Hydrogen practice · Mixed difficulty

The best method to test whether a clear liquid is water, is to:

One of the electrolyte used for the manufacture of ${H_2}{O_2}$ by electrolytic method

Mole of permanganate ions required to react completely with one mole of ${H_2}{O_2}$ in acidic medium is

${\mathrm{H}_\mathrm{2}}{\mathrm{O}_\mathrm{2}}$ is used as

Heavy water freezes at:

In one of these compounds does hydrogen have an oxidation state of $- 1$

Hydrogen combines directly with

Para and ortho ${\mathrm{H}_2}$ differ in

Hydrogen was discovered by:

What is formed when calcium carbide react with heavy water?

Hydrogen can be obtained from water by

Which of the following is correct about heavy water?

Which is polymeric hydride

Which of the following is method of laboratory preparation of dihydrogen ?

The composition of Tritium is

Which of the following halogen has maximum affinity for Hydrogen?

The formula of calgon is

Water is oxidised to oxygen by

Water is said to be permanently hard when it contains

$LiAl{H_4}$ Is widely used a reducing agent. In this hydride $Al$ is present in:

Given

(A) $2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_2(\mathrm{~g}) \quad \Delta \mathrm{H}_1^\theta=-\mathrm{xkJ} \mathrm{mol}^{-1}$

(B) $\mathrm{C}$ (graphite $)+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g}) \quad \Delta \mathrm{H}_2^\theta=-\mathrm{ykmol}^{-1}$

The $\Delta \mathrm{H}^\theta$ for the reaction

$\mathrm{C}($ graphite $)+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}(\mathrm{g})$ is

If $1 \mathrm{~L}$ of hard water (contains $\mathrm{CaSO}_4$ ) requires $0.286 \mathrm{~g}$ of washing soda $\left(\mathrm{Na}_2 \mathrm{CO}_3 \cdot 10 \mathrm {H}_2 \mathrm{O}\right)$ for softening process. What is the hardness of water in ppm?

$200 \mathrm{~g}$ sample of hard water is passed through a cation exchanger in which ${H}^{+}$ions are exchanged by ${Ca}^{2+}$ ions. The water coming out of cation exchanger needed $75 \mathrm{~mL}$ of $0.1 \mathrm{~N~} {NaOH}$ for complete neutralisation. The hardness of water due to ${Ca}^{2+}$ ion is

Calgon used as water softener. Its formula is

Fluorine reacts with water to form:

10 volumes of ${\mathrm{H}_2}{\mathrm{O}_2}$ has a strength of approximately:

Temporary hardness is due to bicarbonates of ${Mg}^{2+}$ and ${Ca}^{2+}$. It is removed by addition of ${CaO}$ as follows ${Ca}\left({HCO}_3\right)_2+{CaO} \longrightarrow 2 {CaCO}_3+{H}_2 {O}$
Mass of ${CaO}$ required to precipitate $2 {~g} \,{CaCO}_3$ is:

The volume strength of $1\,M\,\,{H_2}{O_2}$ is (Molar mass of ${H_2}{O_2} = 34\,\,g\,\,mo{l^{ - 1}})$

If water is boiled for sometime it becomes free from:

When a substance $A$ reacts with water it produces a combustible gas $\mathrm{B}$ and a solution of substance $\mathrm{C}$ in water. When another substance $\mathrm{D}$ reacts with this solution of $\mathrm{C}$, it also produces the same gas $\mathrm{B}$ on warming but $\mathrm{D}$ can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are