List of top Chemistry Questions

Frenkel defect is generally observed in
Most crystals show good cleavage because their atoms, ions or molecules are
Which of the following compounds is not coloured?
How many isomeric vicinal-dihalides are possible for the compound having molecular formula $ C_3H_6C_{12} $ ?
Given, for $ Sn^{4+}/Sn^{2+} $ , standard reduction potential is $ 0.15 \,V $ and for $ Au^{3+}/Au $ , standard reduction potential is $ 1.5\, V $ . For the reaction, $ {3Sn^{2+} + 2Au^{3+} -> 3Sn^{4+} + 2Au } $ , the value of $ E^{\circ}_{cell} $ is,
Among the elements $Ca, Mg, P$ and $Cl$, the order of increasing atomic radii is -
Among the following which one has the highest cation to anion size ratio?
The blood cells retain their normal shape in solutions which are
Some statements about water are given below: (a) Heavy water is used as a moderator in nuclear reactors (b) Heavy water is more associated than ordinary water (c) Heavy water is more effective solvent than ordinary water. Which of the above statements are correct ?
How many bridging oxygen atoms are present in ${P_4 O_{10}}$ ?
Glucose on reaction with Fehling solution gives
On mixing certain alkane with chlorine and irradiating it with ultraviolet light,it forms only one mono-chloroalkane. The alkane is :
The correct order of increasing bond angles in the following species is
The number of atoms in $0.1$ mole of a triatomic gas is $(N_A = 6.023 \times 10^{23} \, mol ^{-1})$
The reaction ${ 2A_{(g)} + B_{(g)} <=> 3C_{(g)} + D_{(g)}}$ is begun with the concentrations of $A$ and $B$ both at an intial value of $1.00\, M$. When equilibrium is reached, the concentration of $D$ is measured and found to be $0.25 \,M$. The value for the equilibrium constant for this reaction is given by the expression.
Three moles of an ideal gas expanded spontaneously into vaccum. The work done will be
Standard entropies of $X_2 ,Y_2$ and $XY_3$ are $60 , 40 $ and $ 50 \, JK^{-1} mol^{-1}$ respectively. For the reaction $ { \frac{1}{2} X_2 + \frac{3}{2}Y_2 <=> XY_3, \Delta H = -30 kJ}$ to be at equilibrium, the temperature should be
The reaction of toluene with $Cl_2$ in the presence of $FeCl_3$ gives 'X' and reaction in presence of light gives 'Y' Thus, 'X' and 'Y' are
Given are cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV). In these, the order of decreasing acidic character will be
The first order integrated rate equation is
The unit of specific conductivity is
For one mole of an ideal gas, increasing the temperature from $10^\circ C \, to\, 20^\circ C$________
$50 \, cm^3\; of\; 0.2 \, N \, HCl$ is titrated against $0.1 \, N \, NaOH$ solution. The titration is discontinued after adding $50\,cm^3 \; of\; NaOH$. The remaining titration is completed by adding $0.5\, N\, KOH$. The volume of $KOH$ required for completing the titration is
The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of ${CO_2}$ is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A. The compound A is -
Methyl bromide reacts with $AgF$ to give methyl fluoride and silver bromide. This reaction is called