The s-Block Elements Test 10

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The s-Block Elements Test 10

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Weekly Quiz Competition

Question 1
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In the table calcium lies above barium. Which one is more reactive?

A
Calcium

B
Barium

C
Both are equally reactive

D
Nothing could be predicted

Solution

Barium is more reactive than Calcium.
The two outer electrons in Barium are further from the positive nucleus and so are less strongly held in place.
These means that Barium is able to release these two electrons more easily than Calcium.
Hence Barium is more reactive.
Question 2
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_____ does not exist in solid state.

A
$$NaHCO_3$$

B
$$NaHSO_3$$

C
$$LiHCO_3$$

D
$$CaCO_3$$

Solution

Lithium carbonate has low solubility in water. Its solubility increases under a mild pressure of carbon dioxide and this effect is due to the formation of metastable bicarbonate which is more soluble.

So, the correct option is $$C$$
Question 3
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Directions For Questions

Out of the elements marked A, B, C, D, E, F, G and H

...view full instructions

Out of the given elements, which elements forms superoxide?

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

B
$$E$$ and $$G$$

C
$$B$$ and $$D$$

D
$$A$$ and $$C$$

Solution

E and G form super oxide due to stable lattice formed by the packing of bigger cations with bigger anions. E and G are K and Rb respectively. They form superoxides $$\displaystyle KO_2$$ and $$\displaystyle RbO_2 $$ respectively.
Question 4
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Which of the following pairs shows diagonal relationship?

A
$$Na$$ and $$Mg$$

B
$$Li$$ and $$Mg$$

C
$$Li$$ and $$Na$$

D
$$Al$$ and $$C$$

Solution

A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods of the periodic table. Thus, $$Li$$ and $$Mg$$ are diagonally related.
Question 5
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Sodium burns in dry air to ordinarily give:

A
$$Na_2O$$

B
$$Na_2O_2$$

C
$$NaO_2$$

D
$$Na_3N$$

Solution

Sodium burns in dry air to give $$Na_2O$$.
$$2Na+\dfrac12 O_2\rightarrow Na_2O$$
Question 6
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The lightest alkaline earth metal is :

A
$$Be$$

B
$$Mg$$

C
$$Ca$$

D
$$Ba$$

Solution

$$Be$$ is the lightest alkaline metals.
Question 7
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Compare $$Li$$ and $$Be$$ according to the polarisation of cations :

A
$$Li^{+}\, <\, Be^{2+}$$

B
$$Li^{+}\, >\, Be^{2+}$$

C
$$Li^{+}\, =\, Be^{2+}$$

D
None of these

Solution

As the charge on the ion increases and size decreases polarization incresases,so the correct order of polarization $$Li^{+}\, <\, Be^{2+}$$
Hence option A is correct.
Question 8
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Which of the following statement is not correct?

A
$$KOH$$ is a stronger alkali than $$NaOH$$

B
Milk of magnesia is an aqueous suspension of $$Mg(OH)_2$$

C
$$MgO$$ is a refractory material used for lining electrical furnaces

D
$$MgCl_2.\, 6H_2O$$ on heating yields $$Mg(OH)_2$$

Solution

Hydrated form of magnesium chloride on heating yield anhydrous magnesium chloride as it loses its water of crystallization and does not undergo any reaction with water forming hydroxide.
Question 9
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Extremely electropositive metals are present in______in______ groups.

A
IIA and IIIA

B
IA and IIA

C
IIIA and IVA

D
IVA and VIIA

Solution

The elements of group $$IA$$ and $$IIA$$ easily lose electrons to attain inert gas configuration. Thus they have highly electropositive nature. Thus the correct answer is option B
Question 10
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The most lightest alkaline earth metal is:

A
$$Be$$

B
$$Mg$$

C
$$Ca$$

D
$$Ba$$

Solution

Calcium $$(Z=20),$$ is the lightest alkaline earth metal, with a density of $$1.55 g/cm^3$$, lighter than both beryllium and magnesium.

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The s-Block Elements Test 10

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The s-Block Elements Test 10

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SHARING IS CARING

Question 1

Calcium

Barium

Both are equally reactive

Nothing could be predicted

Solution

Question 2

$$NaHCO_3$$

$$NaHSO_3$$

$$LiHCO_3$$

$$CaCO_3$$

Solution

Question 3

$$A$$ and $$B$$

$$E$$ and $$G$$

$$B$$ and $$D$$

$$A$$ and $$C$$

Solution

Question 4

$$Na$$ and $$Mg$$

$$Li$$ and $$Mg$$

$$Li$$ and $$Na$$

$$Al$$ and $$C$$

Solution

Question 5

$$Na_2O$$

$$Na_2O_2$$

$$NaO_2$$

$$Na_3N$$

Solution

Question 6

$$Be$$

$$Mg$$

$$Ca$$

$$Ba$$

Solution

Question 7

$$Li^{+}\, <\, Be^{2+}$$

$$Li^{+}\, >\, Be^{2+}$$

$$Li^{+}\, =\, Be^{2+}$$

None of these

Solution

Question 8

$$KOH$$ is a stronger alkali than $$NaOH$$

Milk of magnesia is an aqueous suspension of $$Mg(OH)_2$$

$$MgO$$ is a refractory material used for lining electrical furnaces

$$MgCl_2.\, 6H_2O$$ on heating yields $$Mg(OH)_2$$

Solution

Question 9

IIA and IIIA

IA and IIA

IIIA and IVA

IVA and VIIA

Solution

Question 10

$$Be$$

$$Mg$$

$$Ca$$

$$Ba$$

Solution

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