Hydrogen Test -...

The correct statements among (a) to (d) are:
(a) saline hydrides produce $$H_{2}$$ gas when reacted with $$H_{2}O$$.
(b) Reaction of $$LiAlH_{4}$$ with $$BF_{3}$$ leads to $$B_{2}H_{6}$$.
(c) $$PH_{3}$$ and $$CH_{4}$$ are electron - rich and electron - precise hydrides, respectively.
(d) $$HF$$ and $$CH_{4}$$ are called as molecular hydrides.

Very pure hydrogen $$(99.9\%)$$ can be made by which of the following processes?

The hydride that is not electron deficent is:

Hydrogen peroxide oxidises $$[Fe(CN)_6]^{4-}$$ to $$[Fe(CN)_6]^{3-}$$ in acidic medium but reduce $$[Fe(CN)_6]^{3-}$$ to $$[Fe(CN)_6]^{4-}$$ in alkaline medium. The other products formed are, respectively:

In context with the industrial preparation of hydrogen from water gas $$(CO +\mathrm{H}_{2})$$, which of the following is the correct statement?

Which of the following combination will produce $$H_{2}$$ gas?

Assertion: The $$O-O$$ bond length in $$H_2O_2$$ is shorter than that of $$O_2F_2$$.
Reason: $$H_2O_2$$ is an ionic compound.

Which of the following process is not used in the concentration of $$H_{2}O_{2}$$?

As oxygen is ______ soluble in water. Air dissolved in water contains a higher percentage of oxygen (30-35%) than ordinary air (21%).

Which of the following gas is lightest?