An element X combines with hydrogen to form a compound XH₃ .The element X is placed on the right side of the periodic table. Which of the following statement is correct for element X?

I. Has two valence electrons.
II. Is a metal and is solid.
III. Is a non-metal and is a gas.
IV. Has five valence electrons.
V. XH₃ reacts with water to form a basic compound.

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Important Questions on Chemistry

MEDIUM

RPF Constable CBT 1

IMPORTANT

Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 197

Listed below are the locations of certain elements in groups and periods of the periodic table. Arrange these elements in the expected order of increasing non-metallic character:
I. Element in the fourth period and group IV A
II. Element in the third period and group VI A
III. Element in the fourth period and group VI A
IV. Element in the six period and group III A
V. Element in the second period and group VII A
The correct order is:

EASY

RPF Constable CBT 1

IMPORTANT

Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 198

An element X belongs to group 2 and period 3 of the periodic table. The chemical formulae of its nitrate, sulphate and phosphate respectively will be _____ .

EASY

RPF Constable CBT 1

IMPORTANT

Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 199

An element belongs to group 17. It is present in third period and its atomic number is 17. What is the atomic number of the element belonging to same group and present in fifth period?

EASY

RPF Constable CBT 1

IMPORTANT

Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 200

Consider the following figure:

p

Ru

Os

q

Rh

Ir

r