List of top Chemistry Questions

The shape of $ Xe{{F}_{4}} $ molecule and hybridisation of xenon in it are

The radius of an electron orbit in a hydrogen atom is of the order of

The homologue of ethyne is

The heat of atomisation of $PH_3(g)$ and $ P_2H_4(g)$ are $ 954 kJ\, mol^{-1}$ and $1485\, kJ\, mol^{-1}$ respectively .The P-P bond energy in $kJ\, mol^{-1}$ is

Phenol is heated with $CHCl_{3}$ and alcoholic $KOH$ when salicylaldehyde is produced. This reaction is known as

$ {NO^+}$ ligand is

If $N_{0}$ represents Avogadro's number, the number of valence electrons in $4.2 \,g$ of nitride ion $\left( N ^{3-}\right)$ is

Which of the following is not oxidised by ozone?

Benzamide on reaction with $POCl_{3}$ gives

Match the following. The correct answer is

Which of the following reagents converts both acetaldehyde and acetone to alkanes?

When NO reacts with $FeSO _{4}$, a brown coloured complex is formed. In the complex, the coordination number of Fe is $+6$.

The value of van der Waals' constant ' $a$ ' for ammonia is larger than that of nitrogen gas. Molecular weight of ammonia is smaller than nitrogen gas.

For the reaction, $2 NO (g)+ O _{2}(g) \rightleftharpoons 2 NO _{2}(g),$ increase in pressure favours the formation of $NO _{2}$. The reaction is exothermic.

Which of the following is an example of chain silicates?

Which of the following metal is correctly matched with its ore?

Which of the following pairs represents linkage isomers ?

Which one of the following statements is correct?

Table sugar is

Ordinary glass is formed by mixing of

Which of the following compounds shows optical isomerism?

$NH_{3}$ gas is passed over heated copper oxide. It oxidises to

$ {CH2 = CH2 ->[HBr] X} {->[A KOH] Y} { ->[{Na_2CO_3}][{I_2}] Z}$ In the above reaction sequence, $ Z $ is

Lucas test is given fastly by

Two cells each of same emf e but of internal resistances $ r_1 $ and $ r_2 $ are connected in series through an external resistance R. If the potential difference between the ends of the first cell is zero, what will be the value of R in terms of $ r_1 $ and $ r_2 $ ?