JEE Main 2020 (Online) 2nd September Morning Slot | Periodic Table & Periodicity Question 83 | Chemistry

The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol^–1, respectively. How many moles of HCl and H₂SO₄, respectively, will be needed to react completely with 1 mole of the metal hydroxide ?

1 and 2

1 and 0.5

1 and 1

2 and 0.5

JEE Main 2020 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

B has a smaller first ionization enthalpy than Be. Consider the following statements :

(I) It is easier to remove 2p electron than 2s electron

(II) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be.

(III) 2s electron has more penetration power than 2p electron.

(IV) atomic radius of B is more than Be (Atomic number B = 5, Be = 4)

The correct statements are :

(I), (III) and (IV)

(II), (III) and (IV)

(I), (II) and (IV)

(I), (II) and (III)

JEE Main 2020 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

The acidic, basic and amphoteric oxides, respectively, are :

Cl₂O, CaO, P₄O₁₀

N₂O₃, Li₂O, Al₂O₃

MgO, Cl₂O, Al₂O₃

Na₂O, SO₃, Al₂O₃