List of top Chemistry Questions

The noble gas which is radioactive is

Effective nuclear charge $\left(Z_{eff} \right)$ for a nucleus of an atom is defined as

Which of the following is the hydrophobic synthetic acrylate polymer that has glass-transition temperature of about 10°C?

In a reaction carried out at 400 K, 0.01% of the total collisions are effective. What is the energy of activation of the reaction?

Consider the following metallurgical processes:(A) Heating impure metal with CO and distilling the resulting volatile carbonyl compound, which is finally decomposed at 150^oC - 200^oC to get pure metal.(B) Heating the sulphide ore in air until a fraction of it is converted to its oxide and then further heating in the absence of air to allow the oxide to react with unchanged metal sulphide and reduce it to the metallic state.(C) Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride and NaCl to obtain the metal.The processes used for obtaining Mg, Ni and Cu, respectively, are

The percentage by volume of C3H8 in a mixture of C3H8, CH4 and CO is 36.5. Calculate the volume of CO2 produced when 100 ml of the mixture is burnt in excess of O2.

$E^{\circ}$ values of three metals are listed below. $Zn^{2+}_{\left(aq\right)}+2e^{-} \to Zn_{\left(s\right)};\quad E^{\circ}=-0.76\,V$ $Fe^{2+}_{\left(aq\right)}+2e^{-} \to2Fe_{\left(s\right)}; \quad E^{\circ}=-0.44\,V$ $Sn^{2+}_{\left(aq\right)}+2e^{-} \to Sn_{\left(s\right)}; \quad E^{\circ}=-0.14\,V$ Which of the following statements are correct on the basis of the above information? (i) Zinc will be corroded in preference to iron if zinc coating is broken on the surface. (ii) If iron is coated with tin and the coating is broken on the surface then iron will be corroded. (iii) Zinc is more reactive than iron but tin is less reactive than iron.

The more positive the value of $E^{\circ}$, the greater is the tendency of the species to get reduced. Using the. standard electrode potential of redox couples given below find out which of the following is the strongest oxidising agent. $E^{\circ}$ values : $Fe^{3+}/Fe^{2+} = + 0.77; I_{2\left(s\right)}/I^- = + 0.54$; $Cu^{2+}/Cu = + 0.34$; $Ag^{+}/Ag = + 0.80\, V$

The solubility product of silver chromate is $4 \times 10^{-12}$. The molar solubility of the salt is

During osmosis,flow of water through a semipermeable membrane is

The molarity of 98% $H_2SO_4$ (d = 1.8 g/mL) by weight is

Dissociation constants of $CH_3COOH$ and $NH_4OH$ in aqueous solution are $10^{-5}$. If $pH$ of a $CH_3COOH$ solution is $3$, What will be the $pH$ of $NH_4OH$?

$C - C$ bond order in benzene is

Electrolytic decarboxylation of sodium propionate produces

During electrolysis of a solution of $AgNO_3$, $9650$ coulombs of charge is passed through the solution. What will be the mass of silver deposited on the cathode?

Duraluminium is an alloy of

Which one of the following produces acyl halide by treatment with $ {PCl_5}$?

The electronic configuration of two elements $X$ and $Y$ is given below : $X=1s^{2}$, $2s^{2}2p^{6}$, $3s^{2}3p^{6}$, $4s^{2}$ $Y=1s^{2}$, $2s^{2}2p^{6}$, $3s^{2}3p^{5}$ The formula of the ionic compound that can be formed between these elements is

If $K_1$ and $K_2$ are the respective equilibrium constants for the two reactions. $ {XeF6_{(g)} +H2O_{(g)}<=> XeOF4_{(g)} +2HF_{(g)}}$ $ {XeO4_{(g)} +XeF6_{(g)} <=> XeOF4_{(g)} +XeO3F2_{(g)}}$ The equilibrium constant for the reaction, $ {XeO4_{(g)} +2HF_{(g)} <=> XeO3F2_{(g)} +H2O_{(g)}}$ is

The vapour pressure of water is 12.3 kPa at 300 K. The V.P. of 1 M solution of a non-volatilenon electrolyte solution is

Chlorine exists in two isotopic forms, $Cl-37$ and $Cl-35$ but its atomic mass is $35.5$. This indicates the ratio of $Cl-37$ and $Cl-35$ is approximately

The atomicity of nitrogen and phosphorus is respectively

A container of volume V, contains 0.28 g of $N_2$ gas. If same volume of an unknown gas under similar conditions of temperature and pressure weighs 0.44g, the molecular mass of the gas is

Equivalent weight of hydrated (crystalline) oxalic acid is

Preparation of ethers by reacting sodium alkoxide with alkyl halides is called