What is the solubility of silver bromide in one litre of 0.4 mola

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The standard enthalpy of vapourisation Δvap H° for water at 100°C is 40.66 kJ mol-1. The internal energy of vapourisation of water 100°C (in kJ mol-1) is (assume water vapour to behave like an ideal gas).

  • + 4376

  • +40.66

  • +37.56

  • None of these


2.

The wavelength of associated wave of a particle moving with a speed of one-tenth that of light is 7Å. The particle must be

  • electron

  • proton

  • nanoparticle

  • photon


3.

Which mathematical statement did not prove false?

  • E= hv

  • R=me48ε02h3c

  • R=n12n22v(n12-n22)c

  • mvr= nh2π


4.

The bond order in CN- ion is

  • 2.5

  • 3

  • 2

  • 3.5


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5.

Np93239 is a β- emitter, but the product is also radioactive and give 235U. Which particles(s) is/ are emitted by the product?

  • 4 neutrons

  • 4 protons

  • 4 protons and 2electrons

  • 2 neutrons and 2 protons


6.

If the adsorption of a gas on solid metal surface is spontaneous and exothermic, then

  • H increases

  • S increases

  • G increases

  • S decreases


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7.

What is the solubility of silver bromide in one litre of 0.4 molar NH3 solution (K =10x108)?

  • 80 × 10-6 mol

  • 2.8 × 10-3 mol

  • 115 × 10-3 mol

  • 0.98 g


C.

115 × 10-3 mol

Let solubility by AgBr be x M Thus, [Br] = xM and [Ag+] = yM as Ag+ react with NH3 to form a examples

  AgBr  Ag+(a) + Br(aq)Ksp= [Ag+][Br-] = yxSmee, the formation constant (Kf) of the complex is very high, assume thatwhole Ag+ formed is consumed.Ag+ + 2NH3  Ag(NH3)2+x            0.4            0.4-2x        xAg(NH3)2+  Ag+(aq) + 2NH3   x                                        0.4-2xx-y                 y                  0.4-2x+2yKd=Ag+NH32Ag(NH3)2+ =y(0.4-2x+2y)2x-yx - y = x since Kd(1 ×10-8 is low ) and x<<0.4Kd(1 ×10-8)=y(0.4)2xsolving for x then x=115 × 10-3M


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8.

Which expression has no physical significance?

  • GTp

  • GpT

  • (G)Tp

  • (G)pT


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9.

4.9 g of H2SO4 is present in 100 mL solution. The molarity and normality of the solution will be

  • Molarity = 1M, Normality= 0.5N

  • Molarity = 1M, Normality= 0.25N

  • Molarity = 0.5M, Normality= 1N

  • Molarity = 2M, Normality= 3N


10.

0.0833 mole of a carbohydrate of empirical formula CH2O contains 1.00 g of hydrogen. The molecular formula of the carbohydrate is.

  • C5H10O5

  • C3H4O3

  • C12H22O11

  • C6H12O6


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