JEE Main 2019 (Online) 9th April Evening Slot | p-Block Elements Question 171 | Chemistry

The correct statements among I to III regarding group 13 element oxides are,
(I) Boron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thalliumare basic.

(II) and (III) only

(I), (II) and (III)

(I) and (III) only

(I) and (II) only

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

The amorphous form of silica is :

kieselguhr

quartz

tridymite

cristobalite

JEE Main 2019 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

C₆₀ an allotrope of carbon contains :

12 hexagons and 20 pentagons.

20 hexagons and 12 pentagons.

16 hexagons and 16 pentagons

18 hexagons and 14 pentagons.

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

Diborane (B₂H₆) reacts with O₂ and H₂O independently, then products formed are :

B₂O₃ and HBO₂

B₂O₃ and H₃BO₃

HBO₂ and H₃BO₃

HBO₂ and HBO₃

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