EASY
UPSC CAPF AC Paper - I
IMPORTANT
Earn 100

Which of the following statements are correct?

1. Isotopes are atoms with the same atomic number but different atomic mass.

2. Isobars are atoms with the same number of neutrons but different atomic number.

3. Isotones are atoms with the same mass number but different atomic number.

Select the correct answer using the codes given below.

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Important Questions on Chemistry

EASY
UPSC CAPF AC Paper - I
IMPORTANT

Two atoms are said to be isotopes if _____.

HARD
UPSC CAPF AC Paper - I
IMPORTANT

Match the rule given in List I with the statement given in List II.
List I                                                List II

A. Pauli's exclusion principle         1. In orbitals of equivalent energy electron spins remain unpaired if possible

B. Hund's rule                                 2. Transition from the higher shell to K-shell

C. Lyman series                              3. The effect of magnetic field on the atomic spectra

D. Zeeman effect                            4. No two electrons can have the same four quantum numbers

MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT
Wavelengths of which of the following colour of the visible spectrum of light are maximally absorbed by green plants?
HARD
UPSC CAPF AC Paper - I
IMPORTANT
In an atomic nucleus, neutrons and protons are held together by
EASY
UPSC CAPF AC Paper - I
IMPORTANT

Which of the following statements with regard to isotopes and isobars is/are correct?
1. Isotopes have the same mass number.
2. Isobars have the same atomic number.

Select the correct answer using the codes given below.

HARD
UPSC CAPF AC Paper - I
IMPORTANT
The ratio of specific charge of a proton and an a-particle is?
EASY
UPSC CAPF AC Paper - I
IMPORTANT
Which of the following reaction led to the discovery of neutrons?
HARD
UPSC CAPF AC Paper - I
IMPORTANT
Which of the following assumes integral values in Bohr's atomic model?