List of top Chemistry Questions

$CH _{3} COCH _{3}$ can be converted to $CH _{3} CH _{2} CH _{3}$ by the action of

Azimuthal quantum number defines

Potassium and caesium are used in photoelectric cells. Potassium and caesium emit electrons on exposure to light.

Physical absorption of molecules takes place on surface only In this process, the bonds of the absorbed molecules are broken.

Phenol is a weaker acid than ethanol. Groups with $+M$ effect and $-I$ effect decrease acidity at $m$-position.

During an adiabatic process, heat energy is not exchanged between system and its surroundings. The temperature of a gas increases when it undergoes an adiabatic expansion.

Diamond is a bad conductor. Graphite is a good conductor.

Cuprous ion $(Cu^+ )$ is colourless whereas cupric ion $(Cu^{++} )$ is blue in the aqueous solution. Cuprous ion $(Cu^+ )$ has unpaired electrons while cupric ion $(Cu^{++} )$ does not.

Absorption spectrum consists of some bright lines separated by dark spaces. Emission spectrum consists of dark lines.

Spectrum of $Li^{2+}$ is similar to that of

The correct order of solubility in water for $He, Ne, Ar, Kr, Xe$ is

If $P$ is pressure and $\rho$ is density of a gas, then $P$ and $\rho$ are related as

The intermediate formed in aldol condensation is

The compound most suitable for the preparation of cyanohydrin is

Absolute values of internal energy of substances can not be determined. It is impossible to determine exact values of constituent energies of the substances.

Which of the following electronic configurations has maximum energy?

Alum helps in purifying water by

Number of electrons transferred in each case when $KMnO_4$ acts as an oxidising agent to give $MnO_2,Mn^{2+},Mn(OH)_3$ and $MnO^{2-}_4$ are repectively

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, $K^+, Ca^{2+}, Mg^{2+}, Be^{2+}$

Which of the following species represent the example of $dsp^2$ -hybridization ?

Zn gives $H_2$ gas with $H_2SO_4$ and HCI but not with $HNO_3$ because :-

Which is most basic ?

IUPAC name of the following is $ CH_2=CH-CH_2CH_2-C \equiv CH $

In the following reaction, product 'P' is :-

In borax bead test which compound is formed?