MHT-CET

2. Structure of atom question bank (Chemistry)

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Q1.

Uncertainty in the position of an electron (mass $= 9.1 \times 10^{-31} \ kg$) moving with a velocity $300 \ ms^{-1}$ accurate up to $0.001 \ \%$ will be $(h = 6.63 \times 10^{-34} \ J \cdot s)$.

(A)

$19.2 \times 10^{-2} \ m$

(B)

$5.76 \times 10^{-2} \ m$

(C)

$1.92 \times 10^{-2} \ m$

(D)

$3.84 \times 10^{-2} \ m$

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Q2.

Calculate the radius of the fourth orbit of the $B^{4+}$ ion. (in $pm$)

(A)

$169.3$

(B)

$211.6$

(C)

$380.8$

(D)

$413.2$

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