The s-Block Elements Test 47

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The s-Block Elements Test 47

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following compound is used in gun powder?

A
$$LiNO_{3}$$

B
$$NaNO_{3}$$

C
$$Pb(NO_{3})_{2}$$

D
$$KNO_{3}$$

Solution
Question 2
1 / -0

Sodium is heated in air at $$350^oC$$ to form $$X, X$$ absorbs $$CO_2$$ and forms sodium carbonate and $$Y$$. Which of the following is $$Y$$?

A
$$H_2$$

B
$$O_2$$

C
$$H_2O_2$$

D
$$O_3$$

Solution
Question 3
1 / -0

Beryllium and aluminium exhibit many properties that are similar. But the two element differ in:

A
Forming covalent halides

B
Forming polymeric hydrides

C
Exhibiting maximum covalency in compounds

D
Exhibiting amphoteric nature in their oxides

Solution
Question 4
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Pick out statement (s) which is (are) not true about the diagonal relationship of $$Li$$ and $$Mg$$:
$$A.$$ Polarising powers of $$Li^{+}$$ and $$Mg^{2+}$$ ions are almost same.
$$B.$$ Like $$Li, Mg$$ decomposes water very fast.
$$C.$$ $$LiCl$$ and $$MgCl_{2}$$ are deliquescent.
$$D.$$ Like $$Li, Mg$$ readily reacts with liquid bromine at ordinary temperature.

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

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

C
Only $$B$$

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

Solution
Question 5
1 / -0

The correct order if mobility of alkali metal ions in aqueous solution is:

A
$$K^{+}>Rb^{+}>Na^{+}>Li^{+}$$

B
$$Rb^{+}>K^{+}>Na^{+}>Li^{+}$$

C
$$Li^{+}>Na^{+}>K^{+}>Rb^{+}$$

D
$$Na^{+}>K^{+}>Rb^{+}>Li^{+}$$

Solution
Question 6
1 / -0

Match the compounds given in $$(X)$$ with their uses in $$(Y)$$

$$X$$ $$Y$$
A. $$NaOH$$ 1. Glass
B. $$Na_{2}S_{2}O_{3}$$ 2. Germicide
C. $$NaCN$$ 3. Antichlor
D. $$Na_{2}CO_{3}$$ 4. Soap

A
$$A (4), B(3), C(2), D(1)$$

B
$$A (3), B (4), C(1), D(2)$$

C
$$A(2), B(3), C(4), D(1)$$

D
$$A(1), B(2), C(3), D(4)$$

Solution

$$NaOH$$ is caustic soda, used in soap industries for saponification
$$Na_2S_2O_3$$ (Sodium thiosulphate) is used as antichlor. Antichlor is used in bleaching of chlorine compounds.It is chemical that reacts with, any free chlorine or hypochlorite and neutralizes.
$$NaCN$$ (Sodium Cyanide) is used in soaps as a germicide.it kill the harmfull microbes.
$$Na_2CO_3$$ Sodium Carbonate is used in reduction of melting point of silica in the glass industries
Thus Correct option is A
Question 7
1 / -0

Which of the following does not illustrate the anomalous behaviour of lithium?

A
Lithium reacts with nitrogen to form a nitride

B
Lithium is the hardest alkali metal

C
Lithium reacts with oxygen to form normal oxide only

D
Lithium carbonate decomposes on heating

Solution
Question 8
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Consider the cations, $$Li^+, Be^{2+}, K^+ $$ and $$Al^{3+}$$. The largest and the smallest ions from this list are respectively:

A
$$K^+$$ and $$Li^+$$

B
$$Al^{3+}$$ and $$Be^{2+}$$

C
$$Mg^{2+}$$ and $$Li^+$$

D
$$K^+$$ and $$Be^{2+}$$

Solution
Question 9
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The set representing the correct order of ionic radius is:

A
$$ Li^+ > Be^{2+} > Na^{+} > Mg^{2+} $$

B
$$ Na^+ > Li^+ > Mg^{2+} > Be^{2+} $$

C
$$ Li^+ > Na^+ > Mg^{2+ } > Be^{2+} $$

D
$$ Mg^{2+} > Be^{2+} > Li^+ > Na^+$$

Solution

Answer B. Na+>Li+>Mg2+>Be2+

Sodium ion has a larger size than lithium because it has one extra shell than lithium and consequently its size will be greater than lithium.
Now, lithium has a larger size than magnesium because more the charge on an ion lesser will be its size. Also, Mg has a larger size than beryllium because of the presence of extra shell compared to beryllium. Or we can say in other words, more the charge on an ion lesser will be its size due to the increase in effective nuclear charge after the loss of electrons.
The effective nuclear charge will be greater in the ion which has lose more electrons.
Question 10
1 / -0

Which among the following is least soluble in water?

A
$$NaF$$

B
$$LiF$$

C
$$KF$$

D
$$RbF$$

Solution