CBSE
X-rays are emitted during
, n reaction
K-capture
n, -reaction
- emission
Assertion : C- O bond in metal carbonyl is long.
Reason : There is delocalisation of electrons from filled d orbitals into the empty orbitals on the CO ligands.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false.
Radioactive isotope of hydrogen is :
Uranium
Deuterium
Tritium
None
Atomic number of an element is equal to the number of :
protons
neutrons
electrons
protons + neutrons
Assertion : The quantized energy of an electron is largely determined by its principal quantum number.
Reason : The principal quantum number n is a measure of the most probable distance of finding the electron around the nucleus.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The de Broglie wavelength associated with a ball of mass 1kg having kinetic energy 0.5 J is
6.626 10-34 m.
13.20 10-34 m.
10.38 10-21m.
6.626 10-34.
A radioactive nucleus will not emit :
alpha and beta rays simultaneously
beta and gamma rays simultaneously
gamma and alpha rays
gamma rays only
Electronk configuration of hydride ion is :
1so
1s1
1s2
1s12s1
Isotopic pair is :
20X40 , 21X40
20X40 , 20X41
40X20 , 41X20
None
72X180 zXA , Z and A are :
69 , 172
172 , 69
180 , 70
182 , 68