Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Equal volumes of three acid solutions of pH 3.4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture?

  • 1.11 x 10-4 M

  • 3.7 x 10-4

  • 3.7 x 10-3 M

  • 3.7 x 10-3 M

2181 Views

2.

The angular shape of ozone molecule (O3) consists of 

  • 1 sigma and 2 pi bonds

  • 2 sigma and 2 pi bonds

  • 1 sigma and 1 pi bonds

  • 1 sigma and 1 pi bonds

785 Views

3.

Which of the following are not state functions?
I) q + W
II) q
III) W
IV) H-TS

  • (I) and (IV)

  • (II) (III) and (IV)

  • (I), (II) and (III)

  • (I), (II) and (III)

639 Views

4.

If uncertanity in position and momentum are equal, then uncertaninty in velocity is 

  • fraction numerator 1 over denominator 2 straight m end fraction square root of straight h over straight pi end root
  • square root of fraction numerator straight h over denominator 2 straight pi end fraction end root
  • 1 over straight m square root of h over pi end root
  • 1 over straight m square root of h over pi end root
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5.

The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr(24) and Mn (25) is 

  • Cr > Mn> V > Ti

  • V > Mn > Cr >Ti

  • Mn > Cr> Ti >V

  • Mn > Cr> Ti >V

917 Views

6.

If a gas expands at constant temperature, it indicates that

  • the kinetic energy of molecules decrease

  • the pressure of the gas increases

  • the kinetic energy of molecules remains the same

  • the kinetic energy of molecules remains the same

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7.

For the gas phase, reaction,

PCl5 (g) ⇌ PCl3 (g) Cl2 (g)
Which of the following conditions are correct?

  • Δ H = 0 and ΔS > 0

  • ΔH >0 and ΔS > 0

  • Δ H < 0 and ΔS < 0

  • Δ H < 0 and ΔS < 0


B.

ΔH >0 and ΔS > 0

ΔH = ΔE + ΔnRT


Δn = number of moles of product - number of moles of reactants

ΔG = ΔH - TΔS

For a spontaneous process, ΔG must be negative


PCl5 (g) ⇌ PCl3 (g) Cl2 (g)
 In this  reaction
Δn = 2-1 = 1
Thus, ΔH is positive, ie, >0
If ΔH is positive, then  to maintain the value of ΔG negative, ΔS should be positive , ie, ΔS>0.

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8.

Number of moles of MnO4- required to oxidies one mole of ferrous oxalate completely in acidic medium will be 

  • 0.6 mole

  • 0.4 mole

  • 7.5 mole

  • 7.5 mole

407 Views

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9.

If the concentration of OH- ions in the reaction Fe(OH)3 (s)  ⇌ Fe3+ (aq) + 3OH-(aq) is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increase by 

  • 8 times

  • 16 times

  • 64 times

  • 64 times

1381 Views

10.

The sequence of ionic mobility in aqueous solution is 

  • K+ > Na+ > Rb+ > Cs+

  • Cs+ > Rb+ > K+ >Na+

  • Rb+ > K+> Cs+ > Na+

  • Rb+ > K+> Cs+ > Na+

675 Views

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