List of top Chemistry Questions

If the atomic number of an element is 33, it will be placed in the periodic table in the

$Na^+, Mg^{2+}, Al^3+ \, and \, Si^{4+}$ are isoelectronic. The order of their ionic size is

Enzymes take part in a reaction and

Benzene reacts with n-propyl chloride in the presence of anhydrous $AlCl_3$ to give

If ionisation potential for hydrogen atom is 13.6 eV, then ionisation potential for $He^+$ will be

A1 is more reactive than Fe but A1 is less'-easily corroded than Fe because

Which of the following species has four lone pairs of electrons?

Which of the following noble gas is not present in atmosphere ?

Internal energy and pressure of a gas per unit volume are related as

When is the deviation more in the behaviour of a gas from the ideal gas equation pV = nRT?

The catalyst used in the manufacture of polyethene by Zeigler method is

The osmotic pressure of a solution can be increased by

The number of hydroxyl groups in pyrophosphoric acid is

The solubility of AgCl will be minimum in

When $I_2$ is dissolved in $CCI_4$ the colour that results is

The number of unpaired electrons in $Zn^{2+}$ is

Reduction of 2-butyne with sodium in liquid ammonia gives predominantly

Which one of the following on oxidation gives a ketone?

Which of the following fertilizers has the highest nitrogen percentage ?

When $CuSO_4 $ is electrolysed using platinum electrodes?

What is formed when a primary alcohol undergoes catalytic dehydrogenation?

In the fluorite structure, the coordination number of $ Ca^{2+}$ ion is

Which one of the following has the smallest heat of hydrogenation per mole ?

Equal weights of ethane and hydrogen are mixed in an empty container at $25^\circ$ C. The fraction of the total pressure exerted by hydrogen is

Increasing order of acidic strength among p-methoxy phenol (I), p-methyl phenol (II) and p-nitrophenol (III) is