List of top Chemistry Questions

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

A nuclear reaction of $^{235}_{92}U$ with a neutron produces $^{90}_{36}Kr$ and two neutrons. Other element produced in this reaction 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

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

The oxidation state of chromium in chromium trioxide is

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 hybridisation of the ipso-carbon in chlorobenzene is

The osmotic pressure is expressed in the units of

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

Nucleotide consists of

Monel metal is an alloy of