12th Chemistry Important 2 Mark Question Paper

St. Britto Hr. Sec. School - Madurai

12th Chemistry Important 2 Mark Question Paper-Aug 2020

Time : 1.00 Hours

Part - A

Generic 2 - Answer All Question

Define neutralisation reaction.

A first order reaction has a specific reaction rate of 10^-3 S^-1. How much time will it take for 10gm of the reactant to reduce to 2.5 gm?

A current of 1.608A is passed through 250 mL of 0.5 M solution of copper sulphate for 50 minutes. Calculate the strength of Cu²⁺ after electrolysis assuming volume to be constant and the current efficiency is 100%.

The K_a value for HCN is 10^-9. What is the pH of 0.4 M HCN solution?

State Faraday’s Laws of electrolysis

Write a note on vulcanization of rubber.

Why does ozone act as a powerful oxidising agent?

What are lyophilic colloids? Give example

Explain the effect of catalyst on reaction rate with an example

What is an elementary reaction? Give the differences between order and molecularity of a reaction

What are the factors affecting adsorption?

On dilution of 0.1 M of Na₂SO₄, what will happen to its

(a) Conductance (C)
(b) Conductivity k
(c) Molar conductance \({ \Lambda }_{ m }\)
(d) Equivalent conductance \({ \Lambda }\)

Why is FeS not formed in stoichiometric composition?

Name the type of isomerism that occurs in complexes in which both cation and anion are complex ions.

Why do solids have a definite volume?

Explain why ethylamine is stronger than anunonia?

When benzarnide is treated with bromine and alkali gives compound A. Also when
benzarnide is reduced by LiAIH₄, compound B is formed. Find A and B. Write the
equations.

Can aniline be prepared by Gabriel phthalimide reaction? Justify your answer.

Complete the reaction and write the names of products. \({ C }_{ 2 }{ H }_{ 5 }{ OH+NH }_{ 3 }\xrightarrow [ 360°C ]{ { Al }_{ 2 }{ O }_{ 3 } } ?\)

When aqueous ammonia is added to CuSO₄ solution, the solution turns deep blue due to the formation of tetramminecopper (II) complex, [Cu(H₂O)₄]_(aq)²⁺ + 4NH₃(aq) \(\rightleftharpoons \) [Cu(NH₃)₄] _(aq)²⁺, among H₂O and NH₃ Which is stronger Lewis base.

Describe the electrolysis of molten NaCl using inert electrodes

In fuel cell H₂ and O₂ react to produce electricity. In the process, H₂ gas is oxidised at the anode and 0₂ at cathode. If 44.8 litre of H₂ at 25°C and 1 atm pressure reacts in 10 minutes, what is average current produced? If the entire current is used for electro deposition of Cu from Cu²⁺, how many grams of Cu deposited?

Two electrodes having cross sectional area of A and are separated by a distance l. What is the ratio oflength by area called?

Name the two steps involved in the extraction of crude metal

Derive integrated rate law for a zero order reaction A\(\longrightarrow \) product

Why are colloids purified?

What are the uses of boron trifluoride?

Give two important characteristics of physiscorption.

What are drugs? How are they classified.

Ionic conductance at infmite dilution of AI³⁺ and \({ SO }_{ 4 }^{ 2- }\) are 189 and 160 mho cm² equiv^-1Calculate the equivalent and molar conductance of the electrolyte Al₂(SO₄)₃ at infinite dilution.

Comment

Add Comment

InstaQB

Institutions

12th Standard English Medium

12th Standard Tamil Medium

11th Standard English Medium

11th Standard Tamil Medium

10th Standard English Medium

9th Standard English Medium

8th Standard English Medium

7th Standard English Medium

Class XII

Class XI

12Th Standard

11Th Standard

10Th Standard

9Th Standard

12th Chemistry Important 2 Mark Question Paper

St. Britto Hr. Sec. School - Madurai

12th Chemistry Important 2 Mark Question Paper-Aug 2020

Part - A

Generic 2 - Answer All Question

Define neutralisation reaction.

A first order reaction has a specific reaction rate of 10-3 S-1. How much time will it take for 10gm of the reactant to reduce to 2.5 gm?

A current of 1.608A is passed through 250 mL of 0.5 M solution of copper sulphate for 50 minutes. Calculate the strength of Cu2+ after electrolysis assuming volume to be constant and the current efficiency is 100%.

The Ka value for HCN is 10-9. What is the pH of 0.4 M HCN solution?

State Faraday’s Laws of electrolysis

Write a note on vulcanization of rubber.

Why does ozone act as a powerful oxidising agent?

