List of top Chemistry Questions asked in KEAM

The standard enthalpy of formation of CH₄(g), CO₂(g) and H₂O(I) are -75 kJ mol^-1, -393 kJ mol^-1 and -286 kJ mol^-1 respectively. The amount of heat liberated (in kJ) when 3.2g of methane gas is burnt under standard conditions is

From the following, choose the correct structures of chloroxylenol and terpineol, which are the constituents of "Dettol"

The dipole-dipole interaction energy between rotation polar molecules is proportional to___, where 'r' is the distance between polar molecules.

Which one of the following molecules contains an incomplete octet of the central atom?

A particle of mass 6.6×10^-31kg is moving with a velocity of 1×10⁷ms^-1. The de Broglie wavelength (in A) associated with the particle, is (h=6.6×10^-34 Js)

Among the following pairs of compounds, the one that does not illustrate the law of multiple proportions, is

Which one of the following contains the highest number of oxygen atoms?

"No two electrons in an atom can have the same set of four quantum numbers." This is known as

The first ionisation enthalpy is the least in

In the estimation of nitrogen present in an organic compound, Kjeldahl's method cannot be applied to

In which one of the following complexes, the conductivity corresponds to 1:2 electrolyte in aqueous solution?

The metal that has the highest melting point in the first series of transition elements is

Which one of the following is an ore of aluminium?

In the first row transition metals, the element that exhibits only +3 oxidation state is

The complex ion formed when the film developed in black and white photography is washed with hypo solution is

Among the following, the alkene that exhibits optical isomerism is

When zinc metal is reacted with aqueous sodium hydroxide, the products formed are

Choose the wrong statement in the following with regard to orthoboric acid:

Which one of the following is true?

'Syngas' produced from sewage is a gaseous mixture of

The magnetic moment of a trivalent ion of a metal with Z = 24 in aqueous solution is

Match the substances and their uses.

Column-I		Column-II
a	Silicones	i	Cracking of hydrocarbons
b	Zeolites	ii	Light composite material for aircraft
c	Quartz	iii	Flux for soldering metals
d	Borax	iv	Waterproofing of fabrics
e	Boron fibres	v	Piezoelectric material

Choose the correct options :

Choose the correct choice containing true statements regarding $PCI_5$.
(i) PCI, is prepared by the reaction of white phosphorus with excess of dry chlorine. 
(ii) The complete hydrolysis of PCI, gives phosphoric acid.  
(iii) PCI, has square pyramidal structure in gaseous phase. 
(iv) All the five bonds in PCI, molecule are equivalent.

Which of the following is an example of disproportionation redox reaction? 

The following concentrations were obtained for the formation of $NH_3(g)$ from $N_2(g)$ and $H_2(g)$ at equilibrium and at 500K: $[N_2] 1×10^{-2} M, [H_2] -2×10^{-2} M$ and $[NH_3]=2×10^{-2} M$. The equilibrium constant, K., for the reaction
$N_2(g)+3H_2(g)2NH; (g)$ at 500K is