The most basic element is from Chemistry NEET Year 2012 Free Sol

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following sets of quantum numbers represents the highest energy level in an atom?

  • n = 4; l = 0; m = 0; s = +12

  • n = 3; l = 1; m = 1; s = +12

  • n = 3; l = 2; m = -2; s = +12

  • n = 3; l = 0; m = 0; s = +12


2.

For the homogeneous reaction,

4NH3 + 5O2  4NO + 6H2O

the equilibrium constant Kc has the units

  • conc.+10

  • conc.+1

  • conc.-1

  • it is dimensionless


3.

The correct order of decreasing first ionisation energy is

  • C > B > Be > Li

  • C > Be > B > Li

  • B > C > Be > Li

  • Be > Li > B > C


4.

Consider the following reaction,

C6H5NO2 Sn / HCl X C6H5COCl Y + HCl

What is Y?

  • Acetanilide

  • Benzinilide

  • Azobenzene

  • Hydrazobenzene


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5.

The most basic element is

  • fluorine

  • iodine

  • chlorine

  • bromine


B.

iodine

The basic nature of elements increases from top to bottom in a group. Therefore, iodine is the most basic element.

F2 < Cl2 < Br2 < I2


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6.

Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?

  • Ag+

  • Cu2+

  • Cd2+

  • Pb2+


7.

Argol, a brown crust, formed during the fermentation of grape juice contains

  • CO2

  • fused oil

  • potassium hydrogen tartarate

  • lye


8.

The pH value of 0.001 M aqueous solution of NaCl is

  • 7

  • 4

  • 11

  • unpredictable


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9.

Which buffer solution comprising of the following has its pH value greater than 7?

  • CH3COOH + CH3COONa

  • HCOOH + HCOOK

  • CH3COONH4

  • NH4OH + NH4Cl


10.

Which of the following has sp2-hybridisation?

  • C2H6

  • C2H4

  • BeCl2

  • C2H2


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