List of top Chemistry Questions

Which one of the following has unit positive charge and $1$ amu mass?
The enthalpy and entropy change for the reaction : Br2(l) + Cl2(g) → 2BrCl(g) are 30 kJ mol-1 and 105 JK-1 mol-1 respectively. The temperature at which the reaction will be in equilibrium is :
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
Schottky defect in solids is due to
The order of the reaction $N_2O_5 \, \rightarrow \, N_2O_4(g) + \frac{1}{2}O_2(g)$ is
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?
What amount of bromine will be required to convert 2 g of phenol into 2,4,6-tribromo phenol ?
Match the following lists:
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?
The bond angle in $ \text{As}{{\text{H}}_{\text{3}}} $ is greater than that in:
What is X in the following reaction? $ KHS{{O}_{4}}+{{F}_{2}}\xrightarrow{{}}HF+X $
[Cr(H2O)6]Cl3 (at. no. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution of 3d electrons in the chromium of the complex is:
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 :-
Photochemical smog pollution does not contain:
A plot of \(log\ \frac {x}{m}\) versus \(log \ p\) for the adsorption of a gas on a solid gives a straight line with slope equal to:
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:-