List of top Chemistry Questions

Which one of the following has unit positive charge and $1$ amu mass?

In which of the following complex ion, the central metal ion is in a state of $sp^3d^2$ hybridisation ?

The increase of pressure on ice ? water at a constant temperature will cause

The order of the reaction $N_2O_5 \, \rightarrow \, N_2O_4(g) + \frac{1}{2}O_2(g)$ is

Schottky defect in solids is due to

The reaction ${B(OH)_3 + NaOH <=> Na[B(OH)_4]}$ $ { B(OH)_3 + NaOH <=> NaBO_2 + 2 \, H_2O}$ can be made to proceed to forward direction by the addition of

Among the following, the species having square planar geometry for central atom are: (i) $XeF _{4}$ (ii) $SF _{4}$ (iii) $\left[ NiCl _{4}\right]^{2-}$ (iv) $\left[ PtCl _{4}\right]^{2-}$

A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will:

Which of the following can give a Grignard reagent when reacted with magnesium m dry ether?

Match the following lists:

The bond angle in $ \text{As}{{\text{H}}_{\text{3}}} $ is greater than that in:

Acidified $ \text{KMn}{{\text{O}}_{\text{4}}} $ oxidises oxalic acid to $ \text{C}{{\text{O}}_{2}}. $ What is the volume (in litres) of $ {{10}^{-4}}\text{M}\,\text{KMn}{{\text{O}}_{\text{4}}} $ required to completely oxidise 0.5 L of $ {{10}^{-2}}\text{M} $ oxalic acid in acid medium?

What is X in the following reaction? $ KHS{{O}_{4}}+{{F}_{2}}\xrightarrow{{}}HF+X $

For the reaction $CH_{4}(g)+2O_2(g) {<=>}CO_2(g)+2H_2O(\ell) \Delta H_{r} =-170.8\,KJ\,mol^{-1}$ Which of the following statements is not true:

Which one of the following orders is not in accordance with the property stated against it?

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is :-

The correct order of the mobility of the alkali metal ions in aqueous solution is

The correct order regarding the electronegativity of hybrid orbitals of carbon is

6 moles of an ideal gas expand isothermally and reversibly from a volume of 1 litre to a volume of 10 litres at 27?C. What is the maximum work done?

$[NH(CH_2)NHCO(CH_2)_4CO]_{n}$ is a:-

Addition of $ SnC{{l}_{2}} $ to $ HgCl_2$ gives precipitate:

In fermentation by zymase, alcohol and $ C{{O}_{2}} $ are obtained from:

Which will reduce zinc oxide to zinc?

By Wurtz reaction, a mixture of methyl iodide and ethyl iodide gives :

The enthalpy of hydrogenation of cyclohexene is $-119.5 kJ mol ^{-1} .$ If resonance energy of benzene is $-150.4 kJ mol ^{-1}$, its enthalpy of hydrogenation would be:-