Pb(NO3)2 on heating gives a brown gas which undergoes dimerizati

Subject

Chemistry

Class

CBSE Class 12

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 Multiple Choice QuestionsShort Answer Type

1.

What is the reason fo the stability of colloidal sols ?

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2.

Given an example each of molecular solid and an ionic solid.

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3.

Pb(NO3)2 on heating gives a brown gas which undergoes dimerization on cooling ? Identify the gas.



Nitrogen dioxide gas evolved.
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4.

When coordination compound CoCl3.6NH3 is mixed with AgNO3, 3molesof AgCl is precipitated per mole of the compound. write
i) Structural formula of the complex
ii) IUPAC name of the complex

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5.

(i) Gas (A) is more soluble in water than Gas (B) at the same temperature which one of two gases will the higher value of K(Henry's constant) and why ?

(ii)In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?

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6.

Write the structures of the following:
i) BrF3
ii) XeF4

Or

What happens when:
i) SO2 gas is passed through an aqueous solution Fe3+ salt ?
ii) XeF4 reacts with SbF5 ?

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7.

For a reaction: straight H subscript 2 space plus Cl subscript 2 space rightwards arrow with hv on top space 2 HCl

rate =k

i) Write the order and molecularity of this reaction.
ii) Write the unit of k.

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8.

a) For the complex [Fe(H2O)6]3+, write the hybridization,magnetic character and spin of the complex.(At.number: Fe=26).

b) Draw one of the geometrical isomers of the complex [Pt(en)2Cl2]2+ which is optically inactive.

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9.

Give reasons:
i) SO2 is reducing while TeO2 is an oxidizing agent.
ii) Nitrogen does not form pentahalide.
iii) ICl is more reactive than I2

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10.

Calculate the boiling point of the solution when 4g of MgSO4 (M =120 g mol-1) was dissolved in 100g of water,assuming MgSO4 undergoes complete ionization.

(Kb for water =0.52 K kg mol-1)

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