List of top Chemistry Questions

The number of $Na$ atom in $46\, g \,Na$ (atomic weight of $Na= 23$) is
If the solubility of a sparingly soluble salt $AX _{2}$ is $s\, mol / L$, the solubility product is
The species which cannot serve as an initiator for the free radical polymerisation, is
Among second period elements/the correct order for first ionisation enthalpy is
$H A$ 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
Nylon is a
$K_{p} / K_{c}$ 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
In an acidified aqueous solution of $Mn ^{2+}, Ni ^{2+}, Cu ^{2+}$ and $Hg ^{2+}$ ions, $H _{2} S$ gas was passed. Precipitates are
When the following amide is treated with $Br_{2}/KOH$, it gives
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.
Glycogen is
Which of the following compounds is responsible for depletion of ozone layer?
$\lambda^{\circ}_m$ for $ {NH_4Cl, NaOH}$ and $ {NaCl}$ are $130, 248$ and $ {126.5\, ohm^{-1} \, cm^2 \, mol^{-1}}$ respectively. The $\lambda^{\circ}_m$ of $ {NH_4OH}$
Consider the acid strength of the carboxylic acids: (i) $ {PhCOOH}$ (ii) $o - { NO_2C_6H_4COOH}$ (iii) $p- {NO_2C_6H_4COOH}$ (iv) $m- {NO_2C_6H_4COOH}$
Sulphur sol is an example of
Gabriel phthalimide synthesis is used for the preparation of
The decreasing order of reactivity towards electrophilic substitution of the following compounds is
$Nylon-6,6$ is an example of a polymer formed by
Strongest reducing agent among the following is (i) $ {Na^+ + e^- ->Na_{(s)} \:\: E^{\circ} = - 2.71 \, V}$ (ii) $ {Al^{3+} + 3e^- ->Al_{(s)} \:\: E^{\circ} = - 1.66 \, V}$ (iii) $ {F_{2(g)} + 2e^- ->2F^- \:\: E^{\circ} = + 2.87 \, V}$ (iv) ${2H_2 O+ 2e^- ->H_{2(g)} + 2OH^-_{(aq)} \:\: E^{\circ} = - 0.83\, V}$
The cathode reaction in the dry cell will be
The mass of oxygen gas which occupies $5.6$ litres at STP would be