Metals And Non-metals Test

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Metals And Non-metals Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements are correct?

1. Metalloids are called semi-metals.
2. Metalloids are used as semi-conductors.
3. Metalloids are impure metals.
4. Metalloids are pure non-metals.

A
1 and 2

B
2 and 3

C
3 and 4

D
1 and 4

Solution

Metalloids are called semi-metals and are used as semi-conductors.
Question 2
1 / -0

Which of the following statements is incorrect?

A
Reaction of all alkali metals with water (at 25^oC) is highly vigorous.

B
Reactions of all alkaline earth metals with water (at 25^oC) is highly vigorous.

C
Nobel metals do not react with water.

D
Moderately reactive metals react only with steam.

Solution

Option (2) is incorrect as magnesium is an alkaline earth metal which does not react with cold water.
However, it reacts slowly to an insignificant extent with hot water but does react with steam.

Mg(s) + 2H₂O(g) MgO(s) + H₂(g)
Question 3
1 / -0

Transition metals exhibit properties like high melting point and high tensile strength because

A
they are electropositive elements

B
the constituent atoms are held together by strong forces of attraction

C
the atomic number is high and hence, charge on the nucleus is high

D
the valence electrons are strongly bound to the nucleus

Solution

The constituent atoms in the metals are held together by a strong force of attraction, called the metallic bond.
The melting points and tensile strength of metals depend on the strength of the metallic bond, which is high for transition metals.
Question 4
1 / -0

'X' and 'Y' are examples of acidic and neutral non-metallic oxides.

Choose from the options given below, the one that is a suitable illustration of 'X' and 'Y'.

A
CO₂, SO₂

B
N₂O, H₂O

C
P₂O₅, NO

D
SO₃, N₂O₅

Solution

CO₂, SO₂, P₂O₅, SO₃, and N₂O₅ are acidic oxides.
N₂O, H₂O, and NO are neutral oxides.

Question 5

1 / -0

Match Column - A (non-metal) with Column - B (with their uses).

Column - A	Column - B
(i) Phosphorus and nitrogen	(a) Essential for breathing
(ii) Iodine	(b) Disinfectant
(iii) Chlorine	(c) Essential for plant growth
(iv) Oxygen	(d) Antiseptic

(i) - (d), (ii) - (a), (iii) - (b), (iv) - (c)

(i) - (b), (ii) - (d), (iii) - (c), (iv) - (a)

(i) - (a), (ii) - (b), (iii) - (d), (iv) - (c)

(i) - (c), (ii) - (d), (iii) - (b), (iv) - (a)

Solution

All are correctly matched.
i. Phosphorous and nitrogen are important constituents of fertiliser, which is essential for plant's growth.
ii. Iodine mixed with alcohol acts as an antiseptic.
iii. Chlorine acts as a disinfectant.
iv. Oxygen is the most important part of our environment, which is essential for breathing of all living world.

Question 6
1 / -0

Consider the following physical properties:

(i) Low melting and boiling points
(ii) Formation of alloys and amalgams
(iii) Highly lustrous
(iv) Non-conductor of heat and electricity
(v) Low density

Which of the given physical properties are shown by sulphur and phosphorus?

A
(i), (iv) and (v)

B
(i), (iii) and (v)

C
(i), (ii) and (iii)

D
(ii), (iv) and (v)

Solution

Sulphur and phosphorus are non-metals and exhibit properties like low melting and boiling points, low densities and non-conductance of heat and electricity, which are characteristics of the non-metals.
Having lustre and formation of alloys are basically metallic properties.
Question 7
1 / -0

Metals have free electrons in their valence shells, and show electrical and thermal conductance. Which of the following elements is a poor conductor of electricity?

A
Lead

B
Sodium

C
Lithium

D
Graphite

Solution

Lead belongs to group 14 of the periodic table and has low electrical conductance due to the inert pair effect. This is a characteristic property of all post transition metals.
Lithium and sodium are reactive metals and have a high electrical conductivity; and graphite, though a non-metal, has a high electrical conductivity due to the presence of free electrons in its valence shell.
Question 8
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Which of the following represents the pairs of metalloids?

