CBSE
Multiple Choice QuestionsIndia conducted an underground nuclear test at
Narora
Tarapur
Pushkar
Pokharan
Consider the following pairs of ions:
I. Sc3+ and Ti4+ II. Mn2+ and Fe2+
III. Fe2+ and Co3+ IV. Cu+ and Zn2+
Among these pairs ofions, isoelectronic pairs would include:
II, III and IV
I, III and IV
I, II and IV
I, II and III
Which is the shortest wavelength line in the Lyman series of the hydrogen spectrum? (R= 1.097 x 10-2 nm-1)
94.21 nm
91.16 nm
911.6 nm
933.6 nm
The line spectrum of He+ ion will resemble that of :
hydrogen atom
Li+ ion
helium atom
lithium atom
A golf-ball weigh 40.0 gm. If it is moving with a velocity of 20.0 ms-1, it's de-Broglie wavelength is
1.66 x 10-34 nm
8.28 x 10-32 nm
8.28 x 10-25 nm
1.66 x 10-24 nm
A body of mass x kg is moving with a velocity of 100 ms-1. Its de-Broglie wavelength is 6.62 x 10-35 m. Hence, x is :
[h = 6.62 x 10-34Js]
0.1 Kg
0.25 Kg
0.15 Kg
0.2 Kg
Which of the following order of ionisation energy is correct?
B < Be < N < C
Be > B > C > N
B < Be < C < N
Be < B < C < N
Dual nature of particle was-given by
Bohr theory
Thomson model
Heisenberg principle
de-Broglie equation
An element 'Y' emits one -and two - particles to give 'X'. X and Y are
isotones
isobars
isotopes
isoelectronics
Ratio of radii of second and first Bohr orbits of H atom is
2
4
3
5
