The s-Block Elements Test 18

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The s-Block Elements Test 18

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following elements will form a compound with oxygen in which one atom of the element is combined with one atom of oxygen to form an oxide of formula MO?

A
Be

B
Ne

C
Al

D
Cl

Solution

Be forms $$BeO$$,Al forms $$Al_2O_3$$, Cl forms $$Cl_2O_7$$, $$Cl_2O$$, $$ClO_2$$ etc.while Ne does not react with oxygen as it is a noble gas. Thus Be is the element which forms oxide of MO type with oxygen.
Question 2
1 / -0

The activity of alkaline earth metals as reducing agent :

A
decreases from $$Be$$ to $$Ba$$

B
increases from $$Be$$ to $$Ba$$

C
increases from $$Be$$ to $$Ca$$ and decreases from $$Ca$$ to $$Ba$$

D
decreases from $$Be$$ to $$Ca$$ and increases from $$Ca$$ to $$Ba$$

Solution

The activity of alkaline earth metals as reducing agent increases from $$Be$$ to $$Ba$$ as it can easily lose the valence shell electrons.
Question 3
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The element that does NOT form acidic oxide is :

A
carbon

B
phosphorus

C
chlorine

D
barium

Solution

The element that does NOT form acidic oxide is $$\displaystyle Barium$$.
$$\displaystyle Barium$$ is an alkaline earth metal. It forms basic oxide $$\displaystyle BaO$$.

$$\displaystyle Carbon $$ forms $$\displaystyle CO_2 $$ which is acidic oxide.

$$\displaystyle Phosphorus$$ forms $$\displaystyle P_2O_3$$ and $$\displaystyle P_2O_5$$ which are acidic oxides.

$$\displaystyle Chlorine$$ forms $$\displaystyle Cl_2O_7$$ and other oxides which are acidic oxides.
Question 4
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Thermal stability of $$BaCO_3, CaCO_3$$ and $$MgCO_3$$ is:

A
$$BaCO_3 > CaCO_3 > MgCO_3$$

B
$$BaCO_3 > MgCO_3 > CaCO_3$$

C
$$CaCO_3 > MgCO_3 > BaCO_3$$

D
$$MgCO_3 > CaCO_3 > BaCO_3$$

Solution

(i) More be the ionic nature, more be the attractive force between the species.
(ii) More be the attractive force, more be the thermal stability.
(iii) Ionic character for the same anionic species, increases down the group.
Thus, correct order of the thermal-stability is $$BaCO_3 > CaCO_3 > MgCO_3$$.
Question 5
1 / -0

Which one of the following alkali metals gives hydrated salts?

A
$$Li$$

B
$$Na$$

C
$$K$$

D
$$Cs$$

Solution

Among alkali metal ions, $${Li}^{+}$$ is the smallest which has the highest charge density. Therefore, it has the maximum degree of hydration than any other alkali metal cation.
Question 6
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The property of the alkaline earth metals which increases with their atomic number is:

A
ionisation energy

B
electronegativity

C
solubility of their hydroxides in water

D
solubility of their sulphates in water

Solution

Ionization energy decreases as the atomic number increases. It is because of an increase in atomic size due to addition of new shells and an increase in the magnitude of screening effect of the electrons in inner shells.

The electronegativities decreases as the atomic number increases.

The solubility of the alkaline earth metal hydroxides increases with increase in atomic number due to the decrease in lattice energy on moving down the group.

Hence, option $$C$$ is correct.
Question 7
1 / -0

A holoenzyme contains apoenzyme and ____________ .

A
isoenzyme

B
cofactor

C
inhibitor

D
none of the above

Solution

Holoenzyme = Apoenzyme+ Cofactor.
Apoenzyme:-An apoenzyme is an inactive enzyme, activation of the enzyme occurs upon binding of an organic or inorganic cofactor.
Cofactor:-A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's activity
Question 8
1 / -0

$${Li}_{2}{SO}_{4}$$ is not isomorphous with sodium sulphate, due to:

A
small size of lithium

B
high coordination number of lithium

C
high ionization energy of lithium

D
none of the above

Solution

Isomorphic compounds have same crystal structure at given temperature and conditions. While $$LiSO_4$$ and $$Na_2SO_4$$ are not isomorphous due to the exceptionally small size of Lithium (Li).
Question 9
1 / -0

The alkaline earth metal with the least density value is:

A
$$Mg$$

B
$$Be$$

C
$$Sr$$

D
$$Ca$$

E
$$Ba$$

Solution

The density of elements of $$IIA$$ group first decreases from $$Be$$ to $$Ca$$ and then steadily increases from $$Ca$$ to $$Ba$$. Thus, $$Ca$$ has the least density.
Question 10
1 / -0

Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

A
$$SrSO_4$$

B
$$CaSO_4$$

C
$$BeSO_4$$

D
$$BaSO_4$$

Solution

Hydration energy decreases down the group, whereas lattice energy remains almost constant.

Thus, hydration enthalpy is higher than the lattice enthalpy in case of $$BeSO_4$$ as the charge density in $$Be^{2+}$$ is high.

Hence,option $$C$$ is correct.

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The s-Block Elements Test 18

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The s-Block Elements Test 18

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SHARING IS CARING

Question 1

Be

Ne

Al

Cl

Solution

Question 2

decreases from $$Be$$ to $$Ba$$

increases from $$Be$$ to $$Ba$$

increases from $$Be$$ to $$Ca$$ and decreases from $$Ca$$ to $$Ba$$

decreases from $$Be$$ to $$Ca$$ and increases from $$Ca$$ to $$Ba$$

Solution

Question 3

carbon

phosphorus

chlorine

barium

Solution

Question 4

$$BaCO_3 > CaCO_3 > MgCO_3$$

$$BaCO_3 > MgCO_3 > CaCO_3$$

$$CaCO_3 > MgCO_3 > BaCO_3$$

$$MgCO_3 > CaCO_3 > BaCO_3$$

Solution

Question 5

$$Li$$

$$Na$$

$$K$$

$$Cs$$

Solution

Question 6

ionisation energy

electronegativity

solubility of their hydroxides in water

solubility of their sulphates in water

Solution

Question 7

isoenzyme

cofactor

inhibitor

none of the above

Solution

Question 8

small size of lithium

high coordination number of lithium

high ionization energy of lithium

none of the above

Solution

Question 9

$$Mg$$

$$Be$$

$$Sr$$

$$Ca$$

$$Ba$$

Solution

Question 10

$$SrSO_4$$

$$CaSO_4$$

$$BeSO_4$$

$$BaSO_4$$

Solution

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