Page 2 - 4. Home Assignmen - Ch-3 Mettalurgy-1

Subjective-

S.L Questions Ma Skill
No. rk
Q.1 1 R
Why sulphide and carbonate ores are converted into
oxides? [CBSE 2013]

Q.2 1 u
Define metallurgy.
[CBSE 2012]

Q.3 3 R+A
An ore on heating in air produces sulphur dioxide. Which process
would you suggest for its concentration? Describe briefly any two
steps involved in the conversion of the concentrated ore into the
related metal.
[CBSE2009]

Q.4 A metal (E) is stored under kerosene oil. When a small piece of it is left 3 U+A
open in air, it catches fire. When the product formed is dissolved in
water, it turns red litmus blue.
a. Name the metal (E).
b. Write the chemical equation for the reaction when it is exposed
to air and when the product is dissolved in water.
c. Explain the process by which metal is obtained from its molten
chloride. {CBSE 2012,2011]

Q.5 5 HOT
Give reason:

a. Carbonate and sulphide ores are usually converted into oxides
during the process of extraction of metals.
b. Ionic compounds generally have high melting point.
c. Hydrogen is not a metal but has been assigned a place in the
reactivity services of metals.
d. The galvanised iron article is protected against rusting even if the
zinc layer is broken. [CBSE
2015]

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