Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A :$ Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason $R :$ It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy,when one moves from left to right in a period.
In the light of the above statements,choose the most appropriate answer from the options given below :
Assertion $A :$ Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason $R :$ It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy,when one moves from left to right in a period.
In the light of the above statements,choose the most appropriate answer from the options given below :
- A$A$ is false but $R$ is true.
- B$A$ is true but $R$ is false.
- CBoth $A$ and $R$ are correct and $R$ is the correct explanation of $A$.
- DBoth $A$ and $R$ are correct but $R$ is not the correct explanation of $A$.
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Similar Questions
The first $\left( \Delta_{i}H_{1} \right)$ and the second $\left( \Delta_{i}H_{2} \right)$ ionization enthalpies (in $kJ \ mol^{-1}$) and the $\left( \Delta_{eg}H \right)$ electron gain enthalpy (in $kJ \ mol^{-1}$) of a few elements are given below:
Elements $\left( \Delta_{i}H_{1} \right)$ $\left( \Delta_{i}H_{2} \right)$ $\left( \Delta_{eg}H \right)$ $I$ $520$ $7300$ $-60$ $II$ $419$ $3051$ $-48$ $III$ $1681$ $3374$ $-328$ $IV$ $1008$ $1846$ $-295$ $V$ $2372$ $8581$ $+48$ $VI$ $738$ $1451$ $-40$
Which of the above elements is likely to be:
$(a)$ the least reactive element.
$(b)$ the most reactive metal.
$(c)$ the most reactive non-metal.
$(d)$ the least reactive non-metal.
$(e)$ the metal which can form a stable binary halide of the formula $MX_{2}$ ($X =$ halogen).
$(f)$ the metal which can form a predominantly stable covalent halide of the formula $MX$ ($X =$ halogen)?
| Elements | $\left( \Delta_{i}H_{1} \right)$ | $\left( \Delta_{i}H_{2} \right)$ | $\left( \Delta_{eg}H \right)$ |
|---|---|---|---|
| $I$ | $520$ | $7300$ | $-60$ |
| $II$ | $419$ | $3051$ | $-48$ |
| $III$ | $1681$ | $3374$ | $-328$ |
| $IV$ | $1008$ | $1846$ | $-295$ |
| $V$ | $2372$ | $8581$ | $+48$ |
| $VI$ | $738$ | $1451$ | $-40$ |
Which of the above elements is likely to be:
$(a)$ the least reactive element.
$(b)$ the most reactive metal.
$(c)$ the most reactive non-metal.
$(d)$ the least reactive non-metal.
$(e)$ the metal which can form a stable binary halide of the formula $MX_{2}$ ($X =$ halogen).
$(f)$ the metal which can form a predominantly stable covalent halide of the formula $MX$ ($X =$ halogen)?
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