Preparation of Hydrogen

Q.

Give the equation for the preparation of producer gas and water gas.

Q. Hydrogen cannot be obtained by:

1. $Zn+dil.H_{2}S{O}_4$
2. $Zn+dil.HN{O}_3$
3. $Mg+H_{2}O\left(g\right)$
4. $Mg+dil.H_{2}S{O}_4$

Q. 59. an amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50atm pressure ammonium hydrogen sulphide decomposes to yeild NH3 and H2S gases in the flask . when the decomposition reaction reaches equilibrium the total pressure in the flask rises to 0.84atm . the equilibrium constant for NH4HS decomposition at this temperature is ?

Q. Which of the following combination will produce $H_2$ gas?

1. $Fe$ metal and conc. $HN{O}_3$
2. $Cu$ metal and conc. $HN{O}_3$
3. $Zn$ metal and $NaOH$(aq.)
4. $Au$ metal and $NaCN$ (aq.) in the presence of air

Q. Choose the correct statement about the industrial preparation of hydrogen from water gas $(CO+H_2)$.

1. $H_2$ is removed through occlussion with Pd
2. CO and $H_2$ are fractionally separated using differences in their densities
3. CO is removed by absorption in aq. $C{u}_{2}C{l}_2$ solution.
4. CO is oxidised to $C{O}_2$ with steam in the presence of a catalyst followed by absorption of $C{O}_2$ in alkali

Q. Which one of the following process uses water gas shift reaction?

1. Merck's process
2. Lane's process
3. Permutit's process
4. Bosch's process

Q. Syngas contains

1. only CO
2. only $H_2$
3. both CO and $H_2$
4. All the above

Q. 1. Reactionvof pent 2 ene with h2so4 /hgso4 yields

Q.

H₂O₂ 2H⁺ + O₂ + 2e^- ; E⁰ = - 0.68V

Which of the following nature of $H_2$$O_2$ is represented by the above equation?

1. Acidic

2. Bleaching

3. Reducing

4. Oxidising

Q.

Reaction of granulated zinc with dil HCl results in formation of:

1. Tritium

2. Protium

3. Dihydrogen

4. HD

Q. On electrolysis of aqueous sodium sulphate using platinum electrodes, the product formed at cathode and anode are respectively:

1. $Na,O_2$
2. $O_2,S{O}_2$
3. $H_2,O_2$
4. $Na,S{O}_2$

Q.

Hydrogen can be obtained from water by

1. Reaction with metal oxides

2. Reaction with non-metal oxides

3. Reaction with metals

4. Reaction with metal hydrides

Q. why the Tetrachloro methane is not hydrolysed ?

Q. 25 Znso4(anhyd.) Contains 40.37% Zn, then the mass of zinc required to give 40g zinc sulphate will be

Q.

Here X, Y, Z are respectively

Q.

Which of the following will not produce hydrogen gas?

1. Electrolysis of mildly acidified water

2. Electrolysis of NaCl in Nelson's cell

3. Reaction of Zn with concentrated $H_{2}S{O}_4$

4. Reaction of Zn with NaOH

Q. Match each entry in Column - I with only one entry from Column - II
for the given properties/applications mentioned therein:

$\begin{array}{cccc}& & & \\ & Column-I& & Column-II\\ \left(a\right)& H& \left(p\right)& Usedinthenameofperhydrol\\ \left(b\right)& H_2& \left(q\right)& CanbereducedtodihydrogenbyNaH\\ \left(c\right)& H_{2}O& \left(r\right)& Canbeusedinhydroformylationofolefin\\ \left(d\right)& H_2{O}_2& \left(s\right)& Canbeusedincuttingandwelding\end{array}$

1. (a) $\to$ (s); (b) $\to$ (r); (c) $\to$ (q); (d) $\to$ (p)
2. (a) $\to$ (p); (b) $\to$ (r); (c) $\to$ (q); (d) $\to$ (s)
3. (a) $\to$ (s); (b) $\to$ (q); (c) $\to$ (r); (d) $\to$ (p)
4. (a) $\to$ (r); (b) $\to$ (s); (c) $\to$ (q); (d) $\to$ (p)

Q. Which of the following metal(s) on treatment with NaOH will liberate $H_2$ gas?

1. Zn
2. Sn
3. Al
4. Mg

Q. Choose the correct statement about the industrial preparation of hydrogen from water gas $(CO+H_2)$.

1. $CO$ and $H_2$, are fractionally separated using differences in their densities
2. $CO$ is removed by absorption in aqueous $C{u}_{2}C{l}_2$ solution
3. $H_2$ is removed through occlusion with $Pd$
4. $CO$ is oxidised to $C{O}_2$ with steam in the presence of a catalyst followed by absorption of $C{O}_2$ in alkali

Q.

Water gas is produced by

1. Passing steam over red-hot coke

2. Passing steam and air over red-hot coke

3. Burning coke in excess of air

4. Burning coke in limited supply of air

Q. A small amount of NH4HS is placed in a flaskalready containing ammonia gas at a certaintemperature and 0.50 atm pressure. Ammoniumhydrogen sulphide decomposes to yield NH3 andH2S gases in the flask. When the decompositionreaction reaches equilibrium, the total pressure inthe flask rises to 0.84 atm. The equilibriumconstant for NHHS decomposition at thistemperature is

Q. Less reactive metal aluminium on heating with water produces:

1. Aluminium Hydroxide and Hydrogen gas
2. Aluminium oxide and Hydrogen gas
3. Aluminium Hydroxide, Aluminium oxide and Hydrogen gas
4. None of the above

Q. Hydrogen is not obtained when zinc reacts with:

1. Cold water
2. Hot $NaOH$ solution
3. $Conc.H_{2}S{O}_4$
4. Dil. $HCl$

Q. 15 : As compared to lithium sodium reacts quickly with water because? Why?

Q. Match the terms in Column - I with the relevant item in Column - II
$\begin{array}{cccc}& & & \\ & Column-I& & Column-II\\ \left(a\right)& Electrolysisofwaterproduces& \left(p\right)& Atomicreactor\\ \left(b\right)& Lithiumaluminiumhydrideisusedas& \left(q\right)& Polarmolecule\\ \left(c\right)& Hydrogenchlorideisa& \left(r\right)& Combinesonmetalsurfacetogeneratehightemperature\\ \left(d\right)& Heavywaterisusedin& \left(s\right)& Reducingagent\\ \left(e\right)& Atomichydrogen& \left(t\right)& Hydrogenandoxygen\end{array}$

1. (a) $\to$ (s, t); (b) $\to$ (s); (c) $\to$ (q); (d) $\to$ (p); (e) $\to$ (r, s)
2. (a) $\to$ (s, t); (b) $\to$ (p); (c) $\to$ (q); (d) $\to$ (s); (e) $\to$ (r, s)
3. (a) $\to$ (r, s); (b) $\to$ (s); (c) $\to$ (q); (d) $\to$ (p); (e) $\to$ (s, t)
4. (a) $\to$ (q); (b) $\to$ (s); (c) $\to$ (s, t); (d) $\to$ (p); (e) $\to$ (r, s)

Q. Predict the product A and B in the following reaction :
$Fe+dilHCl\to A+B$

1. $A=FeC{l}_2,B=H_2$
2. No reaction will take place
3. $FeC{l}_3,B=H_2$
4. $A=FeC{l}_2,B=C{l}_2$