HARD
7th CBSE
IMPORTANT
Earn 100

Arrange the following points in a sequence for derivation of formulae of compounds.
- The valencies of the ions or radicals are written below the radicals without positive and negative sign.
- If the valencies have common factors, then they are divided by the highest common factor.
- The magnitude of valencies should be interchanged and written as subscripts on the right side of the respective ions.
- The positive radical followed by negative radical are written with their charges.
- If the radicals have more than one atom, they are enclosed in brackets and the appropriate valency (more than one) is written as subscripts outside the bracket.
(a)
(b)
(c)
(d)

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Important Questions on Atomic Structure and Transformation of Matter
HARD
7th CBSE
IMPORTANT
What will be the formula of the sulphate of a trivalent metal that is ?

HARD
7th CBSE
IMPORTANT
Match the element in column A with the electronic configuration given in column B.
Column A | Column B |
(A) Chlorine (B) Scandium (C) Manganese (D) Beryllium |
(a) (b) (c) (d) |

HARD
7th CBSE
IMPORTANT
The atomic numbers of three elements A, B and C are , and , respectively. Identify the element which is chemically reactive.

MEDIUM
7th CBSE
IMPORTANT
Heating solid ammonium chloride involves change in the _____.

HARD
7th CBSE
IMPORTANT
Arrange the following points in a sequence to draw the geometrical representation of .
- Protons and neutrons are shown in the nucleus.
- Writing the electronic configuration of the atom.
- Arrange the electrons in shells around the nucleus following the electronic configuration.
- Calculation of the number of protons and neutrons.
- Identification of the atomic number and mass number of the atom.

HARD
7th CBSE
IMPORTANT
Four types of reactions are given below in a particular order.
(p) Displacement reaction
(q) Combination reaction
(r) Double displacement
(s) Decomposition reaction
Follow this sequence to arrange the following reactions:
(a)
(b)
(c)
(d)

HARD
7th CBSE
IMPORTANT
Identify the coefficients of the products and formed respectively when hydrated copper nitrate is thermally decomposed.

HARD
7th CBSE
IMPORTANT
If the formula of a metal ion is , then the formula of its dihydrogen phosphate is
