Materials Metals And Non-Metals Test

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Materials Metals And Non-Metals Test - 1

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Weekly Quiz Competition

Question 1

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Match the metals in the first column with their applications in the second column and the properties exploited in the third column:

Metal	Application	Properties exploited
A. Gold (Au)	I. Making aircraft	(i) Lustre, low reactivity
B. Aluminium (Al)	II. Jewellery	(ii) Conductivity
C. Iron (Fe)	III. Electric circuits	(iii) Low density
D. Copper (Cu)	IV. Making automobiles	(iv) High tensile strength

Choose the correct match from the following:

(1)	A, II, (iv)	B, I, (i)	C, IV, (ii)	D, III, (iii)
(2)	A, II, (i)	B, I, (iii)	C, IV, (iv)	D, III, (ii)
(3)	A, III, (i)	B, II, (ii)	C, I, (iii)	D, IV, (iv)
(4)	A, IV, (i)	B, III, (iv)	C, II, (ii)	D, I, (iii)

(1)

(2)

(3)

(4)

Solution

The correct match is:

(2)

A, II, (i)

B, I, (iii)

C, IV, (iv)

D, III, (ii)

Question 2

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Arrange metals A, B and C according to their order of reactivity.

Metal	Salt solution of A	Salt solution of B	Salt solution of C
A		No reaction	No reaction
B	Displacement reaction		Displacement reaction
C	Displacement reaction	No reaction

A > B > C

A < C < B

A < B < C

B < A < C

Solution

Since metal B can displace both metals A and C from their respective solutions, it is the most reactive.
Also, the metal A cannot displace metals B or C from their solutions, hence, it is the least reactive.

The increasing order of reactivity of the given metals is:
A < C < B

Question 3
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Which of the following reactions cannot occur?

I. Cu(s) + 2HCl(aq) → CuCl₂(aq) + H₂
II. 2Al(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H₂
III. Pb(s) + H₂SO₄(aq) → PbSO₄(aq) + H₂(g)
IV. Cu(s) + MgSO₄(aq) → CuSO₄(aq) + Mg(s)

A
Only I and III

B
Only I and II

C
Only I and IV

D
Only II and IV

Solution

The reactions I and IV cannot occur because Cu is less reactive than hydrogen as well as magnesium. Hence, it cannot displace these elements from the solutions of their compounds.
Question 4
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The most reactive metal and non-metal, respectively, are

A
Li and Cl

B
F and Br

C
Cs and F

D
Fe and I

Solution

Alkali metals that lie on the extreme left of the periodic table and halogens that lie on the extreme right of the periodic table are the most reactive elements in the entire periodic table. As we go down the group of alkali metals, the reactivity increases and hence, Cs is the most reactive metal.

On moving down the group of halogens, the reactivity decreases and hence, F is the most reactive halogen.

Therefore, Cs (among metals) and F (among non-metals) are the most reactive elements in the entire periodic table.
Question 5
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Which two of the following metals react violently with cold water?

A
Potassium and sodium

B
Potassium and aluminium

C
Sodium and copper

D
Magnesium and sodium

Solution

Potassium and sodium are highly electropositive metals and react vigorously even with cold water to form hydrogen gas. The reaction is highly exothermic and the hydrogen evolved acquires its ignition temperature and catches fire causing a small explosion.
Question 6
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Which of the following metals do not react with H₂SO₄?

A
Au and Pt

B
Fe and Ni

C
Co and Cr

D
Cr and Mn

Solution

Au and Pt are both noble metals because of their low reactivity.
They do not react with acids unlike other metals.
However, Au and Pt dissolve in aqua regia, which is 3 parts of conc. HCl and 1 part of conc. HNO₃.
Question 7
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The most abundant element in the Earth's crust is

A
oxygen

B
silicon

C
aluminium

D
iron

Solution

Oxygen is the most abundant element in the Earth's crust and occurs in the form of mineral oxides or carbonates.

The four most abundant elements in the order of abundance in the Earth's crust are:

Oxygen > Silicon > Aluminium > Iron

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Re-Attempt Weekly Quiz Competition

Materials Metals And Non-Metals Test - 1

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Materials Metals And Non-Metals Test - 1

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Question 1

(1)

(2)

(3)

(4)

Solution

Question 2

A > B > C

A < C < B

A < B < C

B < A < C

Solution

Question 3

Only I and III

Only I and II

Only I and IV

Only II and IV

Solution

Question 4

Li and Cl

F and Br

Cs and F

Fe and I

Solution

Question 5

Potassium and sodium

Potassium and aluminium

Sodium and copper

Magnesium and sodium

Solution

Question 6

Au and Pt

Fe and Ni

Co and Cr

Cr and Mn

Solution

Question 7

oxygen

silicon

aluminium

iron

Solution

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