List of top Chemistry Questions

The number of atoms in body-centred and face-centred cubic unit cell respectively are
How much solid oxalic acid (molecular weight $126$) has to be weighed to prepare $100$ mL of exactly $0.1$ N oxalic acid solution in water?
Hybridisation of the negative carbons in (1) and (2) are:
Hybridisation of the negative carbons
$1$ mL of water has $25$ drops. Let $N_A$ be the Avogadro number. What is the number of molecules present in $1$ drop of water? (Density of water = $1$ g/mL)
A sample of MgCO3 is dissolved in dilute HCl and the solution is neutralized with ammonia and buffered with NH4Cl / NH4OH. Disodium hydrogen phosphate reagent is added to the resulting solution. A white precipitate is formed. What is the formula of the precipitate?
The correct bond order of B-F bond in BF3 molecule is:
The boiling point of water is higher than liquid HF. The reason is that:
In Bohr's model of the atom, the radius of a hydrogen atom in the ground state is $r_1$ and the radius of a He+ ion in the ground state is $r_2$. Which of the following is correct?
Which of the following is radioactive?
$C_6H_6(\text{liquid}) + \frac{15}{2} O_2(\text{gas}) \rightarrow 6 CO_2(\text{gas}) + 3 H_2O(\text{liquid})$ Benzene burns in oxygen according to the above equation. What is the volume of oxygen (at STP) needed for complete combustion of $39$ grams of liquid benzene?
A metal ($M$) forms two oxides. The ratio $M:O$ (by weight) in the two oxides are $25:4$ and $25:6$. The minimum value of atomic mass of $M$ is
How many monobrominated product(s) (including stereoisomers) would form in the free radical bromination of n-butane?
What is the correct order of acidity of salicylic acid, 4-hydroxybenzoic acid, and 2,6-dihydroxybenzoic acid?
The enol form in which ethyl-3-oxobutanoate exists is
The correct order of relative stability of the given conformers of n-butane is
order of relative stability
The major product of the following reaction is $F_3C \rightarrow CH = CH_2 + HBr$
The correct order of relative stability for the given free radical is:
The product of the following hydrogenation reaction is:
The product of the following reaction is:
Which of the following would produce enantiomeric products when reacted with methyl magnesium iodide?
The correct order of acidity of the following hydra acids is:
The correct statement(s) about B2H6 is/are:
The average speed of $H_2$ at $T_1$ K is equal to that of $O_2$ at $T_2$ K. The ratio $T_1:T_2$ is
Let (Cms)H2 be the r.m.s speed of H2 at 150 K. At what temperature, the most probable speed of helium [(Cmp)He] will be half of (Crms)H2?
Which of the following is the correct set of four quantum numbers ($n$, $l$, $m$, $s$)?