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Guess Paper
Class – XII
Subject – CHEMISTRY
Questions from p-block (ISC)
Q1.SF6 is known but SH6 is not known. Explain
Q2. Why does sulphur in vapour state exhibit paramagnetic behavior?
Q3. Why is H2O a liquid while H2s is a gas at room temperature.
Q4. Why is SF6 inert while SF4 and SeF6 are hydrolysed readily ?
Q5. Thermal stability of group 16 hydrides down the group from H2O to H2P0 . give
reasons.
Q6. Why are halogens strong oxidizing agents ?
Q7. Why are halogens coloured ?
Q8. Give the formula of noble gas species which is isostructural with ICl4-
Q9. Why do noble gas have comparatively large atomic sizes.
Q10. Bond dissociation energy of F2 is less than that of Cl2 .
Q11. The negative value of electron gain enthalpy of F is less than that of
chlorine.
Q12. How are XeO3 and XeOF4 prepared? Describe their molecular shapes.
Q13. How are XeF2, XeF4 and XeF6 prepared ?
Q14. Draw the structure of XeOF4 ,H2S2O7 & H2S2O8.
Q15. Find the oxidation state of
a) Cl in Cl2O
b) Cl in ClO2
c) Br in KBrO3
d) Cl inNaClO4
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Q16. Why is ICl more reactive than I2 ?
Q17. Draw structure of
a) XeOF2 b) XeF2
Q18. Write balanced equation for the following
a) NaCl is heated with sulphuric acid in presence of MnO2
b) Chlorine gas is passed into a solution of NaI in water
c) SiO2 is treated with HF
d) NaClO3 is treated with SO2
e) Iodine is treated with conc. HNO3
Q19. Arrange the following in the order of property indicated for each set:
a) F2 ,Cl2 ,Br2 ,I2 :- increasing bond energy
b) HF, HCl, HBr, HI :- increasing acid strength
c) H2O, H2S, H2Se, H2Te: – increasing acid strength.
Q20. How does ammonia react with the solution of Cu2+.
Q21. Name two poisonous gases which can be prepared from chlorine gas.
Q22.ClF3 exists but FCl3 does not. Explain.
Q23. Balance and complete the following reaction
XeF4 + SbF5
Q24. Bleaching action of chlorine is permanent while that of sulphur dioxide is
temporary. Explain.
\Q25.Why is dioxygen a gas but sulphur a solid?
Q26. Which aerosols deplete ozone?
Q27. Write two uses of ClO2.
Q28. Electro negativity of chlorine and oxygen are nearly same but oxygen forms
hydrogen bonding chlorine does not. Why?
Q29. Which one of the following does not exist?
a) XeOF4 b) NeF2 c) XeF2 d) XeF6
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Q30. How is SO2 an air pollutant?
Q31. How can you prepare Cl2 from HCl and HCl from Cl2 .Give reactions only?
Q32.With what neutral molecule is ClO – is isoelectronic? Is that molecule a
Lewis base?
Q 33. Describe the manufacture of Sulphuric acid by Contact process.
Q34. Write structural formulae of
a) IF5 b) IF7
Q35. Predict the shape of ClF3 on the basis of VSEPR theory.
Rahul Chemistry Classes
Name Arvind kumar chaudhry
Email [email protected]
Phone No. 9259638876
