List of top Chemistry Questions

Which of the following pairs of ions are isoelectronic and isostructural ?
An alloy of copper, silver and gold is found to have copper atom constituting the ccp lattice. If silver atom occupy the edge centres and gold atom is present at body centred, the alloy has a formula
A mixture of methylamine and dimethylamine is given to you. The reagents used to separate the components of the mixture are
The distinguishing test between methanoic acid and ethanoic acid is
Half-life period of a first order reaction is $10\, min$. Starting with initial concentration $12\, M$, the rate after $20\, min$ is
Molar enthalpy change for melting of ice is $6\, kJ / mol$. Then the internal energy change (in $k J / mol$ ) when $1$ mole of water is converted into ice at $1$ atm at $0^{\circ} C$ is Empty QImg
Which of the following options represents the correct bond order ?
How does the electron gain enthalpies vary across a period and down a group?
If the solubility of a sparingly soluble salt $AX _{2}$ is $s\, mol / L$, the solubility product is
Among $P, S, Cl, F$, the elements with most negative and least negative electron gain enthalpy respectively, are
The species which cannot serve as an initiator for the free radical polymerisation, is
The number of $Na$ atom in $46\, g \,Na$ (atomic weight of $Na= 23$) is
Among second period elements/the correct order for first ionisation enthalpy is
Nylon is a
$H A$ is a weak acid. At $25^{\circ} C$, the molar conductivity of $0.02\, M\, H A$ is $150\, \Omega^{-1} cm ^{2} mol ^{-1}$. If its $\Lambda_{ m }^{ o }$ is $300\, \Omega^{-1} cm ^{2} mol ^{-1}$, then equilibrium constant of $H A$ dissociation is
$K_{p} / K_{c}$ for the reaction $A(g)+2 B_{2}(g) \rightleftharpoons A B_{2}(g)$ is
n-hexane on heating to $773 \,K$ at $10-20$ atmospheric pressure in the presence of oxides of vanadium supported over alumina, yields
A gas at high temperature is cooled. The highest temperature at which liquefaction of gas first occurs is called
The compound formed upon combustion of potassium metal in excess air is
The number of tetrahedral and octahedral void per unit cell of cubic closed packed structure is
When the following amide is treated with $Br_{2}/KOH$, it gives
In an acidified aqueous solution of $Mn ^{2+}, Ni ^{2+}, Cu ^{2+}$ and $Hg ^{2+}$ ions, $H _{2} S$ gas was passed. Precipitates are
One mole of NaCl contains 6.023 ??10 molecules of sodium chloride. 58.5 g of NaCl also contains 6.023 ??10 molecules of NaCl.
A gas such as carbon monoxide would be most likely to obey the ideal gas law at :
Decreasing order of stability of $O_2, O^-_2, O_2^+ $ and ${ O_2^{2-}}$ is :