(a) Si and Sb
(b) Pb and Sb
(c) Ru and Rh
(d) Ge and As

A
(b) and (d)

B
(a) and (c)

C
(b) and (c)

D
(a) and (d)

Solution

In the periodic table, metalloids are B, Si, Ge, As, Sb, Tl and Po.
Question 9
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Metals are electropositive elements and their reactivity depends on their ability to lose one or more of their valence electrons. Which of the following properties is expected to increase the reactivity of the metals?

A
High ionisation energies

B
Bigger atomic radius

C
Greater number of valence electrons

D
Greater value of the effective nuclear charge

Solution

The higher the atomic radius, the lower will be the ionisation energy and the higher will be the ease with which the atom will lose an electron. Thus, the reactivity of the metals increases with increase in the atomic radius and decrease in the ionisation energies.
Question 10
1 / -0

Chromium has a higher melting point than manganese because

A
the number of unpaired electrons is greater in chromium

B
the atomic radius of chromium is smaller

C
Both (1) and (2)

D
Neither (1) nor (2)

Solution

The higher melting point of chromium is due to the greater strength of the metallic bond.
Strength of the metallic bond Number of valence electrons
Strength of the metallic bond Charge density on the metal kernel
Both the number of valence electrons and the charge density are higher in Cr than Mn.
Therefore, the metallic bond is stronger in chromium and it has a higher melting point.
Question 11
1 / -0

Gold is soluble in

A
HCI

B
HF

C
HBr

D
aqua regia

Solution

Noble metals like gold and platinum are soluble in aqua regia, which is a mixture of conc. HCl (3 parts) and HNO₃ (1 part).

HNO₃ + 3HCl 2[Cl] + NOCl + 2H₂O

Au + 3[Cl] AuCl₃

AuCl₃ + HCl H⁺[AuCl₄]^-
Question 12
1 / -0

Which of the following will not be formed when steam is passed over red-hot iron?

A
H₂

B
FeO

C
Fe₂O₃

D
Fe(OH)₂

Solution

Metal + H₂O(g) Metal oxide + H₂(g)
Metal + H₂O(l) Metal hydroxide + H₂(g)
3Fe(s) + 4H₂O(g) Fe₃O₄(s) + 4H₂(g)
Fe₃O₄is a mixture of FeO and Fe₂O₃.
Hence, Fe(OH)₂ is not formed.
Question 13
1 / -0

Elements that react violently on exposure to air are

A
Zn and P

B
Fe and P

C
P and Na

D
Al and S

Solution

Na is a reactive metal and reacts violently with O₂ and H₂O in the air to form H₂ gas, which immediately catches fire by acquiring its ignition temperature on gaining heat from the exothermic reaction. Therefore, Na is preserved under kerosene oil.
Phosphorus is a reactive non-metal and reacts violently with O₂ in the air. However, it does not react with water and is hence preserved under water.
Question 14
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Observe the following chemical equation and the related analogy.

H₂S + Cl₂ S + 2HCl

Substance reduced : Oxidising agent : : __ : Cl₂
The correct alternative that suits the analogy is:

A
HCI

B
H₂S

C
S

D
Cl₂

Solution

The substance reduced acts as the oxidising agent.
Question 15
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Which one of the following possesses covalent, ionic and coordinate bonds?

