Identify the reaction/process in which the entropy increases.

On increasing temperature, the equilibrium constant of exothermic and endothermic reactions, respectively

Which of the following statements is correct about "shielding effect"?
1. It is effective, when the orbitals in the inner shells are completely filled.
2. Inner shells do not show any effect.
3. With increase of shielding down the group, ionisation energy increases.
4. With increasing nuclear charge, the shielding effect increases.

Calculate the energy required to convert all atoms in \(4.8 \mathrm{~g}\) of \(\mathrm{Mg}\) to \(\mathrm{Mg}^{2+}\) in the vapour state. \(\mathrm{IE}_1\) and \(\mathrm{IE}_2\) of \(\mathrm{Mg}\) are \(740 \mathrm{~kJ} / \mathrm{mol}\) and \(1450 \mathrm{~kJ} / \mathrm{mol}\) respectively.

If the most probable speed of \(\mathrm{CO}_2\) at \(27^{\circ} \mathrm{C}\) is \(400 \mathrm{~ms}^{-1}\). The root mean square velocity of \(\mathrm{CO}_2\) at the same temperature in \(\mathrm{ms}^{-1}\) is approximately

In the preparation of baking soda, ${\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{CO}}_2$ in ratio is used to react with ${\mathrm{Na}}_2{\mathrm{CO}}_3$.

Which element of the \(3 d\)-series has highest third ionisation enthalpy?

Names of units of some physical quantities are given in List-I and their dimensions formulae are given in List-Il. Match the correct pairs in the lists
\(\begin{array}{ll|ll}
\hline & \text{ List-I } & \text{ List-II } \\
\hline A. & \mathrm{Pa}-\mathrm{s} & (i) & {\left[\mathrm{L}^2 \mathrm{~T}^{-2} \mathrm{~K}^{-1}\right]} \\
\hline B. & \mathrm{NmK}^{-1} & (ii) & {\left[\mathrm{MLT}^{-3} \mathrm{~K}^{-1}\right]} \\
\hline C. & \mathrm{J} \mathrm{kg}^{-1} \mathrm{~K}^{-1} & (iii) & {\left[\mathrm{ML}^{-1} \mathrm{~T}^{-1}\right]} \\
\hline D. & \mathrm{Wm}^{-1} \mathrm{~K}^{-1} & (iv) & {\left[\mathrm{ML}^2 \mathrm{~T}^{-2} \mathrm{~K}^{-1}\right]} \\
\hline
\end{array}\)
\(\begin{array}{llll}A & B & C & D\end{array}\)

A horizontal board is performing simple harmonic oscillations horizontally with an amplitude 0.3 m and a period of 4 s . The minimum coefficient of friction between a heavy body placed on the board if the body is not to slip is.

${\mathrm{H}}_3{\mathrm{BO}}_3$ or $\mathrm{B}(\mathrm{OH}{)}_3$ is considered as an acid because its molecule

\(\mathrm{A}(2,1,2), \mathrm{B}(1,0,0), C(1+\sqrt{3}, \sqrt{3},-\sqrt{6})\) are vertices of a triangle. If the length of the median drawn through \(\mathrm{A}\) is \(\lambda \sqrt{9-2 \sqrt{3}+2 \sqrt{6}}\) then \(\lambda=\)

Curdling of milk is caused due to the formation of which of the following acids by the bacteria?

The maximum distance between the transmitting and receiving antennas for satisfactory communication in line of sight mode is 57.6 km . If the height of the receiving antenna is 80 m , the height of the transmitting antenna is (Radius of earth \(=6.4 \times 10^6 \mathrm{~m}\) )