Metals And Non-metals Test

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Metals And Non-metals Test - 1

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Weekly Quiz Competition

Question 1
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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
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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
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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
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'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

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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
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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
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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.

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Metals And Non-metals Test - 1

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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

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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