(A) Selenium exists in two allotropic forms: red (non-metallic) and grey (metallic).

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Class 12 Chemistry p-Block Elements (Class 12)Oxygen family

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What is the number of allotropes of selenium?

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A
$2$
B
$4$
C
$5$
D
$6$

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$V_2O_5$ is useful as a catalyst in:

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The molecular formula of pyrosulfuric acid is

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Assertion: $Ozone$ is a powerful oxidising agent in comparison to $O_2$.
Reason: $Ozone$ is diamagnetic but $O_2$ is paramagnetic.

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Which of the following has $S-S$ bond?

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The colour of liquid $O_2$ is

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What is the number of allotropes of selenium?

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$V_2O_5$ is useful as a catalyst in:

The molecular formula of pyrosulfuric acid is

Assertion: $Ozone$ is a powerful oxidising agent in comparison to $O_2$.Reason: $Ozone$ is diamagnetic but $O_2$ is paramagnetic.

Which of the following has $S-S$ bond?

The colour of liquid $O_2$ is

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Assertion: $Ozone$ is a powerful oxidising agent in comparison to $O_2$.
Reason: $Ozone$ is diamagnetic but $O_2$ is paramagnetic.