Hydrogen & S-Block elements Test

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Hydrogen & S-Block elements Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Statement-1: For normal biological functions in human body, barium is not needed.

Statement-2: Barium does not show variable oxidation state.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Both assertion and reason are correct but reason is not correct explanation of assertion. For normal biological functions of human body we need Ma, K.
Question 2
1 / -0

Which of the following reactions take place at elevated temperature (500 – 550°C) and high pressure in the presence of a catalyst?

A
None of these

B
Hydrogen reacts with oxygen to form water

C
Hydrogen reacts with Nitrogen to form Ammonia

D
Saturation of ethylene to ethane by hydrogen

Solution

Hydrogen reacts with oxygen on electrical sparking. Saturation of ethylene to ethane by hydrogen occurs at elevated temperatures in the presence of a catalyst but not at 500 - 550°C. The correct option is reaction of Hydrogen with Nitrogen which occurs at the above conditions.
Question 3
1 / -0

Which of the following is true?

A
Oxidation state of oxygen in KO₂ is –1

B
Sodium amalgam is better reducing agent than hydrogen

C
Sodium when heated in excess of oxygen it gives sodium oxide

D
Sodium Nitrate on heating gives nitrogen dioxide

Solution

In Sodium peroxide is produced, Oxidation State of Oxygen in KO₂ is –1/2, and the reaction, does not produce NO₂.
Question 4
1 / -0

Which of the following hydroxide is soluble in water?

A
Ba(OH)₂

B
Mg(OH)₂

C
Be(OH)₂

D
Ca(OH)₂

Solution

The solubility of the hydroxides increases with increase in atomic number of the elements.
Question 5
1 / -0

The species that do not contain peroxide ions are

A
H₂O₂

B
SrO₂

C
Ba0₂

D
PbO₂

Solution

Only H₂O₂ (hydrogen peroxide) and BaO₂ (Barium peroxide) contain peroxide ions. So (a) and (c) are the correct choices.
Question 6
1 / -0

CO₂ is dissolved in water species that present in solutions are.

A
H₂CO₃,CO₃^2–

B
CO₂,H₂CO₃

C
CO₂,H₂CO₃,HCO₃^–,CO₃^2–

D
CO₃^2–,HCO₃^–

Solution

CO₂ + H₂O ⇌ H₂CO₃ ⇌ H+ HCO^-₃ ⇌ H⁺ + CO₃^-2.
Question 7
1 / -0

Which of the hydroxides are sublime on heating are:

A
RbOH

B
Mg(OH)₂

C
KOH

D
LiOH

Solution

For alkali metal hydroxide, the thermal stability increases on moving from Li to Cs, however, they sublime at about 400°C and the vapours mainly consists of dimer, (MOH)₂.
Lithium is much electropositive, and therefore, LiOH is less stable (similarity with Mg). For example

2LiOH → Li₂O + H₂O

Mg(OH)₂ → MgO + H₂O

Thus all LiOH, KOH, RbOH and Mg(OH)₂ sublime on heating.
Question 8
1 / -0

Statement-1: The alkali metals can form ionic hydrides which contain the hydride ion H^–.

Statement-2: The alkali metals have low electro negativity; their hydrides conduct electricity when fused and liberate hydrogen at the anode.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Both Statement 1 and 2 are true; and 2 is the correct explanation of 1.
Question 9
1 / -0

NaCl is heated with Na vapour, a yellow non stoichiometric form of NaCl is formed. The extra electrons liberated ____.

A
Are sources of colour

B
Create F-centres

C
All of these

D
Occupy the anionic sites

Solution

The anionic site occupied by unpaired electron is called F-centre. When visible light falls over the crystal of NaCl, the unpaired electron present gets excited because of absorption of energy and impart yellow colour.
Question 10
1 / -0

Solubility of alkaline earth metal hydroxides [M(OH)₂] in the decreasing order is

A
Be = Mg > Ca > Sr > Ba

B
Mg < Be < Ca < Ba < Sr

C
Ba > Sr > Ca > Mg > Be

D
Be < Mg < Ca < Sr < Ba

Solution

In alkaline earth metal hydroxides, solubility increases down the group since the lattice energy is decreasing down the group.

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Hydrogen & S-Block elements Test - 2

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Hydrogen & S-Block elements Test - 2

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Question 1

Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

Statement-1 is true but Statement-2 is false.

Statement-1 is false but Statement-2 is true.

Solution

Question 2

None of these

Hydrogen reacts with oxygen to form water

Hydrogen reacts with Nitrogen to form Ammonia

Saturation of ethylene to ethane by hydrogen

Solution

Question 3

Oxidation state of oxygen in KO2 is –1

Sodium amalgam is better reducing agent than hydrogen

Sodium when heated in excess of oxygen it gives sodium oxide

Sodium Nitrate on heating gives nitrogen dioxide

Solution

Question 4

Ba(OH)2

Mg(OH)2

Be(OH)2

Ca(OH)2

Solution

Question 5

H2O2

SrO2

Ba02

PbO2

Solution

Question 6

H2CO3,CO32–

CO2,H2CO3

CO2,H2CO3,HCO3–,CO32–

CO32–,HCO3–

Solution

Question 7

RbOH

Mg(OH)2

KOH

LiOH

Solution

Question 8

Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

Statement-1 is true but Statement-2 is false.

Statement-1 is false but Statement-2 is true.

Solution

Question 9

Are sources of colour

Create F-centres

All of these

Occupy the anionic sites

Solution

Question 10

Be = Mg > Ca > Sr > Ba

Mg < Be < Ca < Ba < Sr

Ba > Sr > Ca > Mg > Be

Be < Mg < Ca < Sr < Ba

Solution

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Oxidation state of oxygen in KO₂ is –1

Ba(OH)₂

Mg(OH)₂

Be(OH)₂

Ca(OH)₂

H₂O₂

SrO₂

Ba0₂

PbO₂

H₂CO₃,CO₃^2–

CO₂,H₂CO₃

CO₂,H₂CO₃,HCO₃^–,CO₃^2–

CO₃^2–,HCO₃^–

Mg(OH)₂