Multiple Choice QuestionsWhich of the following is arranged in the increasing order of enthalpy of vaporization?
NH3, PH3, AsH3
AsH3, PH3, NH3
NH3, AsH3, PH3
PH3, AsH3, NH3
D.
PH3, AsH3, NH3
The inter-particle forces are strongest in NH3 (Hydrogen bonds). In PH3 and AsH3 the inter-particle forces are dipole-dipole forces which are relatively stronger in AsH3. So the increasing order of enthalpy of vaporization is PH3< AsH3<NH3 .
Assertion: HClO4 is a stronger acid than HClO3.
Reason : Oxidation state of Cl in HClO4 is +8 and in HClO3 +5.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion : Sb (II) is not precipitated as sulphide when in its alkaline solution H2S is passed.
Reason : The concentration of S2- ion in alkaline medium is inadequate for precipitation.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion : Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate AgBr rather than AgCl.
Reason : Ksp of AgCl < Ksp of AgBr.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Sulphuryl chloride (SO2Cl2) reacts with white phosphorus (P4) to give
PCl5, SO2
OPCl3, SOCl2
PCl5, SO2, S2Cl2
OPCl3, SO2, S2Cl2
Which of the following order of basic strength is correct?
NH3 < NH2OH < HN3 < NH2-NH2
NH2OH <HN3 <NH2-NH2 <NH3
HN3 <NH3 <NH2OH <NH2-NH2
HN3 <NH2OH <NH2-NH2<NH3
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