List of top Chemistry Questions

Using MOT, compare $O_2^+$ and $O_2^-$ species and choose the incorrect option.

One of the following amide will not undergo Hoffmann bromamide reaction :

In a first order reaction, the concentration of the reactant is reduced to $12.5\%$ in one hour. When was it half completed ?

For the reaction $A+2 B \longrightarrow C$, the reaction rate is doubled, if the concentration of $A$ is doubled. The rate is increased by four times when concentrations of both $A$ and $B$ are increased by four times. The order of the reaction is

The RMS velocity of $CO$ gas molecules at $27^{\circ}$C is approximately $1000\, m/s$. For $N_2$ molecules at $600 \,K$ the RMS velocity is approximately

Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z . X, Y$ and $Z$ respectively are

For the given reaction, $H _{2}( g )+ Cl _{2}( g )->2 H ^{+}( aq )+2 Cl ^{-}( aq ) ; \Delta G ^{\circ}=--262 \cdot 4 kJ$ The value of free energy of formation $\left(\Delta G_{f}^{\circ}\right)$ for the ion $C l^{-1}(a q)$, therefore will be

Metal carbonyls are stable due to

Shape of $SF_{4}$ is

For an adiabatic change in a system, the condition which is applicable will be

The two functional groups present in a typical carbohydrate are

The number of possible alcohol isomers for $ C_4H_{10}O $ is

The oxidation state of potassium in $KO_{2}$ is

Intramolecular hydrogen bonding is found in

The type of bonds present in $CuSO_4�5H_2O$ are _________.

An endothermic reaction is found to have $+ve$ entropy change. The reaction will be

For one mole of $ {NaCl_{(s)}}$ the lattice enthalpy is

$ 2 \,g $ of benzoic acid $ (C_6H_6COOH) $ is dissolved in $ 25\, g $ of benzene. The observed molar mass of benzoic acid is found to be $ 241.98 $ . What is the percentage association of acid if it forms in solution?

The pair of compound which cannot exist together in solution is

$ 0.6 \,mL $ of acetic acid is dissolved in $ 1 \,L $ of water. The value of van?t Hoff factor is $ 1.04 $ . What will be the degree of dissociation of the acetic acid?

What is the mole fraction of the solute in $ 2.5 $ molal aqueous solution?

Which of the following statement is true ?

Boiling point of chloroform was raised by $0.323 \,K$, when $0.5143\, g$ of anthracene was dissolved in its $35 \,g$. Molecular mass of anthracene is $(K_b$ for $CHCl_3 = 3.9 \,K \,kg\,, mol^{-1})$

Setting of plaster of Paris is

A catalyst only