How many electrons in Cu atom have (n + ) = 4
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Chemistry MCQs for NEET — Practice Questions with Answers
Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
For a certain particle, it is found that uncertainty 1840 in velocity is reciprocal of uncertainty in position This implies that
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Suggest two transitions in hydrogen spectrum for which wave number ratio is 108:7
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
The wave number ratio of 108:7 corresponds to the transitions 2 → 1 and 4 → 3 in the hydrogen spectrum. This can be calculated using the Rydberg formula, which relates the wavenumber to the energy levels involved in the transition.
The ratio of K.E. to P.E. of an electron in Bohr orbit of H like species is
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
$ K.E = { Ze ^ 2 \over 2 r } P.E = { Ze ^2 \over r } \therefore {K.E \over P.E} = { 1/2 \over -1 } = -1.2 $
For particles having same KE., the de-broglie wavelength is
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
In one joule of energy, the number of photon with wave number equal to is
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
$ E = h \nu = nh { c \over \lambda } = nhc \bar v \therefore now E = 1 , \bar v = x \therefore n = { 1 \over hcx } = ( hcx)^{-1} $
Which of the expression given below gives IE of H atoms in terms of Rydberg’s constant $ (R_H)$ ?
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
The expression $R_H hc$ gives the ionization energy (IE) of the hydrogen atom in terms of the Rydberg constant ($R_H$), Planck's constant ($h$), and the speed of light ($c$). This expression is derived from the Rydberg formula and represents the energy required to remove an electron from the ground state of the hydrogen atom.
One unpaired electron causes magnetic moment of 1.1 B.M. The magnetic moment of $ Fe^{+2} $ ion is
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
If numerical value of mass and velocity are equal then de-Broglie wave length in terms of K.E. is
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
If uncertainty in position and velocity are equal then uncertainty in momentum will be
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Ready to ace NEET?
Free access · No credit card required
Frequently Asked Questions
Yes. You can attempt every Chemistry question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.