Hydrogen Test

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Hydrogen Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

Which is used as hydrogen generators?

A
NaH

B
Hi

C
\(S_6H_3\)

D
None of these

Solution

\(NaH + H_2O\to NaOH + H_2\uparrow\)
Question 2
1 / -0

Which is distilled first?

A
Liquid \(CO_2\)

B
Liquid \(N_2\)

C
Liquid \(O_2\)

D
Liquid \(H_2\)

Solution

Boiling point of liquid hydrogen is lowest of given substances so it is distilled first.
Question 3
1 / -0

On reaction with Mg, very dilute nitric acid produces.

A
\(NH_3\)

B
Nitrous oxide

C
Nitric oxide

D
Hydrogen

Solution

\(Mg + 2HNO_3\to Mg (NO_3)_2 + H_2 \uparrow\)
Question 4
1 / -0

The nuclei of tritium \((H_3)\) atom would contain neutrons

A
1

B
2

C
3

D
4

Solution

Number of neutrons = Mass number - Atomic number

= 3 - 1

= 2
Question 5
1 / -0

The adsorption of hydrogen by metals is called

A
Dehydrogenation

B
Hydrogenation

C
Occlusion

D
Adsorption

Solution

Occlusion is the phenomenon of adsorption of hydrogen by metal.
Question 6
1 / -0

Which of the following produces hydrolith with dihydrogen?

A
Mg

B
Al

C
Cu

D
Ca

Solution

\(CaH_2\) is known as hydrolith.
Question 7
1 / -0

When electric current is passed through an ionic hydride in the molten state

A
Hydrogen is liberated at the anode.

B
Hydrogen is liberated at the cathode.

C
No reaction takes place

D
Hydride ion migrates towards cathode.

Solution

\(M^+ H^-\,\to M^+ + H^- H^-\,\to {\frac{1}{2}}H_2 + e^-\)
Question 8
1 / -0

Hydrogen acts as a reducing agent and thus resembles

A
Halogen

B
Noble gas

C
Radioactive elements

D
Alkali metals

Solution

Alkali metals are good reducing agents because of low ionization energy and hydrogen also shows same character.
Question 9
1 / -0

The velocity of neutrons in nuclear reactor is slowed down by

A
Heavy water \((D_2O)\)

B
Ordinary water \((H_2O)\)

C
Zinc rod

D
Fused caustic soda

Solution

Heavy water i.e., \(D_2O\) slows down the speed of neutrons in nuclear reactors.
Question 10
1 / -0

The molarity of pure water at 4°C is

A
1 M

B
2.5 M

C
5 M

D
55.5 M

Solution

The density of water is \(1 gcm^{-3}\) at 4°C

So molarity = \({\frac{1000}{18}}\)

= 55.5 M
Question 11
1 / -0

The alum used for purifying water is

A
Ferric alum

B
Chrome alum

C
Potash alum

D
Ammonium alum

Solution

\(K_2SO_4.Al_2 (SO_4)_3 .24H_2O\) Potash alum is generally used for purifying water.
Question 12
1 / -0

Hydrogen peroxide is reduced by

A
Ozone

B
Barium peroxide

C
Acidic solution of \(KMnO_4\)

D
Lead sulphide suspension

Solution

\(PbS + 4H_2O_2\to PbSO_4 + 4H_2O\)
Question 13
1 / -0

The volume of oxygen liberated from 0.68gm of \(H_2O_2\) is

A
112ml

B
224ml

C
56ml

D
336m

Solution

We know that \(2H_2O_2\to 2H_2O + O_2\)

\(2\times34g\) in 22400ml

\(2\times34gm\) = 68gm of \(H_2O_2\) liberates 22400ml \(O_2 \) at STP

68gm of \(H_2O_2\) liberates

=\(68\times{\frac{2240}{068}}\)

= 224ml
Question 14
1 / -0

HCl is added to following oxides. Which one would give \(H_2O_2\)?

