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JEE Mains | PYQ

The correct order of electron gain enthalpies of \( \mathrm{Cl} \), \( \mathrm{F} \), \( \mathrm{Te} \) and \( \mathrm{Po} \) is

The first ionization enthalpy of \( \mathrm{Na} \), \( \mathrm{Mg} \) an \( \mathrm{Si} \), respectively, are: \( 496 \) and \( 737 \) and \( 786 \) \( \mathrm{kJ \, mol^{-1}} \). The first ionization enthalpy (\( \mathrm{kJ \, mol^{-1}} \)) of \( \mathrm{Al} \) is:

The correct decreasing order of metallic character is:

The incorrect statement is:

The electronic configuration of Pt (atomic number \( 78 \)) is:

The metal that has very low melting point and its periodic position is closer to a metalloid is:

The first ionization enthalpies of \( \mathrm{Be} \), \( \mathrm{B} \), \( \mathrm{N} \) and \( \mathrm{O} \) follow the order.

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The first ionization enthalpy for oxygen is lower than that of nitrogen.
Reason R: The four electrons in \( 2p \) orbitals of oxygen experience more electron-electron repulsion.
In the light of the above statements, choose the correct answer from the options given below:

Given below are the oxides:
\( \mathrm{Na}_{2}\mathrm{O}, \ \mathrm{As}_{2}\mathrm{O}_{3}, \ \mathrm{N}_{2}\mathrm{O}, \ \mathrm{NO} \) and \( \mathrm{Cl}_{2}\mathrm{O}_{7} \)
Number of amphoteric oxides is: