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CBSE

Chemistry

NEET Chemistry : Structure of Atom

111.

Atomic number of an element is equal to the number of :

112.

A radioactive nucleus will not emit :

113.

Radioactive isotope of hydrogen is :

114.

Electronk configuration of hydride ion is :

115.

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.

116.

Isotopic pair is :

117.

The de Broglie wavelength associated with a ball of mass 1kg having kinetic energy 0.5 J is

118.

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.

119.

X-rays are emitted during

120.

₇₂X¹⁸⁰ $\overset{2 α}{\to}$ $\overset{β}{\to}$ $\overset{γ}{\to}$ _zX^A , Z and A are :

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