Preparation of Hydrogen

Q.

What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.

1. Hydrogen gas and Iron chloride are produced

2. Chlorine gas and Iron hydroxide are produced

3. No reaction takes place

4. Iron salt and water are produced

Q. The overall reaction of a hydrogen-oxygen fuel cell is:

1. $2H_2\left(g\right)+O_2\left(g\right)\to 2H_{2}O\left(l\right)$

2. $2H_2\left(g\right)+4O{H}^{-}\left(aq\right)\to 4H_{2}O\left(l\right)+4e^{-}$

3. $O_2\left(g\right)+2H_{2}O\left(l\right)+4e^{-}\to 4OH\left(aq\right)$

4. $2H_{2}O\left(l\right)\to 2H_2\left(g\right)+O_2\left(g\right)$

Q.

When magnesium and hydrochloric acid react, they produce

1. Oxygen and magnesium chloride

2. Chlorine and magnesium oxide

3. Hydrogen and magnesium chloride

4. hydrogen and magnesium oxide

Q.

Color of magnesium oxide is:

1. White

2. Blue

3. Grey

4. Pink

Q.

Explain combination and decomposition reactions with suitable examples?

Q.

Dihydrogen of high purity $\left(>99.95\%\right)$ is obtained through

1. The electrolysis of acidified water using $\mathrm{Pt}$ electrodes.

2. The reaction of $\mathrm{Zn}$ with dilute $\mathrm{HCl}$.

3. The electrolysis of brine solution.

4. The electrolysis of warm $\mathrm{Ba}{\left(\mathrm{OH}\right)}_2$.

Q.

Take about 2 g of lead nitrate in a boiling tube and heat it, what do you observe?

Q. The INCORRECT statement(s) about heavy water is (are)
(A) Used as a moderator in a nuclear reactor
(B) Obtained as a by-product in the fertilizer industry
(C) Used for the study of the reaction mechanism
(D) Has a higher dielectric constant than water
Choose the correct answer from the option given below:
​​​​​​

1. (B) only
2. (B) and (D) only
3. (C) only
4. (D) only

Q. Very pure hydrogen is obtained by

1. Cracking of naphtha and fuel cell

2. Reaction of coal or CO with steam

3. Electrolysis of warm, aqueous solution of Ba(OH)₂ between nickel electrodes

4. Adding zinc granules to all acids

Q.

How can the production of dihydrogen, obtained from 'coal gastification', be increased?

Q.

Is sodium Acidic or alkaline?

Q. An aqueous solution of NaCl on electrolysis gives H2, Cl2 and NaOH according to the equation 2Cl- aq + 2H2O =2OH- AQ + H2g +Cl2 g A direct current of 25ampere with a current efficiency of 62% is passed through 20l of NaCl solution (20% by weight) then, the time taken to produce 1kj of cl2 and the molarity of the solution wrt hydroxide ion is

Q.

An example of a complex salt is

1. zinc sulphate

2. sodium hydrogen sulphate

3. iron (II) ammonium sulphate

4. tetraamine copper (II) sulphate

Q.

Match List-I with List-II

List-I	List-II
a. Sodium Carbonate	i. Deacon
b. Titanium	ii. Caster-Kellner
c. Chlorine	iii. Van-Arkel
d. Sodium hydroxide	iv. Solvay

Q.

During electrolysis, the reaction that takes place at cathode is:

1. Hydrolysis

2. Reduction

3. Neutralization

4. Oxidation

Q.

Which catalyst is used in Bosch process?

Q.

When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.

Q. 59 Write the reactions at cathode and anode during electrolytic reduction of aluminium oxide.

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

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

Q.

Q. Will copper with concentrated HCL produce hydrogen gas ?

Q. For the reaction of one mole of zinc dust with one mole of sulphuric acid in a Bomb calorimeter, ∆U and w correspond to

A) ∆U < 0, w= 0

B) ∆U = 0 , w < 0

C) ∆U > 0 , w=0

D) ∆U < 0, w > 0
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what should be the answer of this question according to you and why please explain in detail.

Q.

Sodium metal reacts with hot water to form sodium hydroxide and hydrogen gas.

1. True
2. False

Q.

Which gas is used in the Bosch process?

Q.

why is lead not affected by dilute hcl in cold???

Q.

In Haber's process of preparation on NH₃, iron and molybdenum are added. They role of each is

1. Fe is catalyst and Mo is promoter

2. Mo is catalyst and Fe is promoter

3. Catalyst

4. Promoter

Q.

Methane reacts with chlorine in the presence of sunlight and gives ___________.

1. Ethyl chloride

2. Hydrogen chloride

3. Methyl chloride and hydrogen chloride

4. Methyl chloride

Q. High purity (> 99.95%) dihydrogen is obtained by:

1. Electrolysis of acidified water using platinum electrodes
2. Electrolyzing warm aq. $Ba(OH{)}_2$ using nickel anode and iron cathode
3. Electrolysis of brine solution
4. Reaction of steam on hydrocarbons or coke at high temperature in the presence of catalyst

Q.

What happens when white phosphorus is heated with concentrated $\mathrm{NaOH}$ solution in an inert atmosphere of ${\mathrm{CO}}_2$?

Q.

Metals generally react with dilute acids to produce Hydrogen gas. Which one of the following metals does not react with dilute Hydrochloric acid?

1. Magnesium

2. Aluminum

3. Iron

4. Copper

Q. Which of the following is the most suitable drying agent for ammonia gas?

1. Calcium oxide
2. Anhydrous calcium chloride
3. Phosphorus pentaoxide
4. Conc. sulphuric acid