The s-Block Elements Test

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The s-Block Elements Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Beryllium carbonate is unstable and can be kept only in the atmosphere of

A
CO₂

B
NO₂

C
SO₂

D
O₂

Solution

Beryllium carbonate is reported to be unstable under normal conditions and decomposes into BeO and CO₂so it has to be stored under CO₂ to maintain equllibrium.

BeCO₃ ↔ BeO+CO₂
Question 2
1 / -0

Radium salts are used in

A
the treatment of infectious diseases

B
the treatment of cancer

C
the treatment of metal sheets

D
the treatment of tuberculosis

Solution

Radium salts are used in radiotherapy, for example, in the treatment of cancer.
Question 3
1 / -0

Choose the correct order of decrease in hydration enthalpies of alkaline earth metals in the options given below

A
Ca²⁺ < Sr²⁺ < Ba²⁺ < Be²⁺ < Mg²⁺

B
Be²⁺ < Mg²⁺ < Ca²⁺ < Sr²⁺ < Ba²⁺

C
Mg²⁺< Ca²⁺< Sr²⁺< Ba²⁺< Be²⁺

D
Sr²⁺ < Ba²⁺ < Be²⁺ < Mg²⁺ < Sr²⁺

Solution

As the size increases due to increase in ionic radii , hydration energy decreases.
Question 4
1 / -0

Why does the solubility of alkaline earth metal carbonates and sulphates in water decrease down the group?

A
lattice enthalpy decreases down the group

B
coordination numbesr more than four

C
hydration enthalpy decreases down the group

D
size of anions being much shorterer compared to cations

Solution

Solubility of sulphates and carbonates decreases down the group because of decrease in hydration energy. which is insufficient to over come the lattice energy of ions.
Question 5
1 / -0

Calcium oxide is prepared on a commercial scale by using

A
limestone and Castner-Kellner cell

B
limestone and Daniell cell

C
limestone and rotary kiln

D
limestone and Solvay process

Solution

Rotary kiln is used for calcination of limestone (CaCO₃) to produce calcium oxide(quicklime)

CaCO₃→ CaO + CO₂
Question 6
1 / -0

Heating a pulverised mixture of limestone and clay in a rotary kiln is used in the manufacture of:

A
Plaster of Paris

B
Lime

C
Portland cement

D
Slaked lime

Solution

Heating a pulverised mixture of limestone and clay in a rotary kiln is used in the manufacture of Portland cement. Cement is a product obtained by combining a material rich in lime, CaO with other material such as clay which contains silica, SiO₂ along with the oxides of aluminium, iron and magnesium.
Question 7
1 / -0

Cement is an industrially important compound of

A
Calcium

B
Magnesium

C
Sodium

D
Potassium

Solution

Cement is the important compound of Calcium. Cement is a product obtained by combining a material rich in lime, CaO with other material such as clay which contains silica, SiO₂ long with the oxides of aluminium, iron and magnesium.
Question 8
1 / -0

The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30^∘C?

A
Rb

B
K

C
Cs

D
Na

Solution

Cs has very low melting point (24.44 degree Celsius). It can melt even with the heat of the hand.
Question 9
1 / -0

Alkali metals react with water vigorously to form hydroxides and dihydrogen.Which of the following alkali metals reacts with water least vigorously?

A
Cs

B
Na

C
K

D
Li

Solution

Li reacts with water least vigorously, since the density of Li is only about half that of water,so it floats on the surface and ultimately dissappears,giving off H₂ gas
Question 10
1 / -0

The reducing power of a metal depends on various factors. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.

A
Ionisation enthalpy

B
Electron-gain enthalpy

C
Sublimation enthalpy

D
Hydration enthalpy

Solution

High hydration energy of Li makes it’s a very good reducing agent. Its hydration energy compensates the high ionization energy.

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Re-Attempt Weekly Quiz Competition

The s-Block Elements Test - 6

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The s-Block Elements Test - 6

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Question 1

CO2

NO2

SO2

O2

Solution

Question 2

the treatment of infectious diseases

the treatment of cancer

the treatment of metal sheets

the treatment of tuberculosis

Solution

Question 3

Ca2+ < Sr2+ < Ba2+ < Be2+ < Mg2+

Be2+ < Mg2+ < Ca2+ < Sr2+ < Ba2+

Mg2+< Ca2+< Sr2+< Ba2+< Be2+

Sr2+ < Ba2+ < Be2+ < Mg2+ < Sr2+

Solution

Question 4

lattice enthalpy decreases down the group

coordination numbesr more than four

hydration enthalpy decreases down the group

size of anions being much shorterer compared to cations

Solution

Question 5

limestone and Castner-Kellner cell

limestone and Daniell cell

limestone and rotary kiln

limestone and Solvay process

Solution

Question 6

Plaster of Paris

Lime

Portland cement

Slaked lime

Solution

Question 7

Calcium

Magnesium

Sodium

Potassium

Solution

Question 8

Rb

K

Cs

Na

Solution

Question 9

Cs

Na

K

Li

Solution

Question 10

Ionisation enthalpy

Electron-gain enthalpy

Sublimation enthalpy

Hydration enthalpy

Solution

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CO₂

NO₂

SO₂

O₂

Ca²⁺ < Sr²⁺ < Ba²⁺ < Be²⁺ < Mg²⁺

Be²⁺ < Mg²⁺ < Ca²⁺ < Sr²⁺ < Ba²⁺

Mg²⁺< Ca²⁺< Sr²⁺< Ba²⁺< Be²⁺

Sr²⁺ < Ba²⁺ < Be²⁺ < Mg²⁺ < Sr²⁺