Metals and Non-metals Test

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Metals and Non-metals Test - 45

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Question 1
1 / -0

A student added dilute HCl to a test tube containing zinc granules. Which of the following observations are correct?
I. Zinc surface became dull and black.
II. A gas was evolved which burnt with a pop sound.
III. The solution remained colourless.

A
I and II

B
I and III

C
II and III

D
I, II and III

Solution

$$Zn + 2HCl \rightarrow ZnCl_2 + H_2$$
Due to the reaction of zinc with the acid, zinc loses its shiny appearance.
$$H_2$$ gas is evolved during the reaction. We can identify the gas with a burning match stick. A pop sound indicates its presence.
Zinc chloride formed in the reaction is colourless, so, the solution does not change its colour.
Hence, all the statements are correct.
Question 2
1 / -0

A metal gives lilac colour in bunsen flame and the solution of its oxide turns red litmus paper blue. The metal is?

A
$$Na$$

B
$$K$$

C
$$Ca$$

D
$$Li$$

Solution

Potassium metal ($$K$$) gives lilac (pink) colour in bunsen flame. Its oxide dissolves in water to form potassium hydroxide, which is an alkali. So, the solution of its oxide turns red litmus paper blue.

$$K_2O + H_2O \rightarrow 2KOH$$

Sodium metal ($$Na$$) gives yellow flame, calcium ($$Ca$$) gives orange red flame and lithium ($$Li$$) gives red flame.
Question 3
1 / -0

Observe the figure carefully and identify the substances marked as (p), (q) and (r).

A
(p) - Zinc, (q) - Water, (r) - Carbon dioxide

B
(p) - Magnesium, (q) - Hydrochloric acid, (r) - Oxygen

C
(p) - Magnesium, (q) - Water, (r) - Carbon dioxide

D
(p) - Zinc, (q) - Hydrochloric acid, (r) - Hydrogen
Question 4
1 / -0

Aluminium is not acted upon by pure water as

A
Impurities inwater are essential for the reacionn to occure

B
Itis light metal

C
It is protected by a film of alumininum oxide

D
It is not a reactive metal
Question 5
1 / -0

Choose the correct statement

A
Non-metals have higher ionisation enthalpies and higher electronegativity then the metals

B
non metals and metalloids exist only in the p-block of the periodic table.

C
change of non-metallic to metallic character can be illustrated by the nature of oxide they form

D
all are correct,

Solution
Question 6
1 / -0

Silver articles become black on prolonged exposure to air. This is due to the formation of

A
$$Ag_3N$$

B
$$Ag_2O$$

C
$$Ag_2S$$

D
$$Ag_2S$$ and $$Ag_3N$$

Solution

Hint: Silver articles become black on prolonged exposure to air due to the formation of sulphide.

Step 1: Corrosion.
Metals when exposed to air for a long period undergo corrosion. Corrosion is a common phenomenon for iron objects and corrosion of iron objects is called rusting.

Step 2: Corrosion in silver:
Unlike iron, silver when exposed to air for a long period undergo corrosion. Silver reacts with sulphur compounds present in the air to form silver sulphide. An example of such reaction is as follows:

$$Ag(s)+H_2S(g)\to Ag_2S(s)+H_2(g)$$

Step 3: Conclusion.
Corrosion or conversion of silver to silver sulphide on prolonged exposure to air turns silver to black colour.

Final step: So, the correct option is (C) $$Ag_2S.$$
Question 7
1 / -0

Which of the following metal evolves hydrogen on reacting with cold dilute $$HNO_{3}$$?

A
Mg

B
Al

C
Fe

D
Cu

Solution

Only magnesium and manganese react with nitric acid to release hydrogen gas. So, option A is correct.

Hydrogen gas is not evolved when other metals react with nitric acid because it is a strong oxidising agent. It oxidises hydrogen produced to water and itself gets reduced to a nitrogen oxide.
Question 8
1 / -0

A student was given few metals Mg, K, Fe and Cu. Which of them will react only with steam and not with cold or hot water to give $$H_{2}$$ gas?

A
Mg

B
K

C
Fe

D
Cu
Solution
- Iron (Fe) does not react with hot or cold water. It only reacts with steam to give hydrogen gas.
- Magnesium (Mg) does not react with cold water but reacts with hot water to give hydrogen gas.
- Potassium (K) reacts violently with cold water to give hydrogen gas.
- Copper (Cu) does not react with hot/cold water or steam.
Question 9
1 / -0

Argentite is a mineral of:

A
$$Au$$

B
$$Pt$$

C
$$Ag$$

D
$$Cu$$

Solution

Argentite is a silver sulfide mineral and is an important constituent of silver ore deposits. It contains around 87% silver.
Question 10
1 / -0

Sodium metal is extracted by the electrolysis of

A
$$NaCl(l)$$

B
$$NaCI(aq)$$

C
$$ Na_2SO_4(aq) $$

D
$$ NaNO_3(aq) $$

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Re-Attempt Weekly Quiz Competition

Metals and Non-metals Test - 45

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Metals and Non-metals Test - 45

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Question 1

I and II

I and III

II and III

I, II and III

Solution

Question 2

$$Na$$

$$K$$

$$Ca$$

$$Li$$

Solution

Question 3

(p) - Zinc, (q) - Water, (r) - Carbon dioxide

(p) - Magnesium, (q) - Hydrochloric acid, (r) - Oxygen

(p) - Magnesium, (q) - Water, (r) - Carbon dioxide

(p) - Zinc, (q) - Hydrochloric acid, (r) - Hydrogen

Question 4

Impurities inwater are essential for the reacionn to occure

Itis light metal

It is protected by a film of alumininum oxide

It is not a reactive metal

Question 5

Non-metals have higher ionisation enthalpies and higher electronegativity then the metals

non metals and metalloids exist only in the p-block of the periodic table.

change of non-metallic to metallic character can be illustrated by the nature of oxide they form

all are correct,

Solution

Question 6

$$Ag_3N$$

$$Ag_2O$$

$$Ag_2S$$

$$Ag_2S$$ and $$Ag_3N$$

Solution

Question 7

Mg

Al

Fe

Cu

Solution

Question 8

Mg

K

Fe

Cu

Solution

Question 9

$$Au$$

$$Pt$$

$$Ag$$

$$Cu$$

Solution

Question 10

$$NaCl(l)$$

$$NaCI(aq)$$

$$ Na_2SO_4(aq) $$

$$ NaNO_3(aq) $$

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