If first ionization enthalpies of element X and Y are 419 kJ mol -1 and 590 kJ mol -1, respectively and second ionization enthalpies of X and Y are 3069 kJ mol -1 and 1145 kJ mol -1, respectively. Then correct statement is :-

Question

If first ionization enthalpies of element X and Y are 419 kJ mol -1 and 590 kJ mol -1, respectively and second ionization enthalpies of X and Y are 3069 kJ mol -1 and 1145 kJ mol -1, respectively. Then correct statement is :- (A) X is an alkali metal and Y is an alkaline earth metal. (B) X is an alkaline earth metal and Y is an alkali metal. (C) Both X and Y are alkali metals. (D) Both X and Y are alkaline earth metals.

Tardigrade Admin · Accepted Answer

2 text nd I.E. of alkali metals much higher than that of alkaline earth metal, due to noble gas configuration.

Q. If first ionization enthalpies of element $X$ and $Y$ are $419 k J m o l^{- 1}$ and $590 k J m o l^{- 1}$ , respectively and second ionization enthalpies of $X$ and $Y$ are $3069 k J m o l^{- 1}$ and $1145 k J m o l^{- 1}$ , respectively. Then correct statement is :-

$X$ is an alkali metal and $Y$ is an alkaline earth metal.

$X$ is an alkaline earth metal and $Y$ is an alkali metal.

Both $X$ and $Y$ are alkali metals.

Both $X$ and $Y$ are alkaline earth metals.

$2^{nd}$ I.E. of alkali metals much higher than that of alkaline earth metal, due to noble gas configuration.

Q. If first ionization enthalpies of element X and Y are 419kJmol−1 and 590kJmol−1, respectively and second ionization enthalpies of X and Y are 3069kJmol−1 and 1145kJmol−1, respectively. Then correct statement is :-

X is an alkali metal and Y is an alkaline earth metal.

X is an alkaline earth metal and Y is an alkali metal.

Both X and Y are alkali metals.

Both X and Y are alkaline earth metals.