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Calculate the amount of energy required to convert $110\, mg$ of $'X'$ atom in gaseous state into $X^+$ ion .................... $\mathrm{kJ}$ (Atomic wt. for $X = 7\, g/mol$)

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An atom has $26$ electrons and its atomic weight is $56.$ The number of neutrons in the nucleus of the atom will be

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For $OF _2$ molecule consider the following:

$(A)$ Number of lone pairs on oxygen is 2 .

$(B)$ $FOF$ angle is less than $104.5^{\circ}$.

$(C)$ Oxidation state of $O$ is $-2$.

$(D)$ Molecule is bent ' $V$ ' shaped.

$(E)$ Molecular geometry is linear.

Correct options are:

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After understanding the assertion and reason, choose the correct option.
Assertion : In the bonding molecular orbital $(MO)$ of $H_2,$ electron density is increased between the nuclei.
Reason : The bonding $MO$ is ${\psi _A}\, + \,\,{\psi _{B,}}$ which shows destructive interference of the combining electron waves.

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The molar conductivities at infinite dilution of barium chloride, sulphuric arid and hydrochloric acid are $280,860$ and $426 \,Scm ^{2}$ $mol ^{-1}$ respectively. The molar conductivity at infinite dilution of barium sulphate is $...... \,S cm ^{2} mol ^{-1}($ Round off to the Nearest Integer).

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The first ionization energy for Li is $5.4 \,eV $ and electron affinity of $Cl$ is $3.61\,eV.$ The $\Delta H$ (in $kJ/mol$) for the reaction $Li(g) + Cl(g) \to L{i^ + } + C{l^ - }$ is (if resulting ions do not combine with each other) $(1\,eV = 1.6 \times {10^{ - 19}}\,J)$

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Ions which have the same electronic configuration are those of

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The enthalpy of neutralization of a strong acid by a strong base is $-57.32\ kJ/mol$ the enthalpy of formation of water is $-285.84\ kJ/mol$ . The enthalpy of formation of hydroxyl ion is......$kJ/mol$

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Which of the following pairs is not correctly matched

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STD 12 - 4. d and f- block elements — NEET STD 11 Science — Question

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