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CBSE

Subject

Chemistry

NEET Chemistry : Structure of Atom

Multiple Choice Questions

161.

A radioactive atom ${}_{Y}^{X}M$ emits two $α$ particles and one $β$ particle successively. The number of neutrons in the nucleus of the product will be:

X - 4 - Y
X - Y - 5
X - Y - 3
X - Y - 6

162.

$The number of α and β particles emitted in nuclear reaction {}_{90}{Th}^{228} \to {}_{83}{Bi}^{212}$ are respectively

163.

If a species has 16 protons, 18 electrons and 16 neutrons, find the species and its charge.

S^1-
Si^2-
P^3-
S^2-

164.

Which of the following expressions gives the de-Broglie relationship?

$p = \frac{h}{mv}$
$λ = \frac{h}{mv}$
$λ = \frac{h}{mp}$
$λm = \frac{v}{p}$

165.

1 mole of photon, each of frequency 2500 s^-1, would have approximately a total energy of

10 erg
1 J
1 eV
1 MeV

166.

The number of electron and neturons of an element is 18 and 20 respectively. Its mass number is

167.

The orbital angular momentum of an electron in 2s orbital is

$+ \frac{1}{2} \frac{h}{2 π}$
zero
$\frac{h}{2 π}$
$\sqrt{2} \frac{h}{2 π}$

168.

The radius of hydrogen atom is 0.53 Å. The radius of ₃Li²⁺ is of:

1.27 Å
0.17 Å
0.57 Å
0.99 Å

169.

In Sommerfeld's modification of Bohr's theory, the trajectory of an electron in a hydrogen atom is

a perfect ellipse
a closed ellipse-like curve, narrower at the perihelion position and flatter at the aphelion position
a closed loop on spherical surface
a rosette

170.

For the Paschen series the values of n₁ and n₂in the expression $∆ E = Rhc (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}}) are$

n₁= 1, n₂ = 2, 3, 4, ...
n₁= 2, n₂ = 3, 4, 5,...
n₁= 3, n₂= 4,5,6,...
n₁= 4, n₂ = 5,6,7,...

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