List of top Chemistry Questions

'x' grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of 'x' in grams ?

x g of Ag was dissolved in $HNO_3$ and the solution was treated with excess of NaCl when 2.87 g of AgCl was precipitated. The value of x is

With increase of temperature, which of these changes ?

Which of the postulates of Dalton's atomic theory is incorrect:

Which of the following samples contains the smallest number of atoms ?

Which of the following is the most accurate measurement?

Which of the following has the highest mass ?

$74.5\, g$ of a metallic chloride contain $35.5\, g$ of chlorine. The equivalent weight of the metal is

The least count of an instrument is $0.01\, cm$: Taking all precautions, the most possible error in the measurement can be:

The equivalent weight of a solid element is found to be $9$. If the specific heat of this element is $ 1.05\,J{{g}^{-1}}{{K}^{-1}}, $ then its atomic weight is:

Most electropositive metals are obtained from their ores by

Pure hydrogen is obtained by carrying electrolys is of

The hydrogen electrode is dipped in a solution of pH = 3 at 25$^\circ$C. The potential of the cell would be (the value of 2.303 RT/F is 0.059 V)

The molecule which has highest bond order is

Oxygen molecule is paramagnetic in nature. What is the paramagnetic content in terms of magnetic moment in $O^{-}_{2}$?

The conditions for the combination of atomic orbitals to form molecular orbitals are stated below. Mark the incorrect condition mentioned here.

The electronic configuration of carbon is $1s^2 2s^2 2p^2$. There are $12$ electrons in $C_2$. The correct electronic configuration of $C_2$ molecule is

The increasing order of energies of various molecular orbitals of $N_2$ is given below: $\sigma 1s < \sigma^* 1s

Which contain at least one e- in $\sigma 2p$ bonding MO

$SF_6$ exists but $OF_6$ does not because

$ C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH $ and $ {{H}_{3}}CC{{H}_{2}}OC{{H}_{3}} $ are:

Number of stereoisomers of lactic add is

$0.92 \,g$ of an organic compound was analysed by combustion method. The mass of the $U$-tube increased by $1.08 \,g$. What is the percentage of hydrogen in the compound?

Consider the following carbocations : I. $Cl_3 \overset{+}C$ II. $Cl_{2} \overset{+} {C}H$ III. $Cl \overset{+} {C}H_{2}$ IV. $ \overset{+} {C}H_{3}$ The stability sequence follows the order

$1$-Butene and cyclobutane show