A
\(MnO_2\)

B
\(PbO_2\)

C
\(BaO\)

D
None of these

Solution

\(MnO_2, PbO_2 \) and BaO will not give \(H_2O_2\) with \(HCl.MnO_2\) and \(PbO_2\) will give \(Cl_2\) and BaO will react with HCl to give \(BaCl_2\) and water.
Question 15
1 / -0

Polyphosphates are used as water softening agents because they

A
Form soluble complexes with anionic species

B
Precipitate anionic species

C
Forms soluble complexes with cationic species

D
Precipitate cationic species

Solution

Polyphosphates (sodium hexametaphosphates, sodium tripolyphosphate or STPP) from soluble complexes with \(Ca^{+2}, Mg^{+2}\) present in hard water.
Question 16
1 / -0

HCl is added to the following oxides which one would give \(H_2O_2\)

A
\(MnO_2\)

B
\(PbO_2\)

C
\(BaO_2\)

D
None of these

Solution

\(BaO_2 + 2HCl\to BaCl_2 + H_2\)
Question 17
1 / -0

What is the product of the reaction of \(H_2O_2\) with \(Cl_2\)

A
\(O_2\,+\,HOCl\)

B
\(HCl\,+\,O_2\)

C
\(H_2O\,+\,HCl\)

D
\(HCl\,+\,H_2\)

Solution

\(H_2O_2 \,+\,Cl_2\to2HCl + O_2\)
Question 18
1 / -0

Lead pipes are not used for carrying drinking water because

A
They are covered with a coating of lead carbonate

B
They are corroded by air and moisture

C
Water containing dissolved air attacks lead forming soluble hydroxide

D
None of these

Solution

Due to plumbosolvancy, lead dissolves in water to a small extent to form soluble hydroxide which is poisonous so lead pipe is not used for carrying drinking water.
Question 19
1 / -0

A commercial sample of hydrogen peroxide is labelled as 10 volumes. Its percentage strength is nearly

A
1%

B
3%

C
10%

D
90%

Solution

10 volume solution of \(H_2O_2\) is 3.035% solution i.e., 3.035 g of \(H_2O_2\) is present in 100ml of the solution.
Question 20
1 / -0

When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged with

A
\(H^+\,ions\)

B
\(Ca^{2+}\,ions\)

C
\(Mg^{2+}\,ions\)

D
Both \(Ca^{2+} \) and \(Mg^{2+}\)

Solution

Zeolite when treated with hard water exchange \(Ca^{2+}\) and \(Mg^{2+}\) ions (present in hard water) with \(Na^+\) ions.

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Hydrogen Test - 11

Result

Hydrogen Test - 11

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Question 1

NaH

Hi

\(S_6H_3\)

None of these

Solution

Question 2

Liquid \(CO_2\)

Liquid \(N_2\)

Liquid \(O_2\)

Liquid \(H_2\)

Solution

Question 3

\(NH_3\)

Nitrous oxide

Nitric oxide

Hydrogen

Solution

Question 4

1

2

3

4

Solution

Question 5

Dehydrogenation

Hydrogenation

Occlusion

Adsorption

Solution

Question 6

Mg

Al

Cu

Ca

Solution

Question 7

Hydrogen is liberated at the anode.

Hydrogen is liberated at the cathode.

No reaction takes place

Hydride ion migrates towards cathode.

Solution

Question 8

Halogen

Noble gas

Radioactive elements

Alkali metals

Solution

Question 9

Heavy water \((D_2O)\)

Ordinary water \((H_2O)\)

Zinc rod

Fused caustic soda

Solution

Question 10

1 M

2.5 M

5 M

55.5 M

Solution

Question 11

Ferric alum

Chrome alum

Potash alum

Ammonium alum

Solution

Question 12

Ozone

Barium peroxide

Acidic solution of \(KMnO_4\)

Lead sulphide suspension

Solution