List of top Chemistry Questions

In preparation of alkene from alcohol using $ Al_2 O_3$, which is effective factor?

Which of the following compounds on boiling with $KMnO_4 $(alk.) and subsequent acidification will not give benzoic acid ?

Grignard reagent is not prepared in aqueous medium but it is prepared in ether medium because

How many moles of acidified $FeSO_4$ solution canbe completely oxidised by one mole of $KMnO_4$ ?

In the presence of cobalt chloride $(CoCl_2)$,bleaching powder decomposes to form....

Sodium hexametaphosphate is known as

Bond dissociation energies of HF, HCl,HBr follow the order..

The e.m.f. of a cell, whose half-cells are given below, is: $ M{{g}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Mg(s); $ $ E{}^\circ =-\,2.37\,\,V $ $ C{{u}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Cu(s); $ $ E{}^\circ =+\,0.34\,\,V $

What is the atomic number (Z) of the noble gasthat reacts with fluorine ?

An organic compound $A(C_4 H_9 C1)$ on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is

A compound of molecular formula $C_7H_{16}$ shows optical isomerism, compound will be

Which one of the following halogen liberates oxygen, when passed through hot concentrated KOH solution ?

Phenol is treated with bromine water and shaken well to get white precipitate. The white precipitate is

Vapour density of a metal chloride is 47.5. If the valency of metal is 2, the metal is:

For the reaction, $2N_{2}O_{5} \to 4NO_{2} + O_{2}$ rate and rate constant are $1.02 \times 10^{-4}\,mol\, L^{-1} s^{-1}$ and $3.4 \times 10^{-5} s^{-1}$ respectively. The concentration of $N_{2}O_{5}$ in mol $L^{-1}$ will be

Which of the following is correct about $H$-bonding in $DNA$?

Correct order of 1st ionisation potential (IP) among following elements Be, B, C, N, O is

Which one of the following gives positive Fehling's solution test?

Intermediates formed during reaction of RCNH2||O with Br2 and KOH are

The incorrect IUPAC name is

In steam distillation of toluene, the pressure of toluene in vapour is

The atomic number (Z) of an element is 25. In its ground state, how many electrons are present in the 'N' shell ?

Half life period of C14 is

Which of the following is not correctly matched

Which is not correct regarding the adsorption of a gas on surface of solid