Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Which two gases are released on heating lead nitrate?

A
NO,O²

B
SO₂ ,O₂

C
NO₂,O₂

D
N₂O,O₂

Solution

Lead nitrate on heating decomposes to give nitrogen dioxide , yellow solids of lead oxide and oxygen gas
Question 2
1 / -0

Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be

A
red

B
blue

C
brown

D
green

Solution

CuSO₄ dissolves in water to give blue colour
Question 3
1 / -0

The colour of zinc metal is

A
white

B
Grey

C
Red dish brown

D
silvery

Solution

It is whitish or bluish grey in colour .
Question 4
1 / -0

Which one of the following will be required to identify the gas evolved when diluted HCl reacts with zinc metal?

A
Blue litmus solution

B
Red litmus solution

C
Lime water

D
A burning splinter

Solution

Zinc is a reactive metal which on reaction with HCl produces hydrogen gas, which burns with a pop sound.
Zn + 2HCl → ZnCl₂ + H₂ ↑
Question 5
1 / -0

Which of the following is not a balanced chemical equation?

A
Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g)

B
Mg(s) + CuSO₄(aq) → MgSO₄(aq) + Cu(s)

C
Fe(s) + Cl₂(g) → FeCl₂(s)

D
Ca(OH)₂(l) + CO2(g) → CaCO(s) + H₂O(l)

Solution

2Fe and 3 Cl₂ gives FeCl_3.
2 Fe(s) + 3 Cl₂(g) → 2 FeCl₃(s)
Question 6
1 / -0

Can we store CuSO₄ in iron container and why?

A
Yes, but only in winter

B
Yes

C
Yes, But only in summer

D
No

Solution

Reaction will take place between Fe and CuSO₄and Fe will displace Cu from CuSO₄
Question 7
1 / -0

The odour of SO₂ gas is

A
Pungent

B
Sweet smelling

C
Foul smelling

D
Odourless

Solution

Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO₂. It is a toxic gas with a pungent, irritating smell. It is released naturally by volcanic activity and is produced as a by-product of the burning of fossil fuels contaminated with sulfur compounds.
Question 8
1 / -0

Which of the following solution is obtained on reacting zinc metal with NaOH solution?

A
Na₃2NO₃

B
Zn(OH)2

C
Na₂ZnO₂

D
2NO

Solution

Zn + 2NaOH → Na₂ZnO₂ + H₂
Zinc react with sodium hydroxide to produce zincate sodium and hydrogen. This reaction takes place at a temperature near 550°C.
Question 9
1 / -0

ZnCO₃(s) undergoes ‘X’ to give ZnO + (CO₂). What does ‘X’ symbolized here?

A
Photo chemical decomposition

B
Electrolysis

C
displacement reactions

D
thermal decomposition

Solution

ZnCO₃heating decomposes to give ZnO and O₂
Question 10
1 / -0

Which of the following is the incorrect method of preventing rusting?

A
Iron articles should be covered with plastic

B
The iron articles should be painte

C
Galvanised iron pipes are used for water supply.

D
The machine parts should be oiled or greased

Solution

The most common method of preventing the rusting of iron is to coat its surface with paint or apply grease, oil or varnish. Rusting of iron can be prevented by galvanization. The process of depositing a thin layer of Zinc metal on Iron objects is called galvanization. Iron articles should be covered with plastic is the incorrect method of preventing rusting.

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Chemical Reactions and Equations Test - 8

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Chemical Reactions and Equations Test - 8

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Question 1

NO,O2

SO2 ,O2

NO2,O2

N2O,O2

Solution

Question 2

red

blue

brown

green

Solution

Question 3

white

Grey

Red dish brown

silvery

Solution

Question 4

Blue litmus solution

Red litmus solution

Lime water

A burning splinter

Solution

Question 5

Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)

Mg(s) + CuSO4(aq) → MgSO4(aq) + Cu(s)

Fe(s) + Cl2(g) → FeCl2(s)

Ca(OH)2(l) + CO2(g) → CaCO(s) + H2O(l)

Solution

Question 6

Yes, but only in winter

Yes

Yes, But only in summer

No

Solution

Question 7

Pungent

Sweet smelling

Foul smelling

Odourless

Solution

Question 8

Na32NO3

Zn(OH)2

Na2ZnO2

2NO

Solution

Question 9

Photo chemical decomposition

Electrolysis

displacement reactions

thermal decomposition

Solution

Question 10

Iron articles should be covered with plastic

The iron articles should be painte

Galvanised iron pipes are used for water supply.

The machine parts should be oiled or greased

Solution

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NO,O²

SO₂ ,O₂

NO₂,O₂

N₂O,O₂

Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g)

Mg(s) + CuSO₄(aq) → MgSO₄(aq) + Cu(s)

Fe(s) + Cl₂(g) → FeCl₂(s)

Ca(OH)₂(l) + CO2(g) → CaCO(s) + H₂O(l)

Na₃2NO₃

Na₂ZnO₂