List of top Chemistry Questions asked in BITSAT

Among the following four structures I to IV, it is true that

For the dissociation reaction, \( \text{H}_2 \rightarrow \text{H} + \text{H} \), \( \Delta H = 162 \, \text{Kcal} \), heat of atomisation of H is

The enthalpy of combustion of 2 moles of benzene at 27°C differs from the value determined in bomb calorimeter by

If 1.0 mole of \( \text{I}_2 \) is introduced into a 1.0 litre flask at 1000 K, at equilibrium (\( K_c = 10^{-6} \)), which one is correct?

For the reaction \( \text{CO(g)} + \frac{1}{2} \text{O}_2 (g) \rightarrow \text{CO}_2 (g) \), \( K_c \) is

The ions \( \text{O}^{2-} \), \( \text{F}^- \), \( \text{Na}^+ \), \( \text{Mg}^{2+} \) and \( \text{Al}^{3+} \) are isoelectronic. Their ionic radii show:

When the first ionisation energies are plotted against atomic number, the peaks are occupied by

The screening effect of \( d \)-electrons is

Using MOT, which of the following pairs denote paramagnetic species?

The oxidation state of sulphur in \( \text{Na}_2 \text{S}_4 \text{O}_6 \) is

The number of enantiomers of the compound \( \text{CH}_3 \text{CHBr} \text{CHBrCOOH} \) is

The Bohr orbit radius for the hydrogen atom (\( n = 1 \)) is approximately 0.530 Å. The radius for the first excited state (\( n = 2 \)) orbit is (in Å)

When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution, the ratio of volumes of hydrogen evolved is:

Due to Frenkel defect, the density of ionic solids

A current of 2.0 A passed for 5 hours through a molten metal salt deposits 22.2 g of metal (At wt. = 177). The oxidation state of the metal in the salt is

The electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride are connected in series. The ratio of iron deposited at cathodes in the two cells when electricity is passed through the cells will be:

What will be the main product when acetylene reacts with hypochlorous acid?

Equal weights of NaCl and KCl are dissolved separately in equal volumes of solutions. Molarity of the two solutions will be:

Volume of 3%solution of sodium carbonate necessary to neutralise a litre of 0.1 N sulphuric acid is

Volume of 3%solution of sodium carbonate necessary to neutralise a litre of 0.1 N sulphuric acid is

The greenhouse effect is because of the

Strong reducing behaviour of \( \text{H}_3 \text{PO}_4 \) is due to

In an \( \text{S}_\text{N}2 \) substitution reaction of the type \( \text{R} - \text{Br} + \text{Cl}^- \xrightarrow{\text{DMF}} \text{R} - \text{Cl} + \text{Br}^- \), which one of the following has the highest relative rate?

Nucleophilic addition reaction will be most favoured in