Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

An element with atomic number 84 and mass number 218 loses one a-particle and two β-particles in three successive stages .The resulting element will have :

  • at. no. 84 and mass no. 214

  • at no. 82 and mass no. 214

  • at. no. 84 and mass no. 218

  • at. no. 82 and mass no. 218


12.

Structure of (SiO4)4- ion is :

  • tetrahedral

  • square planar

  • octahedral

  • planar triangular


13.

The linear molecule is :

  • CH3

  • C2H2

  • NH3

  • H2O


14.

An organic substance containing carbon , hydrogen and oxygen gave the following percentage composition .

C = 40.687 % , H = 5.085% and O = 54.228 % 

What is the empirical formula of the compound ?

  • CH3O

  • C2H2O

  • CH4O

  • C2H3O2


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15.

The function of anhydrous AlCl3 in the Friedel-Craft's reaction is to :

  • absorb water

  • absorb HCl

  • to produce electrophile

  • to produce nucleophile


16.

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas A and an alkaline solution .The solution on exposure to air produces a thin solid layer of B on the surface .The compounds A and B will be :

  • Ca3N2 , NH3

  • NH3 , CO2

  • Ca(OH)2 , CaCO3

  • NH3 , CaCO3


17.

Consider the reaction ,

Fe2+  Fe3+ + e-

  • the reaction towards the left is a reduction

  • the reduction towards the right is a reduction

  • the reaction towards the right is an oxidation

  • the reaction towards the right is an oxidation and the reaction towards the left is an reduction


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18.

When two double bonds are present on adjacent carbon atoms , the diene is called as :

  • conjugated diene

  • cumulative diene

  • isolated diene

  • None of these


B.

cumulative diene

When two double bonds are present on adjacent carbon atoms , the diene is called cumulative diene .Allene (C3H4) is the simplest example of cumulative diene .

H2C=C=CH2 (allene)


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19.

Lindlar's catalyst/H2RCCR Na/NH3 A ,

A and B are geometrical isomers (RCH=CHR)

  • A is cis , B is trans

  • A is trans , B is cis

  • A and B both are cis

  • A and B both are trans


20.

The homologue of ethyne is :

  • C2H4

  • C3H6

  • C3H3

  • C3H4


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