What are lyophilic colloids? Give example

Explain the effect of catalyst on reaction rate with an example

What is an elementary reaction? Give the differences between order and molecularity of a reaction

What are the factors affecting adsorption?

On dilution of 0.1 M of Na2SO4, what will happen to its (a) Conductance (C) (b) Conductivity k (c) Molar conductance \({ \Lambda }_{ m }\) (d) Equivalent conductance \({ \Lambda }\)

Why is FeS not formed in stoichiometric composition?

Name the type of isomerism that occurs in complexes in which both cation and anion are complex ions.

Why do solids have a definite volume?

Explain why ethylamine is stronger than anunonia?

When benzarnide is treated with bromine and alkali gives compound A. Also when benzarnide is reduced by LiAIH4, compound B is formed. Find A and B. Write the equations.

Can aniline be prepared by Gabriel phthalimide reaction? Justify your answer.

Complete the reaction and write the names of products. \({ C }_{ 2 }{ H }_{ 5 }{ OH+NH }_{ 3 }\xrightarrow [ 360°C ]{ { Al }_{ 2 }{ O }_{ 3 } } ?\)

When aqueous ammonia is added to CuSO4 solution, the solution turns deep blue due to the formation of tetramminecopper (II) complex, [Cu(H2O)4](aq)2+ + 4NH3(aq) \(\rightleftharpoons \) [Cu(NH3)4 ] (aq)2+, among H2O and NH3 Which is stronger Lewis base.

Describe the electrolysis of molten NaCl using inert electrodes

Two electrodes having cross sectional area of A and are separated by a distance l. What is the ratio oflength by area called?

Name the two steps involved in the extraction of crude metal

Derive integrated rate law for a zero order reaction A\(\longrightarrow \) product

Why are colloids purified?

What are the uses of boron trifluoride?

Give two important characteristics of physiscorption.

What are drugs? How are they classified.

Ionic conductance at infmite dilution of AI3+ and \({ SO }_{ 4 }^{ 2- }\) are 189 and 160 mho cm2 equiv-1 Calculate the equivalent and molar conductance of the electrolyte Al2(SO4)3 at infinite dilution.

Comment

Other Study material

12th Chemistry Weekly Test - 3 ( Chemistry in Ever

12th Chemistry Weekly Test - 1 (Hydroxy Compounds

12th Chemistry Monthly Test - 3 ( Surface Chemistr

12th Chemistry Weekly Test - 4 ( Hydroxy Compounds

12th Chemistry Weekly Test - 3 ( Hydroxy Compounds

12th Chemistry Weekly Test - 2 ( Hydroxy Compounds

12th Chemistry weekly Test - 4 ( Electro Chemistry

12th Chemistry Monthly Test - 1 ( Electro Chemistr

12th Chemistry Monthly Test - 2 ( Electro Chemistr

12th Chemistry Monthly Test - 3 ( Electro Chemistr

12th Chemistry Weekly Test - 1 ( Surface Chemistry

12th Chemistry Weekly Test - 2 ( Surface Chemistry

12th Chemistry Weekly Test - 3 ( Surface Chemistry

12th Chemistry Weekly Test - 4 ( Surface Chemistry

12th Chemistry Monthly Test - 1 (Surface Chemistry

Tamilnadu Stateboardszs - Class

A first order reaction has a specific reaction rate of 10^-3 S^-1. How much time will it take for 10gm of the reactant to reduce to 2.5 gm?

A current of 1.608A is passed through 250 mL of 0.5 M solution of copper sulphate for 50 minutes. Calculate the strength of Cu²⁺ after electrolysis assuming volume to be constant and the current efficiency is 100%.

The K_a value for HCN is 10^-9. What is the pH of 0.4 M HCN solution?

On dilution of 0.1 M of Na₂SO₄, what will happen to its

(a) Conductance (C)
(b) Conductivity k
(c) Molar conductance \({ \Lambda }_{ m }\)
(d) Equivalent conductance \({ \Lambda }\)

When benzarnide is treated with bromine and alkali gives compound A. Also when
benzarnide is reduced by LiAIH₄, compound B is formed. Find A and B. Write the
equations.

When aqueous ammonia is added to CuSO₄ solution, the solution turns deep blue due to the formation of tetramminecopper (II) complex, [Cu(H₂O)₄]_(aq)²⁺ + 4NH₃(aq) \(\rightleftharpoons \) [Cu(NH₃)₄] _(aq)²⁺, among H₂O and NH₃ Which is stronger Lewis base.

Ionic conductance at infmite dilution of AI³⁺ and \({ SO }_{ 4 }^{ 2- }\) are 189 and 160 mho cm² equiv^-1Calculate the equivalent and molar conductance of the electrolyte Al₂(SO₄)₃ at infinite dilution.