List of top Chemistry Questions

Which of the following is not isostructural with \(\text{SiCl}_4\) ?

The pair in which both species have same magnetic moment (spin only value) is

$ CH_3 - CH = CH_2+NOCl \longrightarrow P; $ Identify the adduct.

The atomic numbers of $Ni$ and $Cu$ are $28$ and $29$ respectively. The electron configuration $Is^2 2s^2 2p^6 3s^2 3p^6 3d^{10}$ represents

Aspirin is:

Which of the following metals is most reactive towards water?

The pyrimidine bases present in DNA are :

For a spontaneous reaction, free energy

In the reaction, $C_{(s)} + O_{2(g)} \to CO_{2(g)}$

What is the effect of dilution on the equivalent conductance of strong electrolyte?

$4$ moles each of $S O_{2}$ and $O_{2}$ gases are allowed to react to form $SO_{3}$ in a closed vessel. At equilibrium $25 \%$ of $O_{2}$ is used up. The total number of moles of all the gases present at equilibrium is

If for a sucrose solution, elevation in boiling point is $0.1^{\circ} C, $ then what will be the boiling point of $NaCl$ solution for same molal concentration?

A $5 \%$ solution (by mass) of cane sugar in water has freezing point of $271 \,K$ and freezing point of pure water is $273.15 \,K$. The freezing point of a $5 \%$ solution (by mass) of glucose in water is

The water pouch of instant cold pack for treating athletic injuries breaks when squeezed and $NH_4NO_3$ dissolves lowering the temperature. Addition of nonvolatile solute into solvent results into depression of freezing point of solvent.

$ 35.4\,\,mL $ of $ HCl $ is required for the neutralization of a solution containing $0.275 \,g$ of sodium hydroxide. The normality of hydrochloric add is?

Which of the following does not effect half-life of first order reaction?

Half-life of a substance is 6 min. If its initial amount is 32 g, then amount present after 18 minis:

The rate constant of a reaction is $2.3\times10^{-2} mol^{-2} L^{2} min^{-1}.$ The order of reaction is

The rate constant for a first order reaction whose half-life, is $480\, s$ is:

According to transition state theory, for the formation of an activated complex, one of the vibrational degrees of freedom is converted into a translational degree of freedom. Energy of the activated complex is higher than the energy of reactant molecules.

In a chemical reaction two reactants takes part. The rate of reaction is directly proportional to the concentration of one of them and inversely proportional to the concentration of the other. The order of reaction is:

Sodium pyrophosphate is represented by which of the following formula?

Which of the following statements is incorrect?

Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is:

Which of the following molecules/ions does not contain unpaired electrons ?