List of top Chemistry Questions

The paramagnetic nature of oxygen molecular is best explained on the basis of

The IUPAC name of   is :

Which of the following is the most basic oxide ?

Which of the following is not a correct statement ?

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is :

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.