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11th Chemistry Monthly Test - 1 ( Basic Concepts of Chemistry and Chemical Calculations )

MABS Institution

11th Chemistry Monthly Test - 1 ( Basic Concepts of Chemistry and Chemical Calculations )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Which one of the following is used as a standard for atomic mass.

₆C¹²
₇C¹²
₆C¹³
₆C¹⁴

Among the three metals, zinc, copper and silver, the electron releasing tendency decreases in the following order.

zinc >silver >copper
zinc >copper >silver
silver > copper >zinc
copper > silver > zinc

Assertion: When 4 moles of H₂ reacts with 2 moles of O₂ then 4 moles of water is formed.
Reason: O₂ will act as limiting reagent.

Both assertion and reason are true and reason is the correct explanation of assertion
Both assertion and reason are true but reason is not the correct explanation of assertion.
Only assertion is true but reason is false
Both assertion and reason are false.

Which of the following contain same number of carbon atoms as in 6 g of carbon-12.

7.5 g ethane
8 g methane
both (a) and (b)
none of these

Assertion: Equal volumes of all the gases do not contain equal number of atoms
Reason: Atom is the smallest particle which takes part in chemical reactions.

Both assertion and reason are correct and reason is the correct explantion for assertion
Both assertion and reason are correct but reason is not the correct explantion for assertion
Assertion is true but reason are false
Both assertion and reason are false

The solid state of matter is converted into gas by

sublimation
deposition
freezing
condensation

Identify disproportionation reaction

CH₄ + 2O₂ \(\longrightarrow\) CO₂+ 2H₂O
CH₄ + 4Cl₂ \(\longrightarrow\) CCl₄ + 4HCI
2F₂+ 2OH \(\longrightarrow\) 2F^-+ OF₂+ H₂O
2NO₂ + 2OH^- \(\longrightarrow\) NO^-₂ + NO^-₃ + H₂O

Which of the following statement(s) is/are not true about the following decomposition reaction.
2KClO₃ \(\longrightarrow\) 2KCl + 3O₂
(i) Potassium is undergoing oxidation
(ii) Chlorine is undergoing oxidation
(iii) Oxygen is reduced
(iv) None of the species are undergoing oxidation and reduction.

only (iv)
(i) and (iv)
(iv) and (iii)
All of these

One mole of Sulphuric acid contains _______oxygen atoms

4 x 10²³
4 x 6.023 x 10^-23
4 x 6.023 x 10²³
4 x 6.023 x 10³²

Assertion (A): In the reaction between potassium permanganate and potassium iodide, permanganate ions act as oxidising agent.
Reason (R): Oxidation state of manganese changes from +2 to +7 during the reaction.

Both A and R are true and R explains A
Both A and R are true but R does not explain A
A is true but R is false
Both A and R are false

Part - B

Generic 2 - Answer All Question

Balance the following equations by ion electron method - \({ C }_{ 2 }{ O }_{ 4 }^{ 2- }+{ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }\longrightarrow { Cr }^{ 3+ }+{ CO }_{ 2 }\) (in acid medium)

What do you understand by the term mole.

What do you understand by the term oxidation number?

Define relative atomic mass.

Balance the following equations by oxidation number method - \({ KMn }O_{ 4 }+{ H }_{ 2 }{ C }_{ 2 }{ O }_{ 4 }+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ MnSO }_{ 4 }+{ CO }_{ 2 }+{ H }_{ 2 }O\)
Calculate the molar mass of the following compounds. - acetone [CH₃ COCH₃]

Calculate the average atomic mass of naturally occurring magnesium using the following data

Isotope Istopic atomic mass Abundance(%)

Mg²⁴ 23.99 78.99

Mg²⁶ 24.99 10.00

Mg²⁵ 25.98 11.01

The density of carbon dioxide is equal to 1.965 kgm-³ at 273 K and 1 atm pressure. calculate the molar mass of CO₂

Calculate the molar mass of the following compounds. -boric Acid [H₃BO₃]

Balance the following equations by ion electron method \(Zn+{ NO }_{ 3 }^{ - }\longrightarrow { Zn }^{ 2+ }+No\)

Part - C

Generic 3 - Answer All Question

Calculate the number of atoms/molecules present in the following 1.8g of water

Calculate equivalent mass of the Magnesium hydroxide

How are 0.5 mol Na₂CO₃ and 0.50 M Na₂CO₃ different?

In a reaction x + y + Z₂ \(\longrightarrow \) xyz₂ identify the Limiting reagent if any, in the following reaction mixtures.
(a) 200 atoms of x +200 atoms of y + 50 molecules of z₂
(b) 1 mol of x + 1 mol of y + 3 mol of z₂
(c) 50 atoms of x + 25 atoms of y + 50 molecules of z₂
(d) 2.5 mol of x + 5 mol of y + 5 mol of z₂

State Avogadro's hypothesis.
Calculate the mass of the following: 1 atom of silver

Calculate the gram molecular mass of sugar having molecular formula C₁₂H₂₂O₁₁

The density of CO₂ =1.977kgm^-3 at STP. Calculate I the molecular mass of CO₂

Calculate the equivalent mass of bicarbonate ion.

Define atomicity.

Part - D

Generic 5 - Answer All Question

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

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) \(Zn+{ NO }_{ 3 }^{ - }\longrightarrow { Zn }^{ 2+ }+No\)

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]

Write note on decomposition reaction

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

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?

Write note on combination reaction.

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

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) \({ KMn }O_{ 4 }+{ H }_{ 2 }{ C }_{ 2 }{ O }_{ 4 }+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ MnSO }_{ 4 }+{ CO }_{ 2 }+{ H }_{ 2 }O\)

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