The s-Block Elements Test 13

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The s-Block Elements Test 13

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Weekly Quiz Competition

Question 1
1 / -0

What is the correct formula for lithium fluoride?

A
$$LiF$$

B
$${Li}_{2}{F}_{2}$$

C
$${Li}_{3}{F}_{9}$$

D
$$Li{F}_{7}$$

E
$${Li}_{7}{F}_{19}$$

Solution

$$LiF$$ is the correct formula for lithium fluoride. $$Li$$ has a +1 charge and $$F$$ has a -1 charge so, when they come together, to form $$LiF$$ having an ionic bond.
Question 2
1 / -0

What happens if we take excess intake of potassium?

A
Hypokalemia

B
Hypertension

C
Hyperkalemia

D
Low blood pressure

Solution

Hyperkalemia is the medical term that describes a potassium level in your blood that's higher than normal.
Question 3
1 / -0

Which of the following forms only covalent bonds with other elements?

A
Calcium

B
Barium

C
Radium

D
Beryllium

Solution

Beryllium's chemical behavior is largely a result of its small atomic and ionic radii. It thus has very high ionization potentials and strong polarization while bonded to other atoms, which is why all of its compounds are covalent.
They form covalent bonds whereas the other members form of the group form ionic bonds.
Question 4
1 / -0

Which element has high concentration in plants, as compared to sodium?

A
Potassium

B
Calcium

C
Silicon

D
none

Solution

Plants need a small amount but high concentration of K for specific functions in the cytoplasmand a major portion (∼90%) of it is localized in vacuoles, where it acts as an osmoticum. Maintenance can be achieved by other cation like sodium too .
Question 5
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Among the alkaline earth metals, the element forming predominantly covalent compound is:

A
barium

B
beryllium

C
strontium

D
calcium

Solution

Option $$(B)$$ is correct.
Beryllium predominantly forms covalent compound due to its small size (can't ionize easily). It has a smaller atomic radius and a large effective nuclear charge, it forms a covalent bond.
Beryllium shows a diagonal relationship with aluminium.
Question 6
1 / -0

Which of the following physical property of beryllium makes it perfect aerospace material?

A
High thermal conductivity

B
Low density

C
Both $$A$$ and $$B$$

D
Beryllium is not suitable for aerospace mateerial

Solution

It should be light to make aerospace material. Beryllium has low density and also has high thermal conductivity.
Question 7
1 / -0

Which of the following has highest melting point?

A
Magnesium

B
Barium

C
Calcium

D
Beryllium

Solution

Beryllium has highest melting point (1560 K).
In fact, the melting point, the boiling point and the ionisation enthalpy of beryllium are highest of all the alkaline earth metals. This is due to small atomic size of beryllium.
Question 8
1 / -0

What is minimum requirement (in milligram) of potassium per day for adult?

A
4700

B
14700

C
20000

D
30000

Solution

The minimum requirement of potassium per day for an adult is $$4700\ mg$$.

Potassium is very important in cellular biochemical reactions and energy metabolism.

Along with sodium, it regulates the water balance and the acid-base balance in the blood and tissues.

Thus, potassium is a very important mineral for our body.
Question 9
1 / -0

Which of the following hydrolyze in aqueous solution?

A
Barium salt

B
Beryllium salt

C
Calcium salt

D
Radium salt

Solution

Beryllium salts hydrolyze in aqueous solution producing $${H_3O}^+$$ ions.This is due the formation of stronger $$Be-O$$ bond.
Other salts do not hydrolyze in aqueous solution.
Question 10
1 / -0

Elements of Alkaline earth metals combine with carbon in an electric furnace to form carbides of type, $$MC_2$$ except :

A
Mg

B
Ba

C
Be

D
Sr

Solution

'Be' hs small size, relatively high electronegativity and only four orbitals vacances shell. Due to this small size it donot fom carbide because removing 'e-' from 'Be' is not easy.

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The s-Block Elements Test 13

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The s-Block Elements Test 13

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Question 1

$$LiF$$

$${Li}_{2}{F}_{2}$$

$${Li}_{3}{F}_{9}$$

$$Li{F}_{7}$$

$${Li}_{7}{F}_{19}$$

Solution

Question 2

Hypokalemia

Hypertension

Hyperkalemia

Low blood pressure

Solution

Question 3

Calcium

Barium

Radium

Beryllium

Solution

Question 4

Potassium

Calcium

Silicon

none

Solution

Question 5

barium

beryllium

strontium

calcium

Solution

Question 6

High thermal conductivity

Low density

Both $$A$$ and $$B$$

Beryllium is not suitable for aerospace mateerial

Solution

Question 7

Magnesium

Barium

Calcium

Beryllium

Solution

Question 8

4700

14700

20000

30000

Solution

Question 9

Barium salt

Beryllium salt

Calcium salt

Radium salt

Solution

Question 10

Mg

Ba

Be

Sr

Solution

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