Assertion :Best diagonal relationship is shown between Be and Al. Reason: Ionization energy of Be is almost the same as that of Al.

Both Assertion and Reason are correct and Reason is the correct explanation ofAssertion

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Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation ofAssertion
On moving diagonally in the modern periodic table the elements show certain similarities. This is due to the fact that on moving across a period from left to right electropositivity of the atom decreases. On the other hand on moving down the group electropositivity increases.

These two factors work in opposite direction. Hence the elements that are present diagonally to each other have similar properties. Diagonal relationship is more noticeable in the second and third period of the modern periodic table.

As a result of diagonal relationship, the physical properties such as the atomic size, electronegativity, density etc. and chemical properties of compounds such as reaction with water, nitrogen, decomposition reactions etc. are similar.

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Similar questions

Assertion: Be and Al have similar properties.

Reason: $B e^{2 +}$ and $A l^{3 +}$ have nearly the same charge/volume ratios and similar polarising power.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.
Reason: Equation of the x-axis is y = 0

Choose the correct option.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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