JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Easy

1 of 1

Analyzing +4 | -1

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Loss of electron from hydrogen atom results in nucleus of

\sim 1.5 \times 10^{-3} \, \mathrm{pm}

size.

Reason R: Proton

\left(\mathrm{H}^{+}\right)

always exists in combined form.

In the light of the above statements, choose the most appropriate answer from the options given below:

View answer and explanation

Correct option: D

Both A and R are correct but R is NOT the
correct explanation of A

The correct answer is D because both the assertion and the reason are correct, but the reason is not the correct explanation of the assertion. The size of the nucleus is indeed around

1.5 \times 10^{-3} \, \mathrm{pm}

, and protons always exist in combined form, but these two facts are unrelated.

More Questions from STRUCTURE OF ATOM

Practice All Chapter MCQs →

Which of the following is paramagnetic? The time taken by the electron in one complete revolution in the

n^{\text {th }}

Bohr's orbit of the hydrogen atom is The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency '

\mathrm{A}

\times 10^{12}

hertz and that has a radiant intensity in that direction of

\frac{1}{{ }^{\prime} \mathrm{B}^{\prime}}

watt per steradian. 'A' and 'B' are respectively Quantum number which defines the orientation of orbital present in a subshell is Maximum number of electrons associated with

\ell = 1,\,\,m = 0

in magnesium atom is The nucleus and an atom can be assumed to be spherical. The radius of the nucleus of mass no. A is given by

1.25 \times {10^{ - 13}} \times {A^{1/3}}\mathrm{cm}.

. The atomic radius of atom is 1 Å. If the mass no. is 64, the fraction of the atomic volume that is occupied by nucleus is: