List of top Chemistry Questions asked in AIIMS

CH_2O

. Its molecular weight is

180

. The molecular formula of the compound is

Beilstein test is used for the detection of

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

Assertion (A) : Reaction of conc. $H_2SO_4$ on $NaBr$ and $NaI$ does not give $HBr$ and $HI$ .

Reason (R) : $HBr$ and $HI$ are oxidised by conc. HSO to Br and I.

In the light of the above statements, choose the correct answer from the options given below

Toluene can be oxidised to benzoic acid by

The specific conductivity of

N / 10 KCl

solution at

20^{\circ} C

is

0.0212 \,ohm ^{-1} cm ^{-1}

and the resistance of cell containing this solution at

20^{\circ} C

is

55 ohm

. The cell constant is

Xenon forms fluorides. Because 5d-orbitals are available for valence shell expansion.

Which oxide of nitrogen is obtained on heating ammonium nitrate at

250^{\circ} C

?

Which of the following exhibits the weakest intermolecular forces?

Which is the strongest acid in the following ?

Which among the following has the largest dipole moment?

The propene reacts with

HBr

to form

The meta-directing group in the following is

The correct order of the increasing ionic character is

Internal energy does not include

In the reaction: Phenol

{ ->[{NaOH}][{CHCl_3}] }

A

{ ->[{H^+}][{}] }

B, B

is identified as

If magnesium atom having atomic number

12

has an isotope with mass number

26

, then the number of protons, neutrons and electrons respectively of the atom are

If

300\,mL

of a gas at

27^{\circ} C

is cooled to

7^{\circ} C

at constant pressure, its final volume will be

CuSO_4

reacts with

KCN

solution and forms

Zinc displaces copper from copper sulphate solution. The

E^{\circ}_{298\, K}

of

Zn

is

-0.76 \,V

and that of

Cu

is

+0.34 \,V

.

Tailing of mercury occurs on passing ozone through it. Due to oxidation of mercury.

Lower aldehydes and ketones are soluble in water but the solubility decreases as the molecular masses increase. Distinction between aldehydes and ketones can be made by Tollens??test.

Pressure in a mixture of

4 \,g

of

O _{2}

and

2\, g

of

H _{2}

confined in a bulb of 1 litre at

0^{\circ} C

is

Which of the following are

{ }_{16} S ^{32}

and

{ }_{15} Pb ^{31}

?

Which of the following transition elements shows the highest oxidation state?