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Question-1
Non-metals react with hydrogen to form

(A) Ionic hydrides	(B) Covalent hydrides
(C) Metallic hydrides	(D) Hydroxides

Question-2
The Molten mixture contaning Cu₂S and FeS is called

(A) Slag	(B) flux
(C) matte	(D) gangue

Question-3
Who introduced the electrolytic method for the extraction of aluminium?

(A) Charles .M.Hall	(B) Wohler
(C) Bayer	(D) Pauling

Question-4
What metal is used to make electrical wires and cable for domestic or industrial usage?

(A) Sodium	(B) aluminium
(C) potassium	(D) gold

Question-5
Hydrogen reacts with oxygen to give

(A) Acidic oxide	(B) Basic oxide
(C) Neutral oxide	(D) Peroxide

Question-6
Which is the most important ore of iron?

(A) haematite(Fe₂O₃)	(B) Magnetite(Fe₃O₄)
(C) Limonite(Fe₂O₃.3H₂O)	(D) Siderite(FeCO₃)

Question-7
The naturally occurring compounds of metal mixed with earthly materials are called

(A) Ores	(B) Minerals
(C) Free metals	(D) Complexes

Question-8
Which metal is used for electrical heating element?

(A) Nichrome	(B) alnico
(C) bronze	(D) brass

Question-9
If the density of the gangue is less what method is used ?

(A) Gravity seperation method	(B) Magnetic separation method
(C) Froth flotation process	(D) Leaching process

Question-10
Which reacts with conc.nitric acid to give sulphuric acid?

(A) Sulphur	(B) Nitrogen
(C) Oxygen	(D) Phosphorous

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Std 8

ICSE/ISC

Practice in Related Chapters
Hydrogen
Structure of Atom
Transformation of Substances
Metals and nonmetals
Carbon and its Compounds