MEDIUM
RPF Constable CBT 1
IMPORTANT
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Beakers A, B and C contain zinc sulphate, silver nitrate and iron (II) sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour will appear in case of _____ .

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Important Questions on Chemistry

MEDIUM
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 180
A student puts one big iron nail each in four test tubes containing solutions of zinc sulphate, aluminium sulphate, copper
sulphate and iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was put in the solution of _____ .
EASY
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 181
Which of the following reactions not occur? 
EASY
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 182
Hydrogen gas is not widely used as a reducing agent because _____.
EASY
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 183
Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents? 
EASY
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 184
E is an element that's ore is rich in E2O3·E2O3 is not affected by water. It forms two chlorides, ECl2 and ECl3 .The element E is _____
HARD
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 185

Consider the following statements related to diamond and graphite.
I. Both diamond and graphite are used as abrasives.
II. Diamond and graphite have different arrangements of carbon atoms.
III. The carbon atoms in graphite have a different number of neutrons from those in a diamond.
IV. The carbon atoms in both graphite and diamond have four single covalent bonds.

The incorrect statement(s) is/are _____.

EASY
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 186
What would happen if graphene is heated in a sufficient supply of air? 
EASY
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 187

C4+ does not exist but Pb4+ exists although both belong to the same group. This is because _____ .

I. Size of carbon is much smaller than Pb.
II. Large amount of energy is needed in case of carbon.
III. Of inert pair effect.
IV nucleus cannot hold such a large number of electrons.
The correct statement (s) is/are: