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11th Chemistry Weekly Test - 3 ( Basic Concepts of Chemistry and Chemical Calculations )

MABS Institution

11th Chemistry Weekly Test - 3 ( Basic Concepts of Chemistry and Chemical Calculations )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

The oxidation state of a element in its uncombined state is

zero
+1
-1
none

The oxidation number of hydrogen in LiH is _____________

+1
-1
+2
-2

Which of the following is/are true with respect to carbon -12

relative atomic mass is 12 u
the oxidation number of carbon is +4 in all its compounds.
1 mole ofcarbon-12 contain 6.022 x 10²² carbon atoms.
All of these

Calculate the percentage of N in ammonia molecule.

121.42%
28.35%
82.35%
28.53%

The characteristic feature of orderly arrangement of molecules belongs to

Solids
Liquid
Gases
None of these

The volume occupied by any gas at S.T.P. is_____

22.4 litres
2.24 litres
224 litres
0.224 litres

The number of water molecules in a drop of water weighing 0.018 g is

6.022 x 10²⁶
6.022 x10²³
6.022 x 10²⁰
9.9 x 10²²

Assertion: The number of oxygen atoms in 16g of oxygen and 16g of ozone is same
Reason Each of the species represent 1g atom of oxygen

Both assertion and reason are correct and the reason is the correct explanation for an assertion
Both assertion and reason are correct but a reason is not the correct explanation for assertion
Assertion is true but reason are false.
Both assertion and reason are false

In the reaction to NH₃ + H₂O \(\longrightarrow \) \({ NH }_{ 4 }^{ + }+O\overline { H } \), NH₃ is acidic in. the reason for its acidic is_____

Acceptance of one H+ from water
release of one OH^-ion
Due to the nitrogen atom
All the above

Which form of based on physical characteristics possess neither definite volume nor definite shape?

Solids
Liquids
Gases
Both (a) and (b)

Which one of the following represents 180g of water?

5 Moles of water
90 moles of water
\(\frac { 6.022\times { 10 }^{ 23 } }{ 180 } \) molecules of water
6.022 x 10²⁴molecules of water

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

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 (A): Among halogens fluorine is the best oxidant. Reason
(R): Fluorine is the most electronegative atom.

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

One 'U' stands for the mass of

An atom of carbon-12
1/12^th of the carbon-12
1/12th of a hydrogen atom
One atom of any of the element

What is the mass of precipitate formed when 50 ml of 8.5 % solution of AgNO₃ is mixed with 100 ml of 1.865 % potassium chloride solution?

3.59g
7g
14 g
28 g

Match list I with list II and identify the correct code.

List I List II

A Bronze 1 Element

B Table Salt 2 Homogeneous mixture

C Gold 3 Alloy

D Petrol 4 Compound

A B C D

1 4 2 3
A B C D

3 4 1 2
A B C D

2 3 4 1
A B C D

4 2 3 1

The equivalent mass of ferrous oxalate is __________.

\(\frac { molar\ mass\ of\ ferrousoxalate }{ 1 } \)
\(\frac { molar\ mass\ of\ ferrousoxalate }{ 2 } \)
\(\frac { molar\ mass\ of\ ferrousoxalate }{ 3 } \)
None of these

When 22.4 litres of H₂(g) is mixed with 11.2 litres of Cl₂(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to

2 moles of HCI (g)
0.5 moles of HCI (g)
1.5 moles of HCI (g)
1 moles of HCI (g)

Choose the disproportionation reaction among the following redox reactions.

3Mg_(s) + N_2(g) \(\longrightarrow \) Mg₃N_2(s)
P_4(s) + 3NaOH + 3H₂O \(\longrightarrow \) PH _3(g) + 3NaH₂ PO₂_(aq)
Cl_2(g) + 2Kl_(aq) \(\longrightarrow \) 2KCl_{(aq) +}I₂
Cr₂O_3(s) + 2A1_(s) \(\longrightarrow \) Al₂O₃(s) + 2Cr(s)

The oxidation number of Cr in Cr₂O₇^2- is __________

+6
-6
+7
-7

Identify the incorrect statement about a compound.

A molecule cannot be separated into its constituent elements by physical methods of separation
A molecule of a compound has atoms of different elements
A compound retains the physical properties of its constituent element
The ratio of atoms of different elements in a compound is fixed

An element X has the following isotopic Composition ²⁰⁰X = 90%, ¹⁹⁹X = 8% and ²⁰²X=2%The Weighted average atomic mass of the element X is closet to

201 u
202 u
199 u
200 u

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

What will be the basicity of H₃BO₃, which is not a protic acid?

One
Two
Three
Four

Rusting of iron articles is an example of ___________ reaction

Combustion
decomposition
reduction reaction and redox reaction
hydrolysis

1 amu (or) 1 u \(\approx \)

1.6605 x 10^-25 kg
1.6605 x 10^-26 kg
1.6605 x 10^-27 kg
1.6605 x 10^-28 kg

Assertion: The ash produced by burning paper in air is lighter than the original mass of paper.
Reason: he residue left after combustion of a chemical reaction tha t entities is always lighter

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

Fe2 + \(\longrightarrow\) Fe³⁺ + e^- is a ________ reaction.

redox
reduction
oxidation
decomposition

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour?

Cu + 2H₂SO₄ \(\longrightarrow \) CuSO₄ +SO₂ + 2H₂O
C + 2H₂ + SO₄ \(\longrightarrow \) CO₂ + 2SO₂ + 2H₂O
BaCl₂ + H₂SO₄ \(\longrightarrow \) BaSO₄ + 2HCl
None of the above

Total number of electrons present in 1.7 g of ammonia is

6.022 x 10²³
\(\frac { 6.022\times { 10 }^{ 22 } }{ 1.7 } \quad \)
\(\frac { 6.022\times { 10 }^{ 24 } }{ 1.7 } \)
\(\frac { 6.022\times { 10 }^{ 23 } }{ 1.7 } \)

In which of the following reactions, hydrogen peroxide acts as an oxidising agent?

I₂+ H₂O₂ + 20H^- \(\longrightarrow\) 21- + 2H₂O + O₂
PbS + 4H₂O₂ \(\longrightarrow\) PbSO₄ + 4H₂O
2MnO₄^-+ 3H₂O₂ \(\longrightarrow\) 2MnO₂ + 3O₂ + 2H₂O + 2OH^-
HOCI + H₂O₂ \(\longrightarrow\) H₂O⁺ + Cl^- + O₂

The solid state of matter is converted into gas by

sublimation
deposition
freezing
condensation

1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is ______________

0%
4.4%
16%
8.4%

Consider the following statements
i) Matter possesses mass.
ii) 22-carat gold is a mixture.
iii) Dry ice is a compound.
Which of the following statement(s) given above is/ are correct?

1 & 3
Only 1
1 & 2
1,2, & 3

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