In Haber's process,hydrogen is obtained by reacting methane with steam in the presence of $NiO$ as a catalyst. This process is known as steam reforming. Why is it necessary to remove $CO$ when ammonia is obtained by Haber's process?

The number of hydrogen atom$(s)$ attached directly to the phosphorus atom in hypophosphorous acid $(H_3PO_2)$ is:

Given below are the two statements: one is labeled as Assertion $(A)$ and the other is labeled as Reason $(R)$.
Assertion $(A)$: There is a considerable increase in covalent radius from $N$ to $P$. However,from $As$ to $Bi$,only a small increase in covalent radius is observed.
Reason $(R)$: Covalent and ionic radii in a particular oxidation state increase down the group.
In the light of the above statements,choose the most appropriate answer from the options given below:

What is expected to happen when phosphine gas is mixed with chlorine gas?

The oxoacid of phosphorus which contains $4 \ P-O-H$ bonds, $2 \ P=O$ bonds, and one $P-O-P$ bond is

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