Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements?
a. Nitrogen
b. Phosphorous
c. Chlorine
d. Fluorine

In which of the following reactions, benzaldehyde is formed from benzoyl chloride and hydrogen in the presence of \(\mathrm{Pd}-\mathrm{BaSO}_4 ?\)

For the cell reaction, \(3 \mathrm{Sn}^{4+}+2 \mathrm{Cr} \longrightarrow 3 \mathrm{Sn}^{2+}+2 \mathrm{Cr}^{3+}, E_{\text {cell }}^{\circ}\) is \(0.89 \mathrm{~V}\). Then \(\Delta G^{\circ}\) for the reaction is

The pair of xenon compounds, which have a same number of lone pairs of electrons on the central atom is

Which among the following compound shows the highest lattice energy?

If the uncertainty in velocity of electron \((\Delta \mathrm{v})\) is \(0.1 \mathrm{~m} / \mathrm{s}\), the uncertainty in its position \((\Delta x)\) is
(given: \(m_e=9.1 \times 10^{-31} \mathrm{~kg}\) )

Which of the following sequence of reagents convert propene to 1-chloropropane?

A mixture of ethyl iodide and n-propyl iodide is subjected to Wurtz reaction. The hydrocarbon which will not be formed is

How much current is required to produce \(\mathrm{H}_2\) gas at the rate of \(1 \mathrm{cc} / \mathrm{sec}\) under STP?

Match the following
\(\begin{array}{ll}
\text{List - I} & \text{List - II} \\
\text{A) } \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_4\right] & \text{I) Roasting} \\
\text{B) } \mathrm{Ni}(\mathrm{CO})_4 \xrightarrow{230^{\circ} \mathrm{C}} \mathrm{Ni}+4 \mathrm{CO} & \text{II) Calcination} \\
\text{C) } \mathrm{Fe}_2 \mathrm{O}_3 \cdot 3 \mathrm{H}_2 \mathrm{O} \xrightarrow{\Delta} \mathrm{Fe}_2 \mathrm{O}_3+3 \mathrm{H}_2 \mathrm{O} & \text{II) Vapour phase refining} \\
\text{D) } 2 \mathrm{PbS}+3 \mathrm{O}_2 \rightarrow 2 \mathrm{PbO}+2 \mathrm{SO}_2 & \text{IV) Electrolysis} \\
& \text{V) Leaching}
\end{array}\)
The correct answer is

Suppose \(E\) and \(F\) are two events of a random experiment. If the probability of occurrence of \(E\) is \(1 / 5\) and the probability of occurrence of \(F\) given \(E\) is \(1 / 10\), then the probability of non-occurrence of atleast one of the events \(E\) and \(F\) is

A bullet of mass $10 g$ pierces through a plate $A$ of mass $500 \mathrm{g}$ and then gets embedded into a second plate $B$ of mass $1.49 \mathrm{kg}$ as shown in the figure. Initially the two plates $A$ and $B$ are at rest and move with same velocity after collision. The percentage loss in the initial kinetic energy of the bullet when it is between the plates $A$ and $B$ is_______. (Neglect any loss of material of the plates during the collision)

Assuming \(x\) to be so small that \(x^2\) and higher powers of \(x\) can be neglected, the coefficient of \(x\) in \(\frac{(1-x)^{1 / 3}+(1-5 x)^2}{(16-x)^{1 / 4}}\) is equal to