List of top Chemistry Questions

Dimension of universal gas constant $(R)$ is

The product of reaction between aniline and acetic anhydride is

The correct order of electron gain enthalpy $ (\Delta _{eg}H) $ of the halogen atoms is

The $ C-H $ bond distance is the longest in

$50\, mL$ of each gas A and of gas B takes $150$ and $200\, s$ respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is $36,$ the molecular mass of gas A will be

The element with positive electron gain enthalpy is

One mole of propanone and one mole of formaldehyde are the products of ozonolysis of one mole of an alkene. The alkene may be

The dissolution of a gas in a liquid is governed by

$2$ -bromobutane reacts with $OH ^{-}$ in $H _{2} O$ to give $2$ -butanol. The reaction involves

Glucose can be converted into ethyl alcohol using

The rate of reactions exhibiting negative activation energy

The correct order of increasing oxidizing power in the series is

A compound with nitro group was reduced by $Sn / HCl$, followed by treatment with $NaNO _{2} / HCl$ and followed by phenol. The chromophore group in the final compound is

Addition of a non-volatile solute in a volatile ideal solvent

Standard electrode potential of half-cell reactions are given below $C u^{2+}+2 e^{-} \rightarrow C u ; E^{\circ}=0.34\, V $ $Z n^{2+}+2 e^{-} \rightarrow Z n ; E^{\circ}=-0.76 \,V$ What is the emf of the cell?

Avogadro number $\left(6.023 \times 10^{23}\right)$ of carbon atoms are present in

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number ?

In a reaction, A + B $\rightarrow$ Product, rate is doubled when the concentration of B is doubled and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as

Desalination of sea water can be done by

The effective atomic number for $\left[R h\left(H_{2} O\right)_{6}\right]^{3+}$ (at. no. for $R h$ is $45$ ) is

Boron is unable to form $BF _{6}^{3}$ because of

Number of atoms in 560 $cm^3$ of oxygen at S.T.P. is

The volume of $CO_2$ (in $cm^3$) liberated at S.T.P. when 1.06 g of anhydrous sodium carbonate is treated with excess of dilute HCl is [atomic mass of Na= 23]

The temperature of one mole of an ideal gas increases from 298 K when it absorbs 200 J of heat at constant volume. The change in the internal energy of the gas is

The enthalpy of neutralization of HCI and NaOH is x kJ. The heat evolved when 500 ml of 2 N HCl is mixed with 250 mt of 4 N NaOH will be