List of top Chemistry Questions

Which one of the following molecules is planar?
The IUPAC name of the compound, $ {{C}_{2}}{{H}_{5}}NHCOC{{H}_{3}} $ is:
On heating one end of a piece of a metal, the other end becomes hot because of
The number of possible isomers of the compound with molecular formula $C_7H_8 O$ is
The normal boiling point of water is 373 K(at 760 mm). Vapour pressure of water at 298 K is 23 mm. If enthalpy of vaporisation is 40.656 kJ the boiling point of water at 23 mm atmospheric pressure will be
The $ BCl_3$ is a planar molecule whereas $NCl_3$ is pyramidal because
The correct order of the $O - O$ bond length in $O_2,H_2 O_2 $ and $O_3 $ is
If enthalpies of formation for $C _{2} H _{4}(g), CO _{2( g )}$ and $H _{2} O _{(1)}$ at $25^{\circ} C$ and $1\, atm$ pressure are $52,-394$ and - $286\, kJ / mol$ respectively, then enthalpy of combustion of $C _{2} H _{4}( g )$ will be
The concentration units independent of temperature would be
The percentage weight of Zn in white vitriol $[ZnSO_4 . 7H_2O]$ is approximately equal to $(at. \, mass\, of \, Zn= 65, S=32, 0=16 \, and \, H= 1)$
Stainless steel contains iron and
The loss of electron is termed as
The number of geometrical isomers for [Pt(NH3)2Cl2] is
The oxidation number of chromium in potassium dichromate is
The number of moles of oxygen in 1 L of air containing 21% oxygen by volume, under standard conditions, is
The radius of hydrogen atom in the ground state is 0.53 $\mathring{A}.$ The radius of $Li^{2+}$ ion (at. no. = 3) in a similar state is
A reaction occurs spontaneously if :
Which of the following is a redox reaction ?
If a beam of light is passed through true solution, it is
Which of the following is the anhydride of sulphuric acid?
About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?
Which of the following protein destroy the antigen when it enters in body cell?
500 mL of nitrogen at $27^\circ C$ is cooled to $-5^\circ C$ at the same pressure. The new volume becomes

The oxide which cannot act as a reducing agent is

The $\alpha$-D-glucose and $\beta$-D-glucose differ from each other due to difference in carbon atom with respect to its