CBSE Class 11 Chemistry Question Paper Set 23 Solved

1. Arrange the following in the increasing order of decreasing stabilities:

CH₃CH₂⁺ , CH₃⁺ , (CH₃ )₃C⁺ , (CH₃)₂CH⁺

2. Out of H2O and H2S which has a higher boiling point and why? 

3. Why do elements in the same group have similar physical and chemical properties? 

4. What is a redox couple? 

5. Arrange the following in the increasing order of their bond angle:

CO₂ , SO₂ , NH₃ , H₂O

6. 2KMnO₄ + 16HCl → 2KCl + 2MnCl₂ + 8H₂O + 5Cl₂

If 1.58g of KMnO₄ is allowed to react with excess of HCl, Calculate

i) Number of moles of KCl formed
ii) Volume of Cl₂ produced at STP
(RAM of K = 39 , Mn = 55 , O = 16)

7. Correct the following IUPAC names if wrong:

i) But-4-ol-1-yne   ii) 2-Ethylpent-2-ene

8. If an electron is moving with a velocity of 600 m/s which is accurate upto 0.005%, then calculate the uncertainty in its position. (h = 6.63 x 10-34 Js and mass of electron = 9.1 x 10-31 Kg)

9. Write the cell reaction and calculate the standard E0 of the cell:
Zn/ Zn²⁺(1M) || Ag⁺(1M)/ Ag

E⁰Zn²+/Zn= ─ 0.763 V and E⁰Ag⁺/Ag= +0.80V

OR

i) Using stock notation , represent the following compounds:
a) Fe₂O₃
b) HAuCl₄
ii) Can the reaction,

Cr₂O₇^2- + H₂O ⇋ 2CrO₄^2- + 2H⁺ ,be regarded as a redox reaction? Give reason.

10. i) Show by a chemical reaction with water that Na2O is a basic oxide.
ii) What is the oxidation state and covalency of Al in [AlCl(H₂O)₅]²⁺

11. Define the following :
i) Law of definite proportion
ii) Gay Lussac law
iii)Formula mass.

12. Permanganate ion (MnO₄^─) reacts with bromide ion (Br ^─) in basic medium to give manganese dioxide (MnO2) and bromate ion (BrO₃^─). Write the balanced chemical equation for the reaction.

13. i) Write the structural formula of 2,3- Dibromo-1-phenylpentane.
ii) A substance has boiling point 350 K, but it starts decomposing near this temperature. Which type of distillation process is suitable for its purification?
iii) Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

14. i) Under what conditions do real gases tend to show ideal gas behavior?
ii) The size of weather balloon becomes larger as it ascends into higher altitude. Why?
iii) Define Boyle temperature.

OR

i) Name the intermolecular force existing between
a) He atoms in liquid helium
b) CO₂ and H₂O
ii) Why do real gases deviate from ideal behavior?
iii) Write the real gas equation for ‘n’ moles of a gas.

15. i) Give the values of all the quantum numbers for 19th electron of Cr (Z = 24).
ii) What are Balmer series?
iii) Define an orbital.

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