5
MCQ (Single Correct Answer)
Which of the following statements about the electron is incorrect?
A
It is a negatively charged particle
B
The mass of electron is equal to the mass of neutron
C
It is a basic constituent of all atoms
D
It is a constituent of cathode rays
6
MCQ (Single Correct Answer)
Which of the following properties of atom could be explained correctly by Thomson model of atom?
A
Overall neutrality of atom
B
Spectra of hydrogen atom
C
Position of electrons, protons and neutrons in atom
D
Stability of atom
7
MCQ (Single Correct Answer)
Two atoms are said to be isobars if
A
they have same atomic number but different mass number
B
they have same number of electrons but different number of neutrons
C
they have same number of neutrons but different number of electrons
D
sum of the number of protons and neutrons is same but the number of protons is different
8
MCQ (Single Correct Answer)
The number of radial nodes for 3p orbital is ........... .
A
3
B
4
C
2
D
1
9
MCQ (Single Correct Answer)
Number of angular nodes for 4d orbital is ........... .
A
4
B
3
C
2
D
1