List of top Chemistry Questions

Match the following reactions with the corresponding reagents} Reactions \hspace{3cm} Reagents} (a) Oxidation of secondary alcohols to ketones \hspace{0.3cm} (i) $85%\,H_3PO_4,\ 440K$} (b) Dehydration of secondary alcohols to alkenes \hspace{0.1cm} (ii) $Na_2Cr_2O_7/H_2SO_4$} (c) Reduction of ketones to secondary alcohols \hspace{0.5cm} (iii) Chromic anhydride} (d) Oxidation of phenol to benzoquinone \hspace{0.2cm} (iv) $NaBH_4$

Which of the following is NOT correctly matched for the compound and use mentioned below?

In aldol condensation reaction, 1,3-diphenylprop-2-en-1-one is obtained as major product in the reaction between

The major products formed by heating $C_6H_5CH_2-O-C_6H_5$ with HI are

The order of field strength of the following ligands in the spectrochemical series is

Match the following:} Compound \hspace{2cm} Use} (a) Methylene chloride \hspace{0.8cm} (i) Solvent for iodine} (b) Chloroform \hspace{1.8cm} (ii) Manufacture of propellents} (c) Iodoform \hspace{2cm} (iii) Metal cleaning} (d) Carbon tetrachloride \hspace{0.6cm} (iv) Antiseptic

The number of possible structural isomers of $C_3H_6Cl_2$ are

One mole of an alkene on ozonolysis gives one mole of propanal and one mole of pent-3-one. The alkene is

The technique used to purify liquids having very high boiling points and decompose at or below their boiling point is

Which of the following metal is incorporated into the electrodes of fuel cell to increase the rate of reaction?

A reaction is third order with respect to a reactant. If the concentration of the reactant is doubled, the rate of reaction increased by

The rate constant of a reaction at $400$ K and $500$ K are $0.04$ min$^{-1}$ and $0.08$ min$^{-1}$ respectively. The activation energy of the reaction is about \ ($2.303R=19$ J K$^{-1}$ mol$^{-1}$, $\log 2 = 0.3010$)

IUPAC name of $[CoCl_2(en)_2]Cl$ is

$3$ g of benzoic acid dissolved in $25$ g of benzene shows a depression in freezing point equal to $2.5$ K. What is the experimental molar mass of benzoic acid in benzene? \ (Molal depression constant for benzene is $5$ K kg mol$^{-1}$)

The correct order of standard electrode potentials of the following transition elements is

$CO_2$ is taken in a closed container at $1500$ K and at a pressure of $0.6$ bar. When a certain amount of carbon is added to the system at equilibrium some of $CO_2$ is converted into $CO$ and the equilibrium pressure is $0.9$ bar. What is the $K_p$ value at $1500$ K for the equilibrium $CO_2(g)+C(s)\rightleftharpoons2CO(g)$?

The $\Delta G^\circ$ for the reaction $3X(g)+2Y(g)\rightarrow3Z(g)$ at $298K$ is ($\Delta H^\circ=-13$ kJ mol$^{-1}$ and $\Delta S^\circ=-45$ J K$^{-1}$ mol$^{-1}$)

In the reaction $O_2(g)+4H^+(aq)+4e^- \rightarrow 2H_2O(l)$, the quantity of electricity needed to reduce one mole of gaseous oxygen is $(E^\circ_{cell}=1.23V)$

The quantity of heat necessary to raise the temperature of $60$ g of metal X from $30^\circ C$ to $54^\circ C$ is (Molar heat capacity of metal X = $25$ J mol$^{-1}$ K$^{-1}$ and molar mass = $30$ g mol$^{-1}$)

Which of the following molecule has double bond with two $\pi$ bonds?

For the equilibrium, $2A(g)\rightleftharpoons 2B(g)+C(g)$, the value of the equilibrium constant $K_p$ is $0.1662$ atm at $1000$ K. The value of $K_c$ for the equilibrium at the same temperature is $(R=0.0831$ L atm mol$^{-1}$ K$^{-1})$

Which of the following ions are isoelectronic?

The correct increasing order of number of electrons around the central atom in the following molecules is

The mass of sodium acetate required to prepare $250$ mL of $0.4$ M aqueous solution is \ (Molar mass of sodium acetate = $82$ g mol$^{-1}$)

The correct order of metallic radius of the elements is