A
HCl

B
NH₄Cl

C
Cl₂

D
CH₄

Solution

NH₄Cl has all covalent, coordinate and ionic bonds.
NH₃has three covalent bonds. (N-H)
NH₄⁺ is formed by a coordinate bond. (H₃N:H⁺)
NH₄⁺Cl^- is formed by an ionic bond between the ammonium and the chloride ion.
Question 16
1 / -0

Silver gets tarnished in air by the formation of

A
Ag₂S

B
AgNO₃

C
Ag₃N

D
Ag₂O

Solution

Ag reacts with H₂S in the air to form silver sulphide.
Question 17
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Gunpowder contains a mixture of

A
charcoal, sulphur and potassium nitrate

B
sulphur, phosphorus and potassium chloride

C
charcoal and phosphorus

D
potassium nitrate and potassium sulphate

Solution

Gunpowder, one of the earliest known chemical explosives, is a mixture of charcoal, sulphur and potassium nitrate.
Question 18
1 / -0

Choose the correct option about the following statements.

A. Gallium sheets are used more than gallium wires.
B. Gallium exhibits ductility property but not the malleability.

A
Both A and B are true.

B
Both A and B are false.

C
A is true and B is false.

D
A is false and B is true.

Solution

Gallium is a metalloid, which is ductile and not malleable.
Question 19
1 / -0

Which of the following gases is produced during calcination?

A
CO₂

B
CO

C
SO₂

D
SO₃

Solution

Calcination is the heating of the carbonate ores in the absence of air to form the corresponding oxides.

CaCO₃(s) CaO(s) + CO₂(g)
Question 20
1 / -0

Which of the following ores cannot be reduced by carbon?

A
MnO₂

B
Fe₂O₃

C
ZnO

D
Cu₂O

Solution

Pyrolusite ore (MnO₂) cannot be reduced by carbon as Mn is a stronger reducing agent than carbon.
Carbon is a stronger reducing agent than Zn, Fe and Cu and can therefore reduce their oxides to obtain pure metal.
However, Cu₂O undergoes auto reduction and does not require any other reducing agent.

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Metals And Non-metals Test - 3

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Question 1

1 and 2

2 and 3

3 and 4

1 and 4

Solution

Question 2

Reaction of all alkali metals with water (at 25oC) is highly vigorous.

Reactions of all alkaline earth metals with water (at 25oC) is highly vigorous.

Nobel metals do not react with water.

Moderately reactive metals react only with steam.

Solution

Question 3

they are electropositive elements

the constituent atoms are held together by strong forces of attraction

the atomic number is high and hence, charge on the nucleus is high

the valence electrons are strongly bound to the nucleus

Solution

Question 4

CO2, SO2

N2O, H2O

P2O5, NO

SO3, N2O5

Solution

Question 5

(i) - (d), (ii) - (a), (iii) - (b), (iv) - (c)

(i) - (b), (ii) - (d), (iii) - (c), (iv) - (a)

(i) - (a), (ii) - (b), (iii) - (d), (iv) - (c)

(i) - (c), (ii) - (d), (iii) - (b), (iv) - (a)

Solution

Question 6

(i), (iv) and (v)

(i), (iii) and (v)

(i), (ii) and (iii)

(ii), (iv) and (v)

Solution

Question 7

Lead

Sodium

Lithium

Graphite

Solution

Question 8

(b) and (d)

(a) and (c)

(b) and (c)

(a) and (d)

Solution

Question 9

High ionisation energies

Bigger atomic radius

Greater number of valence electrons

Greater value of the effective nuclear charge

Solution

Question 10

the number of unpaired electrons is greater in chromium

the atomic radius of chromium is smaller

Both (1) and (2)

Neither (1) nor (2)

Solution

Question 11

HCI

HF

HBr

aqua regia

Solution

Question 12

H2

FeO

Fe2O3

Fe(OH)2

Solution

Reaction of all alkali metals with water (at 25^oC) is highly vigorous.

Reactions of all alkaline earth metals with water (at 25^oC) is highly vigorous.

CO₂, SO₂

N₂O, H₂O

P₂O₅, NO

SO₃, N₂O₅

H₂

Fe₂O₃

Fe(OH)₂

H₂S

Cl₂

NH₄Cl

Cl₂

CH₄

Ag₂S

AgNO₃

Ag₃N

Ag₂O

CO₂

SO₂

SO₃

MnO₂

Fe₂O₃

Cu₂O