AIIMS Chemistry Questions

If energy of electron in ground state is −13.6 then find out speed of electron in fourth orbit of H⁻atom

If energy of 15 eV is given to electron in $4^{th}$ orbit then find it's final energy when it comes out of H⁻atom.

An electron is revolving in n = 3 orbit. What will be the magnetic field at the centre of hydrogen atom?

An electron collides elastically with H⁻like atom and excites it from ground state to n = 3. Find out the energy transfer to H⁻like atom

At which excited state of $\text{Be}^{3+}$ radius of $\text{e}^-$ will be same as $\text{H}$ atoms and electron in ground state.

Assertion: For revolving electron, direction of angular momentum and magnetic moment are opposite.

Reason: Charge of electron is negative.

Energy of electron (in eV) in $2^{\text{nd}}$ orbit of $\text{He}^+$ ion?

Assertion: For an element generally N ≥ Z (N=number of neutrons, Z= atomic number) Reason: Neutrons always experience attractive nuclear force.

Assertion: Hydrogen atom consists of only one electron but its emission spectrum has many lines. Reason: Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.

Assertion : Hydrogen atom consists of only one electron but its emission spectrum has many lines.

Reason : Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.

The complete reaction is shown below.

IUPAC name of

The complete reaction is shown below.

Correct order of electrophilic substitution reaction is:

$\text{A} \xrightarrow{\text{Ph}-\text{SO}_2\text{Cl}} \text{B} \xrightarrow{\text{KOH}} \text{C} \xrightarrow{\text{C}_2\text{H}_5\text{I}} \text{D}$'C' is water solubleCorrect structure of A and D are

Match following coloumn:

Correct order of SN2 reaction is:

Stability order of following carbocation is :

Assertion: $\text{CH}_3 - \underset{\substack{| \\ \text{CH}_3}}{\overset{\substack{\text{CH}_3 \\ |}}{\text{C}}} - \text{O} - \text{CH}_3$ React with HBr to form $(\text{CH}_3)_3\text{CBr}$ and $\text{CH}_3\text{OH}$

Reason: It follows SN1 mechanism

Find the end product of reaction

$\text{Ph}-\text{CH}_2-\text{CH}=\text{CH}-\text{CH}_3 \xrightarrow[\text{(ii) Alk. KOH}]{\text{(i) Br}_2}$

Assertion: Phenol is more acidic then m-methoxy phenol Reason: $\text{–OCH}_3$ shows +I effect

Product is:

Compare stability of free radicals

(I) $\text{CH}_3-\dot{\text{C}}\text{H}-\text{CH}_3$

(II) $\text{C}_6\text{H}_5-\dot{\text{C}}\text{H}_2$

(III)$\dot{\text{C}}\text{H}_2-\text{CH}(\text{CH}_3)_2 \qquad \text{(IV) }\dot{\text{C}}\text{H}_2-\text{CH}_3$

$\text{Phenol} + \text{Aniline} \xrightarrow{\text{C}_6\text{H}_5\text{N}_2^+\text{Cl}^- / \text{KOH}} \text{Major Product: Product will be :}$

Assertion : Glyceraldehyde reacts with 2 2 Br /H Oto form achiral compound

Reason: –CHO and $\text{–CH}_{2}\text{OH}$ both are oxidized

Correct order for reaction with alcoholic KOH

Write IUPAC name of following compound

$-\text{NH}-\text{C}(=\text{O})-\text{NH}-\text{NH}_2\text{ group}\rangle \xrightarrow{\text{(i)HCl} / \text{(ii)}\Delta} \text{Major product of following reaction}$

Assertion: Propene reacts with HI in presence of peroxide give¹⁻iodopropane. Reason: 1° free radical is less stable than 2° free radical

Identify structure of ‘P’ and ‘Q’ Correct order of pKa value is:

$\langle\text{1-chloro-2-methoxybenzene structure}\rangle \xrightarrow{\text{HNO}_3 / \text{H}_2\text{SO}_4} \text{Major Product, product will be :}$

Correct order of basic strength is:

$\text{H}-\overset{\substack{\text{O} \\ ||}}{\text{C}}-\text{H} + \text{CH}_3-\text{CH}=\text{O} \xrightarrow{\text{Conc. NaOH}}$ Find out the products of reaction

Which of the following statement is correct for oleum ?

(i) $\text{F}_3\text{C}-\text{COOH}$ , (ii) $\text{CH}_3\text{COOH}$ , (iii) $\text{C}_6\text{H}_5\text{COOH}$ ,(iv) $\text{CH}_3\text{CH}_2\text{COOH}$

Correct order of $\text{pK}_\text{a}$ value is:

IUPAC name of give compound:

Which is incorrect for paper chromatograph

How many spectral line of Balmer series present in visible region :

Order of acidic nature

Assertion: Anhydrides are more reactive than ester for nucleophilic substitution.

Reason:– $\text{R.COO}^{-}$ is better leaving group than $\text{R-O}^{-}$

Suitable reagent for following conversion

For a first order gas phase reaction :

$\text{A}_{(\text{g})} \rightarrow 2\text{B}_{(\text{g})} + \text{C}_{(\text{g})}$

$\text{P}_0$ be initial pressure of A and $\text{P}_t$ the total pressure at time ‘t’. Integrated rate equation is :

The complete reaction is shown below.

Assertion: m-Bromotoluene can be prepared by m-toluidene.

Reason: Amino group is meta directing

Assertion: Two sugar units joined by 1,2-glycosidic bond in sucralose.

Reason: It contains 1 C-glucose and 2 C -fructose glycosidic bond

Assertion: Hydroquinone is more acidic than resorcinol.

Reason: OH shows I− effect

The complete reaction is shown below.

The complete reaction is shown below.

Out of $\text{BeF}_2, \text{MgF}_2, \text{CaF}_2, \text{SrF}_2$ which has maximum solubility :