11th Chemistry Important 5 Mark Question paper

St. Britto Hr. Sec. School - Madurai

11th Chemistry Important 5 Mark Question paper-Aug 2020

Time : 2.00 Hours

Part - A

Generic 5 - Answer All Question

Henry’s law constant for solubility of methane in benzene is 4.2 x 10^-5 mm Hg at a particular constant temperature At this temperature. Calculate the solubility of methane at i) 750 mm Hg ii) 840 mm Hg

(a) How is H₂O₂ prepared?
(b) Explain about the structure of H₂O₂

The heat of combustion of solid naphthalene (C₁₀H₁₀) at constant volume was -4984 kJ mol^-1at 298 K. Calculate the value of enthalpy change.
Given:
C₁₀H_8(s)+12O_2(g)➝ 10CO_2(g)+4H₂O(l)
\(\Delta U\)=-4984 kJ mol^-1
\(\Delta U\)=-4984 kJ mol^-1,R=8.314 JK^-1 mol^-1
T=298 K

Calculate the change of entropy for the process, water (liq)to water (vapor, 373 K) involving ΔH_vap = 40850J mort at 373 K.

Calculate the lattice energy of CaCl₂ from the given data
Ca_(s)+Cl_2(g) ➝ CaCl_2(s) ΔH_f^o=-795 KJ mol^-1
Atomisation : Ca_(s) ➝ Ca_(g) ΔH₁^o= +121 KJ mol^-1
Ionisation: Ca_(g) ➝ Ca₂++2e^- ΔH₂^o= +2422 KJ mol^-1
Dissociation : Cl_2(g) ➝ 2Cl_(g) ΔH₃^o= +242.8 KJ mol^-1
Electron affinity: Cl_(g)+e^- ➝ Cl^-_(g) ΔH₄^o= -795 KJ mol^-1

Explain the laboratory preparation of hydrogen.

Account for the following:
(i) Ozone layer is necessary for life.
(ii) The temperature of thermosphere is 1500°C but a person would not feel warm in it.
(iii) Smoking is harmful for pregnant latlies.
(iv) CO₂ keeps the earth warm.
(v) The pH of normal rain water is 5.6.

Discuss the inter conversions observed in the following functional groups.
(i) Alcohol
(ii) Alkyhalide
(iii) Alkyl cyanide

Explain about the general characteristics of periods.

A sealed container was filled with 1 mol of A₂ (g), 1 mol B₂ (g) at 800 K and total pressure 1.00 bar. Calculate the amounts of the components in the mixture at equilibrium given that K = 1 for the reaction
A₂ (g) + B₂ (g) ⇌ 2AB (g)

An organic compound (A) of a molecular formula C₆H₆ is a simple aromatic hydrocarbon. A reacts with O₂ in the presence of V₂O₅at 773 K to give B. A is further treated with sodium and liq id ammonia to give C which is a diene compound. Identify A, B, and C and explain the reactions.

Alkaline earth metal (A), belongs to 3rd period reacts with oxygen and nitrogen to form compound (B) and (C) respectively. It undergo metal displacement reaction with AgNO₃ solution to form compound (D).

SN₂reaction of an optically active haloalkane is accompanied by inversion of configuration at the asymmetric centre. Prove it.

Give the chemical properties of heavy water and water.

At 27°C temperature and 4 bar pressure CO is filled in 2 litre vessel. Find the pressure if it is filled in 4 litre vessel at 77 °C temperature.

A neon-di-oxygen mixture contains 70.6 g of di-oxygen and 167.5 g of neon. If the pressure of the mixture of gases in the cylinder is 25 bar, what is the partial pressure of di-oxygen and neon in the mixture? (Atomic mass of Ne=20u)

The enthalpy of combustion for H₂, C_(graphite)and CH₄ are -285.8, -393.5 and -890.4 kJ mol^-1respectively. Calculate the standard enthalpy of formation \(\Delta { H }_{ f }^{ 0 }\) for CH₄

An organic compound u24b6 of molecular formula C₃H₆ react with HBr in the presence of peroxide to give C₃H₇Br as u24b7, u24b7on reaction with aqueous KOH gives u24b8 with molecular formula C₃H₅O. Identify u24b6,u24b7 and u24b8

What are disproportionation reaction. What are auto redox reactions? Give an examples.

Give the uses of gypsum

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11th Chemistry Important 5 Mark Question paper

St. Britto Hr. Sec. School - Madurai

11th Chemistry Important 5 Mark Question paper-Aug 2020

Part - A

Generic 5 - Answer All Question

Henry’s law constant for solubility of methane in benzene is 4.2 x 10-5 mm Hg at a particular constant temperature At this temperature. Calculate the solubility of methane at i) 750 mm Hg ii) 840 mm Hg

(a) How is H2O2 prepared? (b) Explain about the structure of H2O2

The heat of combustion of solid naphthalene (C10H10) at constant volume was -4984 kJ mol-1 at 298 K. Calculate the value of enthalpy change. Given: C10H8(s)+12O2(g) ➝ 10CO2(g)+4H2O(l) \(\Delta U\)=-4984 kJ mol-1 \(\Delta U\)=-4984 kJ mol-1,R=8.314 JK-1 mol-1 T=298 K

Calculate the change of entropy for the process, water (liq)to water (vapor, 373 K) involving ΔHvap = 40850J mort at 373 K.

