List of top Chemistry Questions asked in BITSAT

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

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?

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M \( \text{HNO}_3 \)? The concentrated acid is 70% \( \text{HNO}_3 \).

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)

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

Figure shows a copper rod joined to a steel rod. The rods have equal length and equal crosssectional area. The free end of the copper rod is kept at $0^{\circ} C$ and that of steel rod is kept at $100^{\circ} C$. Find the temperature of the junction of the rod. Conductivity of copper $=390 W / m ^{\circ} C$. Conductivity of steel $=46 W / m ^{\circ} C$

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:

The enthalpy of combustion of $2$ moles of benzene at $27^{\circ} C$ differs from the value determined in bomb calorimeter by

The oxidation state of sulphur in $Na_2S_4O_6$ is

For the dissociation reaction, $H _{2}( g ) \rightarrow 2 H ( g ) \quad \Delta H =162 Kcal$, heat of atomisation of $H$ is

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following order?

Which of the following is less acidic among the given halogen compounds?

The number of enantiomers of the compound $CH _{3} CHBrCHBrCOOH$ is

Strong reducing behaviour of $H_3PO_2$ is due to

Which of the following is not the product of dehydration of

How many grams of concentrated nitric acid solution should be used to prepare $250\, mL$ of $2 \cdot 0\, M HNO _{3}$ ? The concentrated acid is $70 \% HNO _{3}$.

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

The preparation of ethyl acetoacetate involves:

In the reaction $3 Br _{2}+6 CO _{3}^{2-}+3 H _{2} O \longrightarrow 5 Br ^{-}+ BrO _{3}^{-}+6 HCO _{3}^{-}$