Hydrogen practice · Medium

Water is oxidised to oxygen by

Which of the following statements is incorrect?

Temporary hardness can be removed by boiling because

Commercial 11.2 volume ${\mathrm{H}_2}{\mathrm{O}_2}$ solution has a molarity of

The decomposition of $\mathrm{H}_2 \mathrm{O}_2$ is accelerated by -

The strength of 10 volume of ${\mathrm{H}_2}{\mathrm{O}_2}$ solution is

The number of Hydrogen bonded water molecules associated with $CuS{O_4}.5{H_2}O$ is

The reaction between following pairs will produce hydrogen except

(A): Some metals like $Pt$ and $Pd$ can be used as storage materials for $\mathrm{H}_2$ gas

(R): $Pt$ and $Pd$ can absorb large volumes of $\mathrm{H}_2$ (gas)

Determine the total number of neutrons in three isotopes of Hydrogen

An inorganic compound gives off $\mathrm{O}_2$ when heated, turns an acidic solution of $\mathrm{KI}$ violet and reduces acidified $\mathrm{KMnO}_4$. The compound is

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

Which of the following is electron-deficient

Tailing of mercury is a laboratory test for:

Which of the following is not true?

Number of water molecules in washing soda and soda ash respectively are :

An inorganic compound liberates ${\mathrm{O}_2}$ when heated, turns an acid solution of KI brown and reduces acidified $\mathrm{KMn}{\mathrm{O}_4}$. The substance is:

Determine the total number of neutrons in three isotopes of Hydrogen

The gas produced by the passage of air over hot coke is

The label on a bottle of ${H}_2 {O}_2$ solution reads as ' 10 volume'. The concentration of ${H}_2 {O}_2$ in percentage by volume is

Zeolites are extensively used in:

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.

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

Assertion: The volume strength of a solution of hydrogen peroxide decreases with an increase in the hardness of the water.

Reason: The hardness of water is caused by the presence of ions of calcium and magnesium. These ions react with hydrogen peroxide and reduce its volume strength.

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.

The synonym for water gas when used in the production of methanol is

Which of the following equation depicts the oxidising nature of ${H_2}{O_2}$ ?

The product obtained in the given reaction is

${CaC}_2+{D}_2{O} \longrightarrow$

Radioactive elements emit $\alpha, \beta$ and $\gamma$ rays and are characterized by their half-lives. The radioactive isotope of hydrogen is

$\mathrm{H}_2 \mathrm{O}_2$ and heavy water was discovered by respectively:-