The s-Block Elements Test 25

Result

The s-Block Elements Test 25

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following in creasing order is NOT correct as per the property indicate against it?

A
$$CsCl < RbCl < KCl < NaCl < LiCl$$ (Lattice energy)

B
$$LiOH < NaOH < KOH$$ (Solubility in water)

C
$${Li^ + } < N{a^ + } < {K^ + } < R{b^ + } < C{s^ + }$$ (Size of hydrated ion)

D
$$NaI < NaBr < NaCl < NaF$$ (Lattice energy)
Question 2
1 / -0

Zn and Cd metals do not show variable valency because:

A
They have only two electrons in the outermost subshells

B
Their d-subshells are completely filled

C
Their d-subshells are partially filled

D
They are relatively soft metals

Solution

we can conclude that zinc and mercury do not show variable valency like d-block elements because their d-shells are complete and They have only two electrons in the outermost subshells
Question 3
1 / -0

Which of the following on heating gives oxides quickly ?

A
$${ Na }_{ 2 }{ CO }_{ 3 }$$

B
$${ K }_{ 2 }{ CO }_{ 3 }$$

C
$${ Li }_{ 2 }{ CO }_{ 3 }$$

D
$${ Rb }_{ 2 }{ CO }_{ 3 }$$

Solution

$$N{a_2}C{O_3} \to state\,\,than\,\,L{i_2}C{O_3}$$
$${K_2}C{O_3}$$ and $$R{b_2}C{O_3}$$
Stablitiy of carbaonate $$ \uparrow $$ down the gap or size $$ \uparrow CO_3^{2 - } $$ more stable.
$$L{i_2}C{o_3} \to L{i_2}O + C{o_2}$$.
Hence, option $$C$$ is correct answer.
Question 4
1 / -0

Beryllium hydroxide on reaction with acid forms

A
hydrated $$Be(NO_3)_2$$

B
anhydrous $$Be(NO_3)_2$$

C
$$\left[ { Be }_{ 4 }O({ NO }_{ 3 }{ ) }_{ 6 } \right] $$

D
None of these

Solution
Question 5
1 / -0

In aqueous solution beryllium sulphate exist as:

A
$$[Be(H_2O)_4]SO_4$$

B
$$[Be(H_2O)_6]SO_4$$

C
$$[Be(H_2O)_3]SO_4$$

D
$$[Be(H_2O)_5]SO_4$$

Solution
Question 6
1 / -0

Which of the following properties is not true for an alkali metal?

A
Low atomic volume

B
Low ionization energy

C
Low density

D
Low electronegativity

Solution

They possess highest atomic volume in their respective periods because of weak force of attraction on the valence shell electron.
Question 7
1 / -0

The correct sequence of increasing melting point of $$BeCl_{2},MgCl_{2},CaCl_{2},SrCl_{2}$$ and $$BaCl_{2}$$ is

A
$$BaCl_{2} < SrCl_{2} < CaCl_{2} < MgCl_{2} < BeCl_{2}$$

B
$$BeCl_{2} < MgCl_{2} < CaCl_{2} < SrCl_{2} < BaCl_{2}$$

C
$$BeCl_{2} < CaCl_{2} < MgCl_{2} < SrCl_{2} < BaCl_{2}$$

D
$$MgCl_{2} < BeCl_{2} < SrCl_{2} < CaCl_{2} < BaCl_{2}$$

Solution

Ionic character depends upon, electronegativity difference between cation and anion of the compound. As these difference increases, the ionic character increases. The larger the size of cation and the smaller the size of anion, the more is the electronegativity difference and the more is the ionic character. as here anion is same and sequence of the size of the cation is $$Be^{2+}<Mg^{2+}<Ca^{2+}<Sr^{2+}<Ba^{2+}$$

So the correct order of M.P is as follows: $$BeCl_2<MgCl_2<CaCl_2<SrCl_2<BaCl_2$$ Hence, option B is correct
Question 8
1 / -0

$$LiAlH_4$$ is obtained by reacting an excess of _____ with an ethereal solution of $$AlCl_3$$:

A
$$LiCl$$

B
$$LiH$$

C
$$Li$$

D
$$LiOH$$

Solution

The reaction is ,

$$4LiH + AlCl_3 \rightarrow LiAlH_4 + 3 LiCl$$

by reacting $$LiH$$ in the presence of dry ether with $$AlCl_3$$ .
Question 9
1 / -0

Excess of $$Na^+$$ ions in human system causes

A
High blood pressure

B
anaemia

C
Low blood pressure

D
None of these

Solution

Excess of $$Na^+$$ ion causes hight B.P
Question 10
1 / -0

Lithium selenide can be described as a cubic closest-packed array of selenide ions with lithium ions in all of the tetrahedral holes. Formula of lithium selenide is

A
$$L{i_2}Se$$

B
$$LiSe$$

C
$$LiS{e_2}$$

D
$$L{i_3}Se$$

Solution

Answer(A):- $$Li_2Se$$
If number of Se =Z , Number of Li = 2Z

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

The s-Block Elements Test 25

Result

The s-Block Elements Test 25

Score

-

Rank

-

SHARING IS CARING

Question 1

$$CsCl < RbCl < KCl < NaCl < LiCl$$ (Lattice energy)

$$LiOH < NaOH < KOH$$ (Solubility in water)

$${Li^ + } < N{a^ + } < {K^ + } < R{b^ + } < C{s^ + }$$ (Size of hydrated ion)

$$NaI < NaBr < NaCl < NaF$$ (Lattice energy)

Question 2

They have only two electrons in the outermost subshells

Their d-subshells are completely filled

Their d-subshells are partially filled

They are relatively soft metals

Solution

Question 3

$${ Na }_{ 2 }{ CO }_{ 3 }$$

$${ K }_{ 2 }{ CO }_{ 3 }$$

$${ Li }_{ 2 }{ CO }_{ 3 }$$

$${ Rb }_{