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


C.

n = 3; l = 2; m = -2; s = +12

In order to have highest energy level in an atom, n + l shoud be maximum. Therefore, option c is correct.


2.

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

  • CO2

  • fused oil

  • potassium hydrogen tartarate

  • lye


C.

potassium hydrogen tartarate

Argol consists of potassium hydrogen tartarate.


3.

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+


D.

Pb2+

Ammonia is a Lewis base. It forms complexes with transition elements like Ag+, Cu2+ and Cd2+ while it does not form complex with Pb2+ because Pb is not a transition element.

AgCl + 2NH4OH  [Ag(NH3)2]Cl + 2H2O

CuSO4 + 4NH4OH [Cu(NH3)4]SO4 + 4H2O

CdSO4 + 4NH4OH [Cd(NH3)4SO4 + 4H2O


4.

Consider the following reaction,

C6H5NO2 Sn / HCl X C6H5COCl Y + HCl

What is Y?

  • Acetanilide

  • Benzinilide

  • Azobenzene

  • Hydrazobenzene


B.

Benzinilide

In the above reaction, Y represents Benzinilide.


5.

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


B.

C > Be > B > Li

On moving from left to right in a period, as the size decreases, ionisation energy increases. But first I E of elements of II A group is higher than that of the elements of III A group because of the stable ns configuration (of II A group). Hence, the order of first ionisation energy is

C > Be > B > Li


6.

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


7.

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

  • CH3COOH + CH3COONa

  • HCOOH + HCOOK

  • CH3COONH4

  • NH4OH + NH4Cl


D.

NH4OH + NH4Cl

The pH value of basic buffer solutions is always greater than 7. Among the given, only NH4OH + NH4Cl constitutes the basic buffer (a mixture of weak base and its conjugated salt), thus, has pH greater than 7.


8.

The pH value of 0.001 M aqueous solution of NaCl is

  • 7

  • 4

  • 11

  • unpredictable


A.

7

NaCl is a neutral salt, thus the pH value of its aqueous solution is 7.


9.

Which of the following has sp2-hybridisation?

  • C2H6

  • C2H4

  • BeCl2

  • C2H2


B.

C2H4

When there are 3σ bonds, the hybridisation is sp2. The structures of the given compounds are

a. C2H

b. C2H-

c. BeCl2 -

d. C2H2


10.

For the homogeneous reaction,

4NH3 + 5O2  4NO + 6H2O

the equilibrium constant Kc has the units

  • conc.+10

  • conc.+1

  • conc.-1

  • it is dimensionless


B.

conc.+1

For the given reaction, ng = np - nr

(where, np = number of moles of gaseous products and nr = number of moles of gaseous reactants)

ng = (6 + 4) - (4 + 5) = +1

Units of Kc = (concentration)ng 

                = (concentration)+1