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Assertion. The first ionization enthalpy of aluminium is lower than that magnesium.

Monjur Alahi

Assertion. The first ionization enthalpy of aluminium is lower than that magnesium.

Reason. Ionic radius of aluminium is smaller than that of magnesium.

(a) If both assertion and reason are true, and reason is the true explanation of the assertion.

(b) If both assertion and reason are true, but the reason is not true explanation of the assertion.

(c) If assertion is true, but reason is false.

(d) If both assertion and reason are false.


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2 Answers

Salim Ahmed Kawsar

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(b) Correct explanation: in Al, 3p electron is to be removed while in Mg, a 3s electron is to be removed .

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Salim Ahmed Kawsar

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(c)Correct explanation: Additional electron is repelled more effectively by 2p electrons in F than 3p electrons in Cl.

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Assertion : N2 is less reactive than P4. Reason : Nitrogen has more electron gain enthalpy than phosphorus

(c) Assertion is correct, reason is incorrect 

1 Answers 1 views
Among the elements of the 3rd period from Na to Ar, pick out the element: (a). with highest first ionization enthalpy

(a). Ar has highest first ionization enthalpy.

1 Answers 1 views
How would you explain the fact that the first ionization of Na is lower than that of Mg but its second ionization enthalpy is higher than that of Mg?

The electronic configurations of Na and Mg are: Na:1s2 2s2 2p6 3s1 And Mg: 1s2 2s2 2p6 3s2 thus, the first electron in both the cases has to be removed...

1 Answers 1 views
Give reason (a) C and Si are always tetravalent but Ge, Sn, and Pb show divalency. (b) Gallium has higher ionization enthalpy than Al.Explain.

(a) Ge, Sn and Pb show divalency due to inert pair effect, Pb2+is more stable than Pb4+.  (b) Due to poor shielding effect of d-electrons in Ga, effective nuclear charge increases...

1 Answers 1 views
ASSERTION (A): Generally, ionization enthalpy increases from left to right in a period.

(b) Reason is correct explanation for assertion.

1 Answers 7 views
ASSERTION (A): Boron has a smaller first ionization enthalpy then beryllium.

(c)Reason is correct explanation for assertion

1 Answers 1 views
Statement 1: Of all the elements, helium has the highest value of first ionization enthalpy.

(c) Correct Statement :Helium is the smallest inert gas.

1 Answers 1 views
Assertion. The first ionization enthalpy of aluminium is lower than that magnesium. 1 Answers 1 views
Assertion. The first ionization energy of Be is greater than that of B.

(c)Correct explanation: 2p orbital has higher energy than 2s orbital .

1 Answers 1 views
Assertion. First ionization energy for nitrogen is lower than that of oxygen.

(d)Correct explanation: Nitrogen has stable exactly half filled electronic configuration but oxygen does not have.

1 Answers 1 views

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