List of top Chemistry Questions

The correct order of increasing thermal stability of $K_2CO_3, MgCO_3, CaCO_3 $ and $ BeCO_3$ is

Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?

5 g of $CaCO_3$ completely reacts with

$RNA$ and $DNA$ are chiral molecules, their chirality is due to

For the following: (a) $I^-$ (b) $Cl^-$ (c) $Br^-$ The increasing order of nucleophilicity would be:

Consider the following sets of quantum number:

	n	$\ell$	m	s
(a)	3	0	0	$+1 / 2$
(b)	2	2	1	$+1 / 2$
(c)	4	3	-2	$-1 / 2$
(d)	1	0	-1	$-1 / 2$
(e)	3	2	3	$+1 / 2$

Which of the following sets of quantum number is not possible:

Which one of the following is a correct statement?

Which one of the following shows maximum value of paramagnetic behaviour?

The number of moles of $KMnO_4$ that will be needed to react with one mole of sulphite ion in acidic solution is

The enthalpy of hydrogenation of cyclohexene is $-119.5\, kJ\, mol ^{-1}$. If resonance energy of benzene is $-150.4\, kJ\, mol ^{-1}$, its enthalpy of hydrogenation would be

The colloidal system of a solid dispersed in liquid medium, is called

The presence of electric charge on colloidal particles is indicated by the property, called

What is the fuel of atomic pile ?

Pure water does not conduct electricity because it is

The radius of the first Bohr orbit of hydrogen atom is $ 0.529\overset{\text{o}}{\mathop{\text{A}}}\, $ . The radius of the third orbit of $ {{He}^{+}} $ will be

Two liquid drops have diameters of $1\, cm$ and $1.5\, cm$ The ratio of excess of pressures inside them is

The protective action of different lyophilic colloids is expressed in terms of

The reaction intermediate produced, by homolytic cleavage of a bond is called

The oxidation state of chromium in chromium trioxide is

The catalyst used in the manufacture of $H_{2}SO_{4}$ by contact process is

The osmotic pressure is expressed in the units of

Nucleotide consists of

The hybridisation of the ipso-carbon in chlorobenzene is

Monel metal is an alloy of