Hydrogen practice · Medium

A sample of hard water has hardness expressed as $80 \mathrm{ppm}$ $\mathrm{Ca}^{2+}$. This sample is passed through a cation exchange resin column. Thus, $\mathrm{pH}$ of water coming out of exchange resin is

$\mathrm{Be}(\mathrm{OH})_{2}$ reacts with $\mathrm{Sr}(\mathrm{OH})_{2}$ to yield an ionic salt. Choose the incorrect option related to this reaction from the following

The correct statements among (1) to (4) are:
1. Saline hydrides produce ${H_2}$ gas when reacted with ${H_2}O$
2) Reaction of $LiAl{H_4}$ with $B{F_3}$ leads to ${B_2}{H_6}$
3) $P{H_3}$ and $C{H_4}$ are electron rich and electron precise hydrides, respectively
4) $HF\mathrm{ }$ and $C{H_4}$are called as molecular hydrides

The bond energy of covalent O—H bond in water is:

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

Hydrogen combines directly with

Hydrogen can be obtained from water by

Which is polymeric hydride

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

The formula of calgon is

Water is oxidised to oxygen by

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

$200 \mathrm{~g}$ 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

Fluorine reacts with water to form:

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

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

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

Which cannot be oxidised by ${\mathrm{H}_2}{\mathrm{O}_2}$?

Assertion (A) : On passing $\mathrm{H}_2$ gas into aqueous $\mathrm{Fe}^{3+}$ solution, resulting solution gives test of $\mathrm{Fe}^{3+}$.

Reason (R): $\mathrm{H}_2(g)$ reduces $\mathrm{Fe}^{3+}$ to $\mathrm{Fe}^{2+}$ but $\mathrm{Fe}^{2+}$ is oxidised to $\mathrm{Fe}^{3+}$ by atmospheric oxygen.

Hydrogen is evolved by the action of cold dilute $\mathrm{HN}{\mathrm{O}_3}$ on:

Zeolites are extensively used in:

The pair that yields the same gaseous product on reaction with water:

Exhausted cation exchange resin is regenerated by using solution of

$1000 \mathrm{~g}$ aqueous solution of ${CaCO}_3$ contains $18 \, \mathrm{mg}$ of ${CaCO}_3$ of the solution is

Hydrogen is formed according to the equation $2 \mathrm{Na}+2 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{NaOH}+\mathrm{H}_2$. How many grams of sodium are required to produce $7.81 \mathrm{~g}$ of $\mathrm{H}_2$?

Electrolysis of $X$ gives $Y$ at anode. Vacuum distillation of $Y$ gives ${\mathrm{H}_2}{\mathrm{O}_2}$. The number of peroxy (O - O) bonds present in $X$ and $Y$ respectively are

Following are some properties of hydrogen. Which of the following properties resemble with alkali metals and which with halogens

(i) Hydrogen lose one electron to form unipositive ions

(ii) Hydrogen gain one electron to form uninegative ions

(iii) Hydrogen forms oxides, halides and sulphides

(iv) Hydrogen has a very high ionization enthalpy

(v) Hydrogen forms a diatomic molecule, combines with elements to form hydrides and covalent compounds.

(A):I.E. ofH atom is comparable with halogen

(R): $\mathrm{H}$-atom is much larger in size than alkali metals

Identify the incorrect statement regarding ${D_2}O$