CBSE Question Paper 2019 (Set-2) Class 11 Chemistry MPVM Gangagurukulam

Duration: 3 hrs.

M.Marks: 70

General Instructions:

Q1 - 5 are of 1 marks each.

Q6 - 10 are of 2 marks each.

Q11-23 are of 3 marks each.

1. Q24 is of 4 marks.

Q25 - 27 are of 5 marks each.

BF₃ does not have proton but still acts as an acid. Why?

1. Write the IUPAC name of the following compound: Br - CH₂-CH=CH-COOH.

Arrange the following elements in the increasing order of electronegativity Si, C, P and N.

Give one example of disproportionation reaction.

1. What is the slope between PV and P at constant temperature?
2. What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water?

On the basis of VSEPR theory, explain the shape of ClF₆ and SF₄.

Complete the following reactions:

dry ether L 2CH₃Br + 2Na ——→

alc.ROH

1. CH₂CH₂CH₂Cl ──→

1. The equilibrium constant <math>K_D</math> for the thermal dissociation of <math>PCl_S</math> at 200° C is 1.6 atm. What is the pressure at which it is 50% dissociated?

Write short notes on:

1. Acid rain
2. Green house effect
3. The density of certain gaseous oxide at 1.5 bar pressure at 10°C is same as that of dioxygen at 20° C & 4.5 bar pressure. Calculate the molar mass of gaseous oxide.

1/3

1. What causes the temporary & permanent hardness of water? Explain one method for the removal of permanent hardness.
2. In an organic compound C, H & N are present in the 9: 1: 3.5 ratio by weight if molecular weight of the compound is 108, then calculate the molecular formula of the compound.
3. How would you account for the following:
4. Ti(NO₂)₃ acts as an oxidizing agent.
5. Although B - Cl has a dipole moment but still BCl3 is a non - polar molecule
6. Complete the following reaction:

<math>PbO_3 + NaOH \rightarrow</math>

1. i. Why is NF₃ pyramidal but BCl₃ is a non - polar molecule

1. Which d - orbital is involved in sp³d hybridisation?
2. Solubility of MgCl₂ much greater than MgF₂, Why?

1. Write balanced chemical equation for the reaction of potassium permanganate with oxalic acid & potassium dichromate with potassium iodide in acidic medium.
2. Explain why:
3. Electron affinity is positive when O changes into O².
4. Be has higher first I.E than B.

Cl has more negative electron gain enthalpy than F.

1. i. The electron configuration of a dipositive ion M²⁺ is 2, 8, 14 & it's mass number is 56. How many neutrons are present in It?
2. What Is the most probable radius for finding the electron in He⁺
3. What is the shape of the orbital with the value of l = 2 & m = 0?
4. i. What is the hybridisation of each carbon in <math>H_2C=C=CH_2</math>?
5. Show the polarization of carbon - magnesium bond in the following structure: CH₃-CH₂-CH₂-CH₂-MgX
6. Draw the possible resonance structures for <math>\text{CH}_3 - \overset{\bullet}{O} - CH = CH_3</math>
7. Explain the following terms:
8. Hund's rule

Heisenberg's Uncertainty Principle.

1. Quantum number
2. The combustion of 1 mole of benzene takes place at 298 K and 1 atm. After combustion

2/3