Inorganic Chemistry Test

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Inorganic Chemistry Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a property of HCl gas?

A
It is lighter than air.

B
It is soluble in water.

C
It is poisonous.

D
It is tasteless.

Solution

Hydrogen chloride (HCl) is a colourless gas of strong odour. It condenses at -85°C (-121°F) and freezes at -114°C (-173°F). The gas is highly soluble in water; at 20°C (68°F), water will dissolve 477 times its own volume of hydrogen chloride. As a result of its great solubility, the gas fumes in moist air.
Question 2
1 / -0

SO₂ (Sulphur dioxide) is

A
a reducing agent

B
an oxidising agent

C
both reducing and oxidising agent

D
neither an oxidising agent nor a reducing agent

Solution

Any substance can act as an oxidising or reducing agent if one of the elements in the given compound is present in its intermediate oxidation state. Thus, during the reaction, it can either increase or decrease its oxidation number. For example, in SO₂, the oxidation number of sulphur is +4. In principle, S can have minimum oxidation number of -2 and maximum of +6. Therefore, S in SO₂ can either decrease or increase its oxidation number and hence can act both as an oxidising as well as reducing agent.
Question 3
1 / -0

Which of the following gases has pungent suffocating odour?

A
CO

B
CO₂

C
O₂

D
SO₂

Solution

Sulphur dioxide is a colourless gas with a pungent, suffocating odour. It is a dangerous air pollutant because it is corrosive to organic materials and it irritates the eyes, nose and lungs.
Question 4
1 / -0

Which of the following turns lime water milky?

A
CO

B
SO₂

C
O₂

D
Cl₂

Solution

SO₂ turns lime water milky, so does carbon dioxide.
Question 5
1 / -0

Why does newspaper turn yellow on prolonged exposure to atmosphere?

A
Due to oxidation

B
Due to the reaction of the ink with water vapours

C
Due to carbon accumulation

D
Due to nitrogen

Solution

Newspaper turns yellow on prolonged exposure to atmosphere because of oxidation. Paper is made from wood, which is made up mainly of white cellulose. Wood also has a lot of a dark substance in it called lignin, which ends up in the paper, too, along with the cellulose. The exposure of lignin to air and sunlight is what turns paper yellow.
Question 6
1 / -0

Which of the following is not a property of SO₂?

A
It decolourises bromine water.

B
It turns acidified potassium dichromate solution green.

C
It turns potassium permanganate solution pink.

D
It bleaches the colour of a wet flower.

Solution

Bromine water and potassium dichromate in the acidic medium are stronger oxidising agents and can oxdise SO₂.
The colour change with KMnO₄ will be pinkish violet to colourless.
SO₂ bleaches by reduction and acts as a temporary bleach for vegetable matter.
Question 7
1 / -0

What is the effect of H₂S on blood?

A
It destroys the nucleus of the blood cells.

B
It destroys the haemoglobin in the blood.

C
It destroys the plasma membrane of the blood cells.

D
It reacts with haemoglobin and forms sulphoxy haemoglobin.

Solution

H₂S destroys the haemoglobin in the blood.
Question 8
1 / -0

At what temperature does the thermal decomposition of H₂S get completed?

A
310°C

B
770°C

C
1000°C

D
273°C

Solution

At 770°C temperature, the thermal decomposition of H₂S is completed.
Question 9
1 / -0

Which of the following is not a characteristic property of H₂S?

A
Rotten egg's smell

B
Turns lead acetate paper black

C
Strong oxidising agent

D
Decolourises acidified KMnO₄solution

Solution

H₂S acts as a reducing agent.
Question 10
1 / -0

What is the chemical formula of Oleum?

A
H₂SO₄

B
H₂S₂O₇

C
Na₂SO₄.10H₂O

D
SO₂Cl₂

Solution

H₂S₂O₇ is the chemical formula of oleum.
Question 11
1 / -0

Which of the following is the boiling point of H₂SO₄?

A
338°C

B
770°C

C
473°C

D
127°C

Solution

The boiling point of H₂SO₄ is 338°C.
Question 12
1 / -0

Which of the following does not react with H₂SO₄ under any condition?

A
Na

B
Fe

C
Cu

D
Pt

Solution

Platinum is the most unreactive metal.Thus, it does not react with H₂SO₄ under any condition.
Question 13
1 / -0

Which of the following gases is evolved when H₂SO₄ reacts with metal sulphide?

