List of top Chemistry Questions

One mole of magnesium nitride on the reaction with excess of water gives

Number of lone pair(s') in $XeOF_4$ is/are

Calculate $\Delta G^{o}$ for conversion of oxygen? To ozone $3 / 2 O _{2}(g) \rightarrow O _{3}(g)$ at $298 \,K$, if $K_{p}$ for this conversion is $2.47 \times 10^{-29}$ :

The structural formula of indigo dye is :

Lattice energy is calculated by :

Which of the following is correct?

The enthalpy change for the reaction of $50.00\, mL$ of ethylene with $50.00\, mL$ of $H_2 $ at $1.5\, atm$ pressure is $\Delta H=-0.31\, kJ$. The value of $\Delta E$ will be:

In a cell that utilises the reaction $ {Zn(s) + 2H+ (aq) -> Zn2+(aq) + H2(g)}$ addition of $H_2SO_4$ to cathode compartment, will

Identify the correct statements regarding enzymes

How much energy is released when 6 moles of octane is burnt in air ? Given $\Delta H_{f}{ }^{\circ}$ for $CO _{2}(g), H _{2} O (g)$ and $C _{8} H _{18}(l)$ respectively are $-490,-240$ and $+160\, J / mol :$

How many $\sigma$ and $\pi$-bonds are in $SO _{4}^{2-}$ ?

$H_2S_2O_7$ has a commercial name as

Excess of KI reacts with $CuSO_4$ solution and then $Na_2S_2O_3$ solution is added to it. Which of the statements is incorrect for this reaction?

Codon is present in

Which of the following reacts with both acetaldehyde and acetone?

Bradys reagent is:

In which of the following reactions, ethyl chloride is obtained in good yield?

Which of the following yield $2$ mole of formaldehyde on ozonolysis?

What will be obtained when acetylene is treated with arsenic chloride?

Phenol on treatment with formaldehyde in dilute alkaline solution, gives:

$ C-O $ bond in ether can be broken by:

The $pK_a$ of acetic acid is lower than that of phenol. Phenoxide ion is more resonance stabilised.

$HClO_4$ is a stronger acid than $HClO_3$. Oxidation state of chlorine in $HClO_4$ is $+7$ and in $HClO_3$ is $+5$.

Aqueous gold colloidal solution is red in colour. The colour arises due to scattering of light by colloidal gold particles.

All $F - S - F$ angle in $SF_4$ is greater than $90^{\circ}$ but less than $180^{\circ}$. The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.