EASY
JEE Main
IMPORTANT
Earn 100

an allotrope of carbon contains
(a) hexagons and pentagons.
(b) hexagons and pentagons.
(c) hexagons and pentagons.
(d) hexagons and pentagons.

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Important Questions on The p-Block Elements
MEDIUM
JEE Main
IMPORTANT
Which one of the following is an oxide?

HARD
JEE Main
IMPORTANT
The number of bonds and the oxidation state of phosphorus atom in pyrophosphoric acid , respectively are:

MEDIUM
JEE Main
IMPORTANT
The correct sequence of decreasing number of -bonds in the structure of and is:

EASY
JEE Main
IMPORTANT
on partial hydrolysis with water, produces a compound The same compound is formed when reacts with silica. The compound is:

EASY
JEE Main
IMPORTANT
The non-metal that does not exhibit positive oxidation state is:

MEDIUM
JEE Main
IMPORTANT
Match the items in Column with its main use listed in Column:
Column | Column | ||
Silica gel | Transistor | ||
Silicon | Ion-exchanger | ||
Silicone | Drying agent | ||
Silicate | Sealant |

MEDIUM
JEE Main
IMPORTANT
The gas evolved on heating and with concentrated , on hydrolysis gives a white gelatinous precipitate. The precipitate is:

MEDIUM
JEE Main
IMPORTANT
Arrange the following bonds according to their average bond energies in descending order:
