarbons follows the order:

  • II = III = I

  • II > III > I

  • III > II > I

  • I = III > II


B.

II > III > I

The ease of nitration of the hydrocarbons depends upon the stability of arenium ion formed.

In compound II, the carbonium ion has two methyl groups (with +I effect) capable of partially neutralising the positive charges on the ring carbon atoms. In compound I and II, only one methyl group can act in this way. Moreover, in compound III two methyl groups have +I effet, whereas in compound I only one methyl group with +I effect is present. Thus, the stability of arelium ion and ease of nitration follows the order,

II > III > I


16.

The normality of 30 volume H2O2 is:

  • 2.678 N

  • 5.336 N

  • 8.034 N

  • 6.685 N


B.

5.336 N

Volume strength = 5.6 x normality

or normality = volume strength5.6 = 305.6 = 5.35 N


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17.

If the molecular wt. of Na2S2O3 and I2 are M1 and M2 respectively then what will be the equivalent weight of Na2S2O3 and I2 in the following reaction?

2S2O32- + I2  S4O62- + 2I-

  • M1 , M2

  • M1 , M2/2

  • 2M1 , M2

  • M1 , 2M2


B.

M1 , M2/2

 Equivalent mass of S2O32-M11 = M1  and equivalent mass of I2M22


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18.

The ozone layer forms naturally by :

  • the interaction of CFC with oxygen

  • the interaction of UV radiation with oxygen

  • the interaction of IR radiation with oxygen

  • the interaction of oxygen and water vapour


B.

the interaction of UV radiation with oxygen

The formation of ozone in the stratosphere takes place by the interaction of O2 molecules with high energetic ultraviolet radiation.

O2  O + O

O + O2  O3


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19.

A radioactive atom MYX emits two α particles and one β particle successively. The number of neutrons in the nucleus of the product will be:

  • X - 4 - Y

  • X - Y - 5

  • X - Y - 3

  • X - Y - 6


B.

X - Y - 5

An α-emission reduces the atomic mass by 4 and atomic number by 2, whereas a β-emission increases the atomic number by 1 with no change in atomic mass.

MYX -α NY-2X-4 -α OY-4X-8 -β PY-3X-8

Number of neutrons = mass number - atomic number

= X - 8 - Y + 3

= X - Y - 5


20.

Among the alkenes which one produces tertiary butyl alcohol on acid hydration?

  • CH3-CH2-CH=CH2

  • CH3-CH=CH-CH3

  • (CH3)2C=CH2

  • CH3-CH=CH2


C.

(CH3)2C=CH2

Iso-butylene directly adds a molecule of water in the presence of H2SO4 as a catalyst to form tertiary butyl alcohol.


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