Np93239 is a β- emitter, but the product

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


D.

2 neutrons and 2 protons

On emission of a β  from the nucleus, the new element formed possesses the same atomic mass but nuclear charge or atomic number is increased by one unit over the parent element followmg reaction takes place.

     Np93239 -β Z94239

Number of protons in U-235 = 92

Product has an atomic number two units less than Z94239 and a mass number four units less than Z94239.

Hence, Z emits an alpha (α)  particle which contain 2 protons and 2 neutrons.

 Z94239 -(2p and 2n)-α U23592


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6.

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

  • H increases

  • S increases

  • G increases

  • S decreases


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


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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