Assertion : The `alpha`-hydrogen atom in carbonyl compounds is less acidic. Reason : The anion formed after the loss of `alpha`-hydrogen atom is resonance stabilised.

Hydrogen atom of chloroform is acidic. Explain".

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: The whole mass of the atom is concentrated in the nucleus. Reason: The mass of the nucleus can be either less or more than the sum of the masses of nucleus.

Assertion : Cu cannot liberate hydrogen from acids. Reason : Because it has positive electrode potential.

Assertion : Linkage isomerism arises in coordination compounds containing ambidentate ligand. Reason : Ambidentate ligand has two different don atoms.

Assertion: Aniline hydrogen sulphate, on heating forms a mixture of ortho and para aminosulphonic acids. Reason : The sulphonic acid group is electron withdrawing group.

Which of the following statement does not form part of Bohr's model of the hydrogen atom?

General instructions same as in chapter 1. Assertion:Large angle scattering of alpha particle led to the discovery of atomic nucleus. Reason:Entire positive charge of atom is concentrated in the central core.

Though hydrogen atom contains only one electron, yet its emission spectrum consists of many lines. Give reason.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : An atom behaves as a magnetic diple. Reson : It is beause, an atom contains equal positive and negative charges.