A
SO₂

B
O₂

C
H₂S

D
SO₃

Solution

When H₂SO₄ reacts with metal sulphide, H₂S gas evolves.
Question 14
1 / -0

Which of the following products is formed with glucose when added in H₂SO₄ solution?

A
Black spongy mass of carbon rises up

B
White precipitates settle down

C
Reddish brown mass rises up

D
Black precipitates settle down

Solution

When glucose is added in H₂SO₄ solution, black spongy mass of carbon rises up.
Question 15
1 / -0

Which of the following statements is incorrect about sulphuric acid?

A
It reacts with barium chloride and forms white precipitates.

B
It releases SO₂ on heating with copper.

C
It forms H₂ gas on heating with NaCl.

D
It is used in the extraction of metals.

Solution

Statement 3 is incorrect because hydrogen gas does not evolve on reaction with sulphuric acid.
The following reaction takes place on reaction between them:
NaCl (s) + H₂SO₄ (l) -------> HCl (g) + NaHSO₄ (s)
Question 16
1 / -0

Assertion (A): Drinking water is chlorinated.
Reason (R): Chlorination makes water transparent, chemically rich and very nutritious.

A
Both A and R are true, and R is the correct explanation of A.

B
Both A and R are true but R is not a correct explanation of A.

C
A is true but R is false.

D
A is false but R is true.

Solution

Chlorination is the process which is used to kill certain bacteria and other microbes in water as chlorine is highly toxic. Thus, the given assertion is true, but reason is not correct.
Question 17
1 / -0

Heavy water is

A
D₂O

B
H₂O along with Ca, Mg, carbonate

C
H₂O₂

D
Sea water (H₂O + Salt)

Solution

D₂O is known as heavy water.
Question 18
1 / -0

Nitrogen was discovered by

A
Scheele

B
Lavoisier

C
Daniel Rutherford

D
Cavendish

Solution

Nitrogen was discovered by Daniel Rutherford.
Question 19
1 / -0

Substances burn more rapidly in pure oxygen than in air because

A
air contains helium

B
air has a lower concentration of oxygen than pure oxygen

C
air contains methane

D
air contains ozone

Solution

Substances burn more rapidly in pure oxygen than in air because air has a lower concentration of oxygen than pure oxygen.
Question 20
1 / -0

Oxygen is prepared on a large-scale from

A
potassium permanganate

B
air

C
water

D
sodium peroxide

Solution

Oxygen is prepared on a large-scale from air.

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Inorganic Chemistry Test - 7

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Inorganic Chemistry Test - 7

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Question 1

It is lighter than air.

It is soluble in water.

It is poisonous.

It is tasteless.

Solution

Question 2

a reducing agent

an oxidising agent

both reducing and oxidising agent

neither an oxidising agent nor a reducing agent

Solution

Question 3

CO

CO2

O2

SO2

Solution

Question 4

CO

SO2

O2

Cl2

Solution

Question 5

Due to oxidation

Due to the reaction of the ink with water vapours

Due to carbon accumulation

Due to nitrogen

Solution

Question 6

It decolourises bromine water.

It turns acidified potassium dichromate solution green.

It turns potassium permanganate solution pink.

It bleaches the colour of a wet flower.

Solution

Question 7

It destroys the nucleus of the blood cells.

It destroys the haemoglobin in the blood.

It destroys the plasma membrane of the blood cells.

It reacts with haemoglobin and forms sulphoxy haemoglobin.

Solution

Question 8

310°C

770°C

1000°C

273°C

Solution

Question 9

Rotten egg's smell

Turns lead acetate paper black

Strong oxidising agent

Decolourises acidified KMnO4 solution

Solution

Question 10

H2SO4

H2S2O7

Na2SO4.10H2O

SO2Cl2

Solution

Question 11

338°C

770°C

473°C

127°C

Solution

Question 12

Na

Fe

Cu

Pt

Solution

CO₂

O₂

SO₂

SO₂

O₂

Cl₂

Decolourises acidified KMnO₄solution

H₂SO₄

H₂S₂O₇

Na₂SO₄.10H₂O

SO₂Cl₂

SO₂

O₂

H₂S

SO₃

It releases SO₂ on heating with copper.

It forms H₂ gas on heating with NaCl.

D₂O

H₂O along with Ca, Mg, carbonate

H₂O₂

Sea water (H₂O + Salt)