For a chemical reaction, temperature is raised from 25° C to

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

A litre solution containing NH4Cl and NH4OH has hydroxide ion concentration of 10-6 mol L-1. Which of the following hydroxide could be precipitated when the solution is added to 1L solution of 0.1M metal ions?

Ba(OH)2 (Ksp = 5 x 10-3)

Ni(OH)2 (Ksp = 1.6 x 10-16)

Mn(OH)2 (Ksp = 2 x 10-13

Fe(OH)2 (Ksp = 8 x 10-16)

  • I and IV

  • III and IV

  • II and IV

  • II , III and IV


2.

Forty millilitre of CO was mixed 100 mL of O2 and the mixture was exploded. On cooling, the reaction mixture was shaken with KOH. What volume of gas is left?

  • 80 ml of O2

  • 60 ml of O2

  • 80 ml of CO2

  • 50 ml of CO2


3.

Consider the following pairs of ions:

I. Sc3+ and Ti4+        II. Mn2+ and Fe2+

III. Fe2+ and Co3+    IV. Cu+ and Zn2+

Among these pairs ofions, isoelectronic pairs would include:

  • II, III and IV

  • I, III and IV

  • I, II and IV

  • I, II and III


4.

The decreasing nucleophilicity of the following is:

I. CH3S-              II. CH3O-

III. -OH               IV. EtO-

  • II > III > 1V > I

  • III > IV > I > II

  • IV > III > I > II

  • II < I < IV < III


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5.

Arrange the following (I to IV) in the order of increasing masses:

I. 0.5 mole of O3

II. 0.5 g atom of oxygen

III. 3.011 x 1023 mlecules of O2

IV. 5.6 l of CO2 at STP

  • II < IV < III < I

  • IV < III < I < II

  • II < I < IV < III

  • I < II < III < IV


6.

The number of σ bonds in P4O10 is:

  • 6

  • 16

  • 7

  • 17


7.

One mole of FeC2O4 is oxidised by x moles of Cr2O72- in acidic medium , x is:

  • 0.5

  • 1.0

  • 1.5

  • 2.0


8.

10 moles of ideal gas expand isothermally and reversibly from a pressure of 10 atrn to 1 atm at 300K. What is the largest mass which can lifted through a height of 100 meter?

  • 48.75 kg

  • 58.55 kg

  • 75.64 kg

  • 64.13 kg


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9.

For a chemical reaction, temperature is raised from 25° C to 35° C. The value of equilibrium constant, Kp is doubled . The heat of reaction (ΔH) for the reaction will be :

  • 13.834 kcal

  • 11.714 kcal

  • 10.726 kcal

  • 4.312 kcal


C.

10.726 kcal

Given that , T1 = 25°C = 298 K
T1 = 35°C = 308 K

KP2KP1 = 2R = 2calK-1 mol-1

From van't Hoff equation ,

2.303log KP2KP1 = ΔHR T2 - T1T1T2

2.303 log 2 = ΔH2308 - 298308 × 298

or , ΔH = 12726 cal = 10.726 kcal


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10.

4.0 g molecular PCl5 were heated in a vessel of 6 L volume. At equilibrium state , 50% of PCl5 is dissociated. The equilibrium constant for the reaction is :

  • 0.66 mol L-1

  • 0.33 mol L-1

  • 0.44 mol L-1

  • 0.88 mol L-1


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