11th Chemistry Monthly Test - 4 ( Basic Concepts of Chemistry and Chemical Calculations )

MABS Institution

11th Chemistry Monthly Test - 4 ( Basic Concepts of Chemistry and Chemical Calculations )-Aug 2020

Time : 2.00 Hours

Part - A

Generic 5 - Answer All Question

Balance the following equations by ion electron method -
i) \({ KMn }O_{ 4 }+{ SnCl }_{ 2 }+HCI\longrightarrow MnCI_{ 2 }+{ SnCI }_{ 4 }+{ H }_{ 2 }O+KCI\)
ii) \({ C }_{ 2 }{ O }_{ 4 }^{ 2- }+{ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }\longrightarrow { Cr }^{ 3+ }+{ CO }_{ 2 }\) (in acid medium)
iii) \({ Na }_{ 2 }{ S }_{ 2 }{ O }_{ 3 }+{ I }_{ 2 }\longrightarrow { Na }_{ 2 }{ S }_{ 4 }{ O }_{ 6 }+NaI\)
iv) \(Zn+{ NO }_{ 3 }^{ - }\longrightarrow { Zn }^{ 2+ }+No\)

In a reaction, A + B₂ \(\longrightarrow \) AB₂, identify the limiting reagent if any in the following reaction mixtures
(i) 300 atoms of A + 200 molecules of B
(ii) 2 moles of A + 3 moles of B
(iii) 100 atoms of A + 100 molecules of B
(iv) 5 moles of A + 2.5 moles of B
(v) 2.5 moles of A + 5 moles of B

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

Distinguish between the following.
(i) Atomic and molecular mass
(ii) Atomic mass and atomic weight
(iii) Empirical and molecular formula
(iv) Moles and molecules.

Write note on decomposition reaction

The reaction between aluminum and ferric oxide can generate temperatures up to 3273 K and is used in welding metals. (Atomic mass of AC = 27 u atomic mass of O = 16 u )
2Al + Fe₂O₃ \(\longrightarrow \) Al₂O₃ + 2Fe; If in this process, 324 g of aluminum is allowed to react with 1.12 kg of ferric oxide
i) Calculate the mass of Al₂O₃ formed
ii) How much of the excess reagent is left at the end of the reaction?

Balance the following equations by oxidation number method
i) \({ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }+KI+{ H }_{ 2 }SO_{ 4 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ Cr }_{ 2 }({ SO }_{ 4 })+{ I }_{ 2 }+{ H }_{ 2 }O\)
ii) \({ K }Mno_{ 4 }+{ Na }_{ 2 }{ So }_{ 3 }\longrightarrow { MnO }_{ 2 }+{ Na }_{ 2 }{ So }_{ 4 }+KOH\)
iii) \(Cu+{ HNO }_{ 3 }\longrightarrow Cu\left( { NO }_{ 3 } \right) _{ 2 }+{ NO }_{ 2 }+{ H }_{ 2 }O\)
iv) \({ KMn }O_{ 4 }+{ H }_{ 2 }{ C }_{ 2 }{ O }_{ 4 }+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ MnSO }_{ 4 }+{ CO }_{ 2 }+{ H }_{ 2 }O\)

Explain displacement reaction.

A Compound on analysis gave Na = 14.31% S = 9.97% H= 6.22% and 0= 69.5% calculate the molecular formula of the compound if all the hydrogen in the compound is present in combination with oxygen as a water of crystallization. (molecular mass of the compound is 322).

Arrange the elements silver, Zinc and copper in the order of their decreasing electron releasing tendency and justify your arrangement with an appropriate experiment.

Write note on combination reaction.

Calculate the molar mass of the following compounds. -
i) urea [CO(NH₂)₂]
ii) acetone [CH₃ COCH₃]
iii) boric Acid [H₃BO₃]
iv) Sulphurci Acid [H₂SO₄]

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11th Chemistry Monthly Test - 4 ( Basic Concepts of Chemistry and Chemical Calculations )

MABS Institution

11th Chemistry Monthly Test - 4 ( Basic Concepts of Chemistry and Chemical Calculations )-Aug 2020

Part - A

Generic 5 - Answer All Question

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

Distinguish between the following. (i) Atomic and molecular mass (ii) Atomic mass and atomic weight (iii) Empirical and molecular formula (iv) Moles and molecules.

Write note on decomposition reaction

Explain displacement reaction.

A Compound on analysis gave Na = 14.31% S = 9.97% H= 6.22% and 0= 69.5% calculate the molecular formula of the compound if all the hydrogen in the compound is present in combination with oxygen as a water of crystallization. (molecular mass of the compound is 322).

Arrange the elements silver, Zinc and copper in the order of their decreasing electron releasing tendency and justify your arrangement with an appropriate experiment.

Write note on combination reaction.

Calculate the molar mass of the following compounds. - i) urea [CO(NH2)2] ii) acetone [CH3 COCH3] iii) boric Acid [H3BO3] iv) Sulphurci Acid [H2SO4]

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Tamilnadu Stateboardszs - Class

Distinguish between the following.
(i) Atomic and molecular mass
(ii) Atomic mass and atomic weight
(iii) Empirical and molecular formula
(iv) Moles and molecules.

Calculate the molar mass of the following compounds. -
i) urea [CO(NH₂)₂]
ii) acetone [CH₃ COCH₃]
iii) boric Acid [H₃BO₃]
iv) Sulphurci Acid [H₂SO₄]