Explain the laboratory preparation of hydrogen.

Account for the following: (i) Ozone layer is necessary for life. (ii) The temperature of thermosphere is 1500°C but a person would not feel warm in it. (iii) Smoking is harmful for pregnant latlies. (iv) CO2 keeps the earth warm. (v) The pH of normal rain water is 5.6.

Discuss the inter conversions observed in the following functional groups. (i) Alcohol (ii) Alkyhalide (iii) Alkyl cyanide

Explain about the general characteristics of periods.

A sealed container was filled with 1 mol of A2 (g), 1 mol B2 (g) at 800 K and total pressure 1.00 bar. Calculate the amounts of the components in the mixture at equilibrium given that K = 1 for the reaction A2 (g) + B2 (g) ⇌ 2AB (g)

An organic compound (A) of a molecular formula C6H6 is a simple aromatic hydrocarbon. A reacts with O2 in the presence of V2O5at 773 K to give B. A is further treated with sodium and liq id ammonia to give C which is a diene compound. Identify A, B, and C and explain the reactions.

Alkaline earth metal (A), belongs to 3rd period reacts with oxygen and nitrogen to form compound (B) and (C) respectively. It undergo metal displacement reaction with AgNO3 solution to form compound (D).

SN2 reaction of an optically active haloalkane is accompanied by inversion of configuration at the asymmetric centre. Prove it.

Give the chemical properties of heavy water and water.

At 27°C temperature and 4 bar pressure CO is filled in 2 litre vessel. Find the pressure if it is filled in 4 litre vessel at 77 °C temperature.

A neon-di-oxygen mixture contains 70.6 g of di-oxygen and 167.5 g of neon. If the pressure of the mixture of gases in the cylinder is 25 bar, what is the partial pressure of di-oxygen and neon in the mixture? (Atomic mass of Ne=20u)

The enthalpy of combustion for H2, C(graphite) and CH4 are -285.8, -393.5 and -890.4 kJ mol-1respectively. Calculate the standard enthalpy of formation \(\Delta { H }_{ f }^{ 0 }\) for CH4

An organic compound u24b6 of molecular formula C3H6 react with HBr in the presence of peroxide to give C3H7Br as u24b7, u24b7on reaction with aqueous KOH gives u24b8 with molecular formula C3H5O. Identify u24b6,u24b7 and u24b8

What are disproportionation reaction. What are auto redox reactions? Give an examples.

Give the uses of gypsum

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Henry’s law constant for solubility of methane in benzene is 4.2 x 10^-5 mm Hg at a particular constant temperature At this temperature. Calculate the solubility of methane at i) 750 mm Hg ii) 840 mm Hg

(a) How is H₂O₂ prepared?
(b) Explain about the structure of H₂O₂

The heat of combustion of solid naphthalene (C₁₀H₁₀) at constant volume was -4984 kJ mol^-1at 298 K. Calculate the value of enthalpy change.
Given:
C₁₀H_8(s)+12O_2(g)➝ 10CO_2(g)+4H₂O(l)
\(\Delta U\)=-4984 kJ mol^-1
\(\Delta U\)=-4984 kJ mol^-1,R=8.314 JK^-1 mol^-1
T=298 K

Calculate the change of entropy for the process, water (liq)to water (vapor, 373 K) involving ΔH_vap = 40850J mort at 373 K.

Account for the following:
(i) Ozone layer is necessary for life.
(ii) The temperature of thermosphere is 1500°C but a person would not feel warm in it.
(iii) Smoking is harmful for pregnant latlies.
(iv) CO₂ keeps the earth warm.
(v) The pH of normal rain water is 5.6.

Discuss the inter conversions observed in the following functional groups.
(i) Alcohol
(ii) Alkyhalide
(iii) Alkyl cyanide

A sealed container was filled with 1 mol of A₂ (g), 1 mol B₂ (g) at 800 K and total pressure 1.00 bar. Calculate the amounts of the components in the mixture at equilibrium given that K = 1 for the reaction
A₂ (g) + B₂ (g) ⇌ 2AB (g)

An organic compound (A) of a molecular formula C₆H₆ is a simple aromatic hydrocarbon. A reacts with O₂ in the presence of V₂O₅at 773 K to give B. A is further treated with sodium and liq id ammonia to give C which is a diene compound. Identify A, B, and C and explain the reactions.

Alkaline earth metal (A), belongs to 3rd period reacts with oxygen and nitrogen to form compound (B) and (C) respectively. It undergo metal displacement reaction with AgNO₃ solution to form compound (D).

SN₂reaction of an optically active haloalkane is accompanied by inversion of configuration at the asymmetric centre. Prove it.

The enthalpy of combustion for H₂, C_(graphite)and CH₄ are -285.8, -393.5 and -890.4 kJ mol^-1respectively. Calculate the standard enthalpy of formation \(\Delta { H }_{ f }^{ 0 }\) for CH₄

An organic compound u24b6 of molecular formula C₃H₆ react with HBr in the presence of peroxide to give C₃H₇Br as u24b7, u24b7on reaction with aqueous KOH gives u24b8 with molecular formula C₃H₅O. Identify u24b6,u24b7 and u24b8