List of top Chemistry Questions asked in JEE Main

Which of the following is a bactericidal antibiotic ?

Consider the reaction sequence below :

X is :

The transition metal ions responsible for color in ruby and emerald are, respectively :

Which one of the following reagents is not suitable for the elimination reaction ?

Identify the correct statement :

Identify the incorrect statement :

Sodium extract is heated with concentrated \(\mathrm{HNO_3}\) before testing for halogens because :

If 100 mole of \(\mathrm{H_2O_2}\) decompose at 1 bar and 300 K, the work done (kJ) by one mole of \(\mathrm{O_2(g)}\) as it expands against 1 bar pressure is :
\(2\mathrm{H_2O_2(l)} \rightleftharpoons 2\mathrm{H_2O(l)} + \mathrm{O_2(g)}\)
(\(R = 8.3\ \mathrm{J\,K^{-1}\,mol^{-1}}\))

Assertion : Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity.
Reason : Hybridization of carbon in diamond and graphite are \(sp^3\) and \(sp^2\), respectively.

The rate law for the reaction below is given by the expression \(k\,[A][B]\)
\(A + B \rightarrow \text{Product}\)
If the concentration of B is increased from 0.1 to 0.3 mole, keeping the value of A at 0.1 mole, the rate constant will be :

Aqueous solution of which salt will not contain ions with the electronic configuration \(1s^2 2s^2 2p^6 3s^2 3p^6\) ?

The bond angle H-X-H is the greatest in the compound :

Initially, the root mean square (rms) velocity of \(\mathrm{N_2}\) molecules at certain temperature is \(u\). If this temperature is doubled and all the nitrogen molecules dissociate into nitrogen atoms, then the new rms velocity will be :

The test to distinguish primary, secondary and tertiary amines is :

The most appropriate method of making egg-albumin sol is :

Identify the correct trend given below :
(Atomic No. = Ti : 22, Cr : 24 and Mo : 42)

BOD stands for :

The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is :

5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is :

The gas evolved on heating \(\mathrm{CH_3MgBr}\) in methanol is :

Which one of the following complexes will consume more equivalents of aqueous solution of \(\mathrm{Ag(NO_3)}\) ?

Which one of the following species is stable in aqueous solution ?

Match the items in Column I with its main use listed in Column II :

Column I	Column II
(A) Silica gel	(i) Transistor
(B) Silicon	(ii) Ion-exchanger
(C) Silicone	(iii) Drying agent
(D) Silicate	(iv) Sealant

The plot shows the variation of \(-\ln K_p\) versus temperature for the two reactions \(\mathrm{M(s)}+\frac{1}{2}\mathrm{O_2(g)}\rightarrow\mathrm{MO(s)}\) and \(\mathrm{C(s)}+\frac{1}{2}\mathrm{O_2(g)}\rightarrow\mathrm{CO(s)}\).

Identify the correct statement :

The correct order of the solubility of alkaline-earth metal sulphates in water is :