Atoms, Molecules and Radicals - ICSE STD 7 CHEMISTRY Questions - Vidyadip

Question types

Atoms, Molecules and Radicals question types

122 questions across 6 question groups — pick any mix to generate a CHEMISTRY paper with step-by-step answer keys.

122

Questions

6

Question groups

5

Question types

MCQ

[1 Mark Question Answer]

[2 Mark Question Answer]

[3 Mark Question Answer]

[5 Mark Question Answer]

Fill in the blanks.

Sample Questions

Atoms, Molecules and Radicals questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark

Which of the following exhibit variable valency ?

A
calcium
✓
copper
C
carbon
D
chlorine

Answer: B.

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Q 2MCQ1 Mark

The sulphate radical is written as $SO _4{ }^{2-}$. What is the formula of calcium sulphate ?

A
$Ca \left( SO _4\right)_2$
B
$Ca \left( SO _4\right)_2$
C
$Ca \left( SO _4\right)_3$
✓
$CaSO _4$

Answer: D.

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Q 3MCQ1 Mark

Which of the following has valency $4$ ?

A
aluminium
B
oxygen
✓
carbon
D
phosphorus

Answer: C.

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Q 4MCQ1 Mark

The valency of iron in $Fe$ is

A
$1$
B
$2$
✓
$3$
D
$4$

Answer: C.

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Q 5[1 Mark Question Answer]1 Mark

Write the molecular formulae of Magnesium nitride:

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Q 6[1 Mark Question Answer]1 Mark

Write the molecular formulae of Aluminium sulphate :

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Q 7[1 Mark Question Answer]1 Mark

Write the molecular formulae of Calcium phosphate :

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Q 8[1 Mark Question Answer]1 Mark

Write the molecular formulae of Nitric acide :

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Q 9[1 Mark Question Answer]1 Mark

Write the molecular formulae of Iron (III) sulphide:

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Q 10[2 Mark Question Answer]2 Marks

Name the following radicals and give their valencies:
1. $SO _4$
2.$CO _3$
3.$OH _4$
4.$Cr _2 O _7$

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Q 11[2 Mark Question Answer]2 Marks

Diagrammatically represent the transfer of electrons.

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Q 12[2 Mark Question Answer]2 Marks

State Dalton’s atomic theory.

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Q 13[3 Mark Question Answer]3 Marks

What do you understand by the following terms valency, valence electrons and valence shell?

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Q 14[3 Mark Question Answer]3 Marks

Give the charge and the mass of an electron, proton and neutron present in an atom ?

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Q 15[5 Mark Question Answer]5 Marks

An element belongs to group II. What would be its valency? Write the formula of molcules of compounds it will form with elements in VA, VIA and VIIA groups.

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Q 16[5 Mark Question Answer]4 Marks

Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.

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Q 17[5 Mark Question Answer]4 Marks

Write the symbols and valencies of the following radicals:
(a)Magnesium iron
(b) Amonium
(c)carbonate
(d)Nitrate
(e)Oxied
(f) Bisulphate
(g) Aluminium ion

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Q 18Fill in the blanks.1 Mark

The tabular arrangement of elements in horizontal rows and vertical columns _________

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Q 19Fill in the blanks.1 Mark

The combining capacity of an element _______

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Q 20Fill in the blanks.1 Mark

A group of atoms that react as a single unit ______

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Q 21Fill in the blanks.1 Mark

The symbolic representation of a molecule ______

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Q 22Fill in the blanks.1 Mark

The number of atoms present in a molecule of an element _________

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