Question:
What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO2 ?
The p-Block Elements.
Q 1.
Write the reactions of F2 and Cl2 with water.
Q 2.
Match the formulas of oxides given in Column I with the type of oxide given in Column II and mark the correct option.
Q 3.
Write the order of thermal stability of the – hydrides of Group 16 elements.
Q 4.
Can PCl5 act as an oxidising as well as a reducing agent Justify.
Q 5.
Why are halogens coloured?
Q 6.
Match the compounds given in Column I with the hybridization and shape given in Column II and mark the correct option.
Q 7.
Write two uses of ClO2
Q 8.
Write balanced equations for the following:
(i) NaCl is heated witlrsulphuric acid in the presence of MnO2
(ii) Chlorine gas is passed into a solution of Nal in water.
Q 9.
Write a balanced equation for the hydrolytic reaction of PC is in heavy water.
Q 10.
How is the presence of SO2 detected ?
Q 11.
Give the resonating structures of N02 and N2O5.
Q 12.
Write two uses of ClO2
Q 13.
What are the oxidation states of phosphorus in the following: –
(i) H3PO3 (ii)PCl3
(iii) Ca3P2(iv)Na3PO4
(v) POF3
Q 14.
Write a balanced chemical equation, for the reaction showing catalytic oxidation of NH3 by atmospheric oxygen.
Q 15.
Why is BiH3 the strongest reducing agent amongst all the hydrides of group 15 elements? (C.B.S.E. 2013)
Q 16.
What happens when sulp’hur dioxide is passed through an aqueous solution of Fe(III) salt?
Q 17.
Write the conditions to maximise the yield of H2SO4 by Contact process.
Q 18.
Why does nitrogen show catenation properties less than phosphorus ? (C.B.S.E. Foreign 2009)
Q 19.
Why is dioxygen a gas but sulphur a solid?
Q 20.
Which one of the following does not exist ?
(i)XeOF4 (ii)NeF2
(iii)XeF4 (iv)XeF6
Q 21.
List the uses of neoirand argon gases.
Q 22.
Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidizing power.
Q 23.
Which of the following orders are correct as per the properties mentioned against each?
Q 24.
Give reason to explain why ClF3 exists but FCl3 does not exist.
Q 25.
Which of the following does not react with oxygen directly? Zn, Ti, Pt, Fe
Q 26.
How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions . involved.
Q 27.
The HNH angle value is higher than HPH, H AsH and HSbH angles. Why?
(Hint: Can be explained on the basis of sp3 hybridisation in NH3 and only s-p bonding , between hydrogen and other elements of the group).
Q 28.
Explain why NH3 is basic while BiH3 is only feebly basic.
Q 29.
Explain why inspite of nearly the same electronegativity, nitrogen forms hydrogen bonding while chlorine does not.
Q 30.
List the uses of neoirand argon gases.
Q 31.
Why is BiH3 the strongest reducing agent amongst all the hydrides of Group 15 elements?
Q 32.
Why is N2 less reactive at room temperature?
Q 33.
List the important sources of sulphur.
Q 34.
Write the order of thermal stability of the – hydrides of Group 16 elements.
Q 35.
Which of the following does not react with oxygen directly? Zn, Ti, Pt, Fe
Q 36.
How is O3 estimated quantitatively?
Q 37.
What happens when sulp'hur dioxide is passed through an aqueous solution of Fe(III) salt?
Q 38.
Comment on the nature of two S-O bonds formed in S02 molecule. Are the two S-O bonds in this molecule equal ?
Q 39.
Mention three areas in which H2SO4 plays an important role.
Q 40.
Why does NH3 form hydrogen bond but PH3 does not?
Q 41.
Illustrate how copper metal can give different products on reaction with HN03.
Q 42.
Explain why NH3 is basic while BiH3 is only feebly basic.
Q 43.
Nitrogen exists as diatomic molecule and phosphorus as P4. Why?
Q 44.
Why are halogens strong oxidising agents?
Q 45.
Explain why fluorine forms only one oxoacid, HOF.
Q 46.
Write the reactions of F2 and Cl2 with water.
Q 47.
What inspired N. Bartlett for carrying out reaction between Xe and PtF6?
Q 48.
With what neutral molecule is CIO– isoelectronic? Is that molecule a Lewis base?
Q 49.
How are XeO3 and XeOF4prepared?
Q 50.
Give the formula and describe the structure of a noble gas species which is isostructural with: (i) ICI4– (ii) IBr2– (iii) Br03–
