JEE Main 2019 (Online) 10th January Evening Slot | Periodic Table & Periodicity Question 93 | Chemistry

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JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-1

The 71^st electron of an element X with an atomic number of 71 enters into the orbital;

JEE Main 2019 (Online) 10th January Morning Slot

MCQ (Single Correct Answer)

-1

The electronegativity of aluminium is similar to :

Beryllium

Carbon

Boron

Lithium

JEE Main 2019 (Online) 10th January Morning Slot

MCQ (Single Correct Answer)

-1

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :

increase in atomic radii and decrease in ionic radii

increase in both atomic and ionic radii

decrease in both atomic and ionic radii

decrease in atomic radii and increase in ionic radii

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

When the first electron gain enthalpy $$\left( {{\Delta _{eg}}H} \right)$$ of oxygen is $$-$$ 141 kJ/mol, its second electron gain enthalpy is :

a more negative value than the first

almost the same as that of the first

negative, but less negative than the first

a positive value

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