List of top Chemistry Questions

The shape of molecule with 4 bond pairs and zero lone pair is 4

'Sigma bond' is formed by

Element 'A' forms tripositive ion and element 'B' forms dinegative ion. The chemical formula of the compound formed with A and B will be

The orbital with highest penetration power is

According to Linus Pauling, the electronegativity values are based on

Relative lowering of vapour pressure of a dilute solution of glucose dissolved in 1 kg of water is 0.002. The molality of the solution is

Addition of excess of AgNO3 to an aqueous solution of 1 mole of PdCl2. 4NH3 gives 2 moles of AgCl. The conductivity of this solution corresponds to

$50\, mL$ of $0.02\, M \,NaOH$ solution is mixed $50\, mL$ of $0.06 \,M$ acetic acid solution, the $pH$ of resulting solution is $\left( p K_{a}\right.$ of acetic acid is $4.76, \log 5=0.70$ )

The number of species of the following that can act both as Bronsted acids and bases is $HCl , ClO _{4}^{-},{ }^{-} OH , H ^{+}, H _{2} O , HSO _{4}^{-}, SO _{4}^{2-}$, $H _{2} SO _{4}, Cl ^{-}$

What is the value of γ for a monoatomic gas (ideal gas):

In the reaction $2 PCl _{5} \rightleftharpoons PCl _{4}^{+}+ PCl _{6}^{-}$, the change in hybridisation is from

General formula of solid in zinc blende structure is:

In the purification of impure nickel by Mond's process, metal is purified by:

In Dumas method one gram of carbon compound gives $50 \,mL$ of $N _{2}$ at $300\, K$ and $740 \,mm\, Hg$ pressure. If the aqueous tension at $300\, K$ is $15\, mm\, Hg$, what is the percentage of nitrogen in it?

Write the IUPAC name of the following

In water saturated air, the mole fraction of water vapour is $0.02$. If the total pressure of the saturated air is $1.2\, atm$, the partial pressure of dry air is :

The molecule/ion having diamagnetic nature and a bond order of $1.0$ is

1 g of non-volatile non-electrolyte solute is dissolved in 100g of two different solvents A and B whose ebullioscopic constants are in the ratio of 1 : 5. The ratio of the elevation in their boiling points, $\frac{\Delta T_b(A)}{\Delta T_b (B)}$, is:

Which of the following compounds is not aromatic ?

In the following skew conformation of ethane, $H'-C-C-H''$ dihedral angle is :

An aromatic compound $'A'$ having molecular formula ${C7H6O2}$ on treating with aqueous ammonia and heating forms compound $'B'$. The compound $'B'$ on reaction with molecular bromine and potassium hydroxide provides compound $'C'$ having molecular formula ${C_6H_7N}$. The structure of $'A'$ is :

Arrange the following amines in the decreasing order of basicity:

Which among the following cannot react with nitrous acid?

Each unit of DNA has