List of top Chemistry Questions

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
The effective atomic number for $\left[R h\left(H_{2} O\right)_{6}\right]^{3+}$ (at. no. for $R h$ is $45$ ) is
Desalination of sea water can be done by
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
IUPAC name of $ {[CrCl_2(NH3)4]NO_3}$ is
The atomic number of the element with highest ionization energy among the following is
The heat of formation of $ {H_2O_{(l)}}$ is -286 kJ. The? heat of formation of $ { H_2O_{(g)}}$ is likely to be
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
Which one of the following ores is obtained by floatation process?
For the dissociation of limestone in the slag zone of the blast furnace, the reaction is
The oxidation number of oxygen is -1 in
The conjugate acid of $ NH_2^- $ is
Two ions $A^+$ and $B^-$ have radii 104 and 200 pm respectively, in a cubic close packed crystal of compound AB. The co-ordination no. of A is