Metallurgy Exe-7(A) Concise Class-10 ICSE Chemistry Selina Solutions Chapter-7. We Provide Step by Step Answer of Exe-7(A) Questions of Exercise-7 for ICSE Class-10. The given Solutions are according to the Latest editions. Visit the official Website CISCE for detail information about ICSE Board Class-10.

Metallurgy Exe-7(A) Concise Class-10 ICSE Chemistry Selina Solutions Chapter-7

Board	ICSE
Book / Publication	Concise / Selina
Subject	Chemistry
Class	10th
Writer	Dr SP Singh
Chapter-7	Metallurgy
Topics	Exe-7(A)
Edition	2025-2026

Exe-7(A) Questions on Metallurgy

Page-126

Que-1: 

(a) Name the three classes in which elements are classified. Which was the first metal used by man?
(b) Name the metal and non-metal present in abundance in the earth crust.

Ans:
(a) Three classes in which elements are classified are:
Metals,     Non-metals  and  Metalloids

Que-2: Name the metal which is a constituent of: (a) Blood pigment (b) Plant pigment

Ans:
(a) The metal which is a constituent of blood pigment is Iron (Fe)
(b) The metal which is a constituent of plant pigment is Magnesium (Mg).

Que-3: Give the importance of the following in living beings:
(a) Nitrogen, (b) Hydrogen, (c) Carbon

Ans:
(a) Nitrogen: It is used to preserve food.
(b) Hydrogen: It is used in the hydrogenation of vegetable oils to make ghee.
(c) Carbon: It is essential for the growth and development of living beings.

Que-4: State the position of the following in the periodic table:

(a) Alkali metals (b) Alkaline earth metal (c) Halogens (d) Aluminium

Ans:
(a) Alkali metals: They are placed in IA group, the first column on the left of the periodic table.
(b) Alkaline earth metal: They are placed in IIA group, the second column on the left of the periodic table
(c) VIIA
(d) Aluminium: It is placed in IIIA group present on the right of periodic table.

Que-5: Name: 

(a) a liquid non-metal
(b) Name two metalloids.
(c) metal which do not corrode easily
(d) Two metals which react with cold water.
(e) a non-metal which can form a positive ion,
(f) A non-metal which shows reducing property.

Ans:
(a)  a liquid non-metal Bromine
(b) Metalloids: Boron (B), Silicon (Si)
(c) Aluminium
(d) Potassium, sodium
(e) Hydrogen
(f) Carbon

Que-6: From the list of characteristics given below, select the five which are relevant to non-metals and their compounds:

A. Ductile.
B. Conductors of electricity
C. Brittle
D. Acidic Oxide
E. Basic Oxide
F. Discharge at Anode
G. Discharge at Cathode
H. Ionic Chloride
I. Covalent Chloride
J. Reaction with Dil H2so4 Gives H Gas
K. 1,2 or 3 valence electron
L.  5,6,,7 valence electron
From the list of characteristics given below, select the five which are relevant to non-metals and their compounds:

Ans:
D. Acidic oxides
C. Brittle
F. Discharged at anode
I. Covalent chlorides
L. 5,6,7 valence electrons

Que-7: 

(a) Why are alkali metals kept in kerosene oil?
(b) Why is hydrogen kept in the metal activity series?
(c) Why gold ornament look new after several year of use

Ans:
(a) Alkali metals like sodium and potassium are kept in kerosene as they react with moisture and air.
(b) Hydrogen, a non-metal, has been included in the metal activity series because it can form a positive ion. It would occupy the position based on its formation of the positive ion.
(c) Gold occupies the lowest position in the metal activity series. This means it will not react with other molecules easily. Gold is a noble element and will not form new compounds easily. Hence gold ornaments look new even after several years of use.

Que-8: From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which

a. does not react with dilute hydrochloric acid
b. can form 2+ and 3+ ions
c. Arrange the above metals in the decreasing order of reactivity.

Ans:
a. does not react with dilute hydrochloric acid: Copper
b. can form 2+ and 3+ ions: Iron (Fe)
c. Metals in the decreasing order of reactivity:
Na > Mg > Zn > Fe > Cu

Que-9: Which metal occurs as:

(a) A sulphide
(b) A halide
(c) A carbonate
(d) An oxide
Also give the names of their respective ores.

Ans:
(a) a sulphide — Zn; Ore — Zinc Blende [ZnS]
(b) a halide — Sodium; Ore — Rock salt [NaCl]
(c) a carbonate — Calcium; Ore — Limestone [CaCO3]
(d) an oxide — Aluminium; Ore — Bauxite [Al2O3.2H2O]

Que-10: Distinguish between:

(a) A mineral and an ore
(b) An ore and a metallic compound

Ans:
(a) Minerals are naturally occurring compounds of metals which are generally present with other matter such as soil, sand, limestone and rocks. Ores are those minerals from which the metals are extracted commercially at low cost and comfortably. All ores are minerals, but all minerals are not necessarily ores.
(b) Ores are those minerals from which the metals are extracted commercially at low cost and with minimum effort. A metallic compound is a compound that contains one or more metal elements. Examples: AgNO3 – Silver nitrate is a metallic compound.

Que-11: Which metal can be extracted from each one of the following ores:

(a) Bauxite
(b) Calamine
(c) Haematite

Ans:
The metals that can be extracted from the following ores are:
(a) Bauxite- Aluminium
(b) Calamine- Zinc
(c) Haematite- Iron

Que-12: Explain the following terms:

(a) Ore
(b) Gangue

Ans:
(a) Ore: Minerals from which, the metals may be exerted economically in reasonably pure condition.
(b) Gangue: Earthly impurities including silica, mud etc., associated with the ore are called gangue.

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