HARD
7th CBSE
IMPORTANT
Earn 100
If the formula of a metal ion is , then the formula of its dihydrogen phosphate is
76.92% studentsanswered this correctly
Important Questions on Atomic Structure and Transformation of Matter
HARD
7th CBSE
IMPORTANT
Match the elements in column A with the valency exhibited by the element given in column B.
| Column A | Column B |
| (A) Neon (B) Oxygen (C) Potassium (D) Boron (E) Silicon |
(a) (b) (c) (d) (e) |
HARD
7th CBSE
IMPORTANT
Identify the number of neutrons present in a pair of elements with atomic numbers and , if their mass numbers are and , respectively.
HARD
7th CBSE
IMPORTANT
Tripositive ion, i.e., has protons and neutrons. Calculate the number of electrons present in the M shell of the neutral atom.
MEDIUM
7th CBSE
IMPORTANT
Which of the following is a chemical change?
HARD
7th CBSE
IMPORTANT
The atomic numbers of the elements X, Y and Z are , and , respectively. Identify the element which does not exist in monoatomic state.
EASY
7th CBSE
IMPORTANT
If a solid non-metal ‘’ forms an oxide of type , then the valency of is:
HARD
7th CBSE
IMPORTANT
The difference in the number of electrons between the K and L and L and M shells is the same for an atom of an element X (M shell is the valence shell.). And the difference of value is the number of valence electrons in the M shell of the other element Y. The electronic configurations of stable ions of X and Y are, respectively:
HARD
7th CBSE
IMPORTANT
The number of neutrons is equal to the number of protons present in the nucleus of two elements X and Y and their dinegative ions possess electrons in the L and M shells, respectively. Then the ratio of mass numbers of the two elements is:
