The s-Block Elements Test 40

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The s-Block Elements Test 40

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement is not correct.

A
$$LiOH$$ is amphoteric in nature.

B
$$LiCl$$ is soluble in pyridine.

C
$$Li_3N$$ is stable while $$Na_3N$$ doesn't exist even at room temperature.

D
$$BeO$$ is amphoteric in nature.
Question 2
1 / -0

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

A
Sublimation enthalpy

B
Ionisation enthalpy

C
Hydration enthalpy

D
Electron-gain enthalpy

Solution

With the small size of $$Li^+$$ ion, lithium has the highest hydration enthalpy which accounts for its high negative $$E^{\circ}$$ value and its high reducing power.
Question 3
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Ionic mobility of $$L{ i }^{ + }$$ is less than that of $$N{ a }^{ + }$$ and $${ K }^{ + }$$ ions both, because:

A
ionisation potential of Li is small

B
charge density of $$L{ i }^{ + }$$ ion is high

C
hydration tendency of $$L{ i }^{ + }$$ ion is high

D
$$L{ i }^{ + }$$ has two electron

Solution

The alkali metal ion exist as hydrated ions $$M+(H_2O)_n$$ in the aqueous solution. The degree of hydration, decreases with ionic size as we go down the group. Hence $$Li^+$$ ion is mostly hydrated e.g. $$[Li(H_2O)_6]^+$$. Since the mobility of ions is inversely proportional to the size of the their hydrated ions, hence the increasing order of ionic mobility is $$Li^+$$.
Question 4
1 / -0

Both lithium and magnesium display several similar properties due to the diagonal relationship ; however, the one which is incorrect is :

A
Both form basic carbonates.

B
Both form soluble bicarbonates.

C
Both form nitrides.

D
Nitrates of both $$Li$$ and $$Mg$$ yield $${ NO }_{ 2 }$$ and $${ O }_{ 2 }$$ on heating.
Question 5
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When a solution of alkaline earth metal in liquid ammonia is evaporated:

A
they form hexammoniates , $$M(NH_{3})_{6}$$

B
The ammoniates decomposed at high temperatures

C
The tendency to form ammoniates decreses with increases in the size of the metal

D
The ammoniates are good conductors of electricity

Solution

When an alkaline earth metals dissolve readily in liquid ammonia,to form solvated metal cations and solvated electrons which give a solution of deep blue colour.

Now, when the G-1 solutions evaporate, we get the metal back, but in the case of G-2 solutions (except Beryllium), they give a metal complex, [M(NH3)6].
Question 6
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$$Be$$ and $$Al$$ exhibit a diagonal relationship. Which of the following statements about them is/are not true?
(i) Both react with HCI to liberate $$H_2$$.
(ii) They are made passive by $$HNO_3$$.
(iii) Their carbides give acetylene on treatment with water.
(iv) Their oxides are amphoteric.

A
(iii) and (iv)

B
(i) and (iii)

C
(i) only

D
(iii) only

Solution

The carbides of both Be and Al liberate methane with water.
$$Be_2C + 2H_2O \rightarrow 2BeO + CH_4$$
$$Al_4C_3 + 6H_2O \rightarrow 2Al_2O_3 + 3CH_4$$
Question 7
1 / -0

Incorrect statement about given carbohydrate is

A
Above compound is a reducing sugar

B
Above compound undergo mutarotation

C
Above compound is a non-reducing sugar

D
Above compound has a glycosidic linkage
Question 8
1 / -0

Which of the following product is obtained when bleaching powder is distilled with acetone?

A
$$CCl_4$$

B
$$CH_2Cl_2$$

C
$$CH_3 -CH_3$$

D
none of the above

Solution
Question 9
1 / -0

Decompostiion of $$Ag_{2}CO_{3}$$ in

A
$$T > 300^{o}C$$

B
$$T > 100^{o}C$$

C
$$both$$

D
$$none$$
Question 10
1 / -0

Correct order is :

A
$$\mathrm { MgO } < \mathrm { NiO } < \mathrm { K } _ { 2 } \mathrm { O } < \mathrm { CS } _ { 2 } {O } $$ (basic strength )

B
$$\mathrm { Cs } ^ { + } < \mathrm { K } ^ { + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Be } ^ { 2 + }$$ (ionic moblity in aqueous
solution)

C
$$\mathrm { Li } _ { 2 } \mathrm { CO } _ { 3 } < \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } < \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 }$$ (solubility order)

D
$$\mathrm { NH } _ { 3 } < \mathrm { PH } _ { 3 } < \mathrm { AsH } _ { 3 }$$ (thermal stability)

Solution

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The s-Block Elements Test 40

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Question 1

$$LiOH$$ is amphoteric in nature.

$$LiCl$$ is soluble in pyridine.

$$Li_3N$$ is stable while $$Na_3N$$ doesn't exist even at room temperature.

$$BeO$$ is amphoteric in nature.

Question 2

Sublimation enthalpy

Ionisation enthalpy

Hydration enthalpy

Electron-gain enthalpy

Solution

Question 3

ionisation potential of Li is small

charge density of $$L{ i }^{ + }$$ ion is high

hydration tendency of $$L{ i }^{ + }$$ ion is high

$$L{ i }^{ + }$$ has two electron

Solution

Question 4

Both form basic carbonates.

Both form soluble bicarbonates.

Both form nitrides.

Nitrates of both $$Li$$ and $$Mg$$ yield $${ NO }_{ 2 }$$ and $${ O }_{ 2 }$$ on heating.

Question 5

they form hexammoniates , $$M(NH_{3})_{6}$$

The ammoniates decomposed at high temperatures

The tendency to form ammoniates decreses with increases in the size of the metal

The ammoniates are good conductors of electricity

Solution

Question 6

(iii) and (iv)

(i) and (iii)

(i) only

(iii) only

Solution

Question 7

Above compound is a reducing sugar

Above compound undergo mutarotation

Above compound is a non-reducing sugar

Above compound has a glycosidic linkage

Question 8

$$CCl_4$$

$$CH_2Cl_2$$

$$CH_3 -CH_3$$

none of the above

Solution

Question 9

$$T > 300^{o}C$$

$$T > 100^{o}C$$

$$both$$

$$none$$

Question 10

$$\mathrm { MgO } < \mathrm { NiO } < \mathrm { K } _ { 2 } \mathrm { O } < \mathrm { CS } _ { 2 } {O } $$ (basic strength )

$$\mathrm { Cs } ^ { + } < \mathrm { K } ^ { + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Be } ^ { 2 + }$$ (ionic moblity in aqueoussolution)

$$\mathrm { Li } _ { 2 } \mathrm { CO } _ { 3 } < \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } < \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 }$$ (solubility order)

$$\mathrm { NH } _ { 3 } < \mathrm { PH } _ { 3 } < \mathrm { AsH } _ { 3 }$$ (thermal stability)

Solution

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$$\mathrm { Cs } ^ { + } < \mathrm { K } ^ { + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Be } ^ { 2 + }$$ (ionic moblity in aqueous
solution)