Hydrogen Test

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Hydrogen Test - 61

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Weekly Quiz Competition

Question 1
1 / -0

The enthalpy change on freezing of 1 mol of water at $$5^oC$$ to ice at $$-5^oC$$ is:
$$[{ Given:\quad \triangle }_{ fus }H=6kJ{ mol }^{ -1 }at\ 0^oC,\ { C }_{ p }\left( { H }_{ 2 }O,l \right) =75.3J{ mol }^{ -1 }{ K }^{ -1 },{ C }_{ p }\left( { H }_{ 2 }O,s \right)$$$$=36.8J{ mol }^{ -1 }{ K }^{ -1 }]$$

A
$$-6.56kJ{ mol }^{ -1 }$$

B
$$-5.81kJ{ mol }^{ -1 }$$

C
$$-6.00kJ{ mol }^{ -1 }$$

D
$$-5.44kJ{ mol }^{ -1 }$$
Question 2
1 / -0

Which of the following will give $${H}_{2}$$ gas with dilute $${HNO}_{3}$$?

A
$$Mg$$

B
$$Zn$$

C
$$Cu$$

D
$$Hg$$

Solution

$$Mg+2HN{ O }_{ 3 }\rightarrow Mg{ \left( N{ O }_{ 3 } \right) }_{ 2 }+{ H }_{ 2 }\left( g \right) $$
$$'Mg'$$ being a strong reducing agent compared to zinc, copper and mercury produce hydrogen gas by reducing nitric acid.
Question 3
1 / -0

Hydrogen does not combine with ______.

A
Sb

B
Na

C
He

D
Zn

Solution

Since Helium (He) is a noble gas and does not combines with hydrogen. Because bond formation is only favored when the final state of the two elements is more stable than their initial state. If a hydrogen atom bonded with a helium atom, neither of their 1s and 2s atomic orbital will be half/fully filled, which causes both atoms to be energetically unstable. Such compound will most likely break down immediately back to their respective atomic state.
Question 4
1 / -0

Industrially, $${ H }_{ 2 }{ O }_{ 2 }$$ is obtained by the following cyclic process :
$$\begin{matrix} 2-Ethylanthraquinol \\ (P) \end{matrix}\overset { { O }_{ 2 } }{ \underset { { H }_{ 2 }/Pd }{ \rightleftharpoons } } \begin{matrix} 2-Ethylanthraquinone \\ (Q) \end{matrix}+{ H }_{ 2 }{ O }_{ 2 }$$
Which one of the following properties is wrong about the mixture of organic solvents in which the reaction is carried out?

A
It must resist oxidation.

B
It must be miscible with water.

C
It must dissolve both (P) and (Q).

D
It is generally a mixture of ester and hydrocarbon.

Solution

Industrially $$H-20_2$$ is obtained by this reaction
$$2$$ ethylanthraquinol $$ \frac {o_2} {H_2/pd} 2-$$ ethylanthraquinone
It is auto-oxidation of $$2$$- alkylanthraquints. The wrong statement is that, organic solvents should be miscible with water because it dissolves just like that, means the organic solvent wouldn't be miscible in water.
Question 5
1 / -0

Volume strength of $$500ml$$ solution containing $$3.4gm$$ of $${H_2}{O_2}$$ is

A
$$11.2$$

B
$$6.8$$

C
$$1.12$$

D
$$2.24$$
Question 6
1 / -0

A commercial sample of $${H_2}{O_2}$$ marked as 100 volume hydrogen peroxide, it means that

A
$${\rm{1}}\,\,{\rm{mL}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{give}}\,{\rm{100}}\,{\rm{mL}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$

B
$${\rm{1}}\,\,{\rm{L}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{will}}\,{\rm{give}}\,{\rm{100}}\,{\rm{mL}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$

C
$${\rm{1}}\,\,{\rm{L}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{will}}\,{\rm{give}}\,\ {\rm{22}}{\rm{.4L}}\,{\rm{}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$

D
None of these
Question 7
1 / -0

Very pure hydrogen $$(99.9\%)$$ can be made by which of the following processes?

A
Reaction of methane with steam

B
Mixing natural hydrocarbons of high molecular weight

C
Electrolysis of water

D
Reaction of salts like hydrides with water
Question 8
1 / -0

On shaking $$H_2O_2$$ with acidified potassium dichromate and ether, etheral layer becomes?

A
Green

B
Blue

C
Red

D
Colourless

Solution
Question 9
1 / -0

When barium chloride solution is added to sodium sulphate solution, a white precipitate is formed. The white precipitate is:

A
Barium chloride

B
Sodium sulphate

C
Barium sulphate

D
Sodium chloride
Question 10
1 / -0

$$H_2O_2$$ can be estimated by

A
Titration with acidified $$K_2Cr_2O_7$$

B
Titration with $$NaOH$$ solution

C
Titration with acidified $$KMnO_4$$ solution

D
Titration with $$Na_2CO_3$$ solution

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 61

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Hydrogen Test - 61

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SHARING IS CARING

Question 1

$$-6.56kJ{ mol }^{ -1 }$$

$$-5.81kJ{ mol }^{ -1 }$$

$$-6.00kJ{ mol }^{ -1 }$$

$$-5.44kJ{ mol }^{ -1 }$$

Question 2

$$Mg$$

$$Zn$$

$$Cu$$

$$Hg$$

Solution

Question 3

Sb

Na

He

Zn

Solution

Question 4

It must resist oxidation.

It must be miscible with water.

It must dissolve both (P) and (Q).

It is generally a mixture of ester and hydrocarbon.

Solution

Question 5

$$11.2$$

$$6.8$$

$$1.12$$

$$2.24$$

Question 6

$${\rm{1}}\,\,{\rm{mL}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{give}}\,{\rm{100}}\,{\rm{mL}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$

$${\rm{1}}\,\,{\rm{L}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{will}}\,{\rm{give}}\,{\rm{100}}\,{\rm{mL}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$

$${\rm{1}}\,\,{\rm{L}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{will}}\,{\rm{give}}\,\ {\rm{22}}{\rm{.4L}}\,{\rm{}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$

None of these

Question 7

Reaction of methane with steam

Mixing natural hydrocarbons of high molecular weight

Electrolysis of water

Reaction of salts like hydrides with water

Question 8

Green

Blue

Red

Colourless

Solution

Question 9

Barium chloride

Sodium sulphate

Barium sulphate

Sodium chloride

Question 10

Titration with acidified $$K_2Cr_2O_7$$

Titration with $$NaOH$$ solution

Titration with acidified $$KMnO_4$$ solution

Titration with $$Na_2CO_3$$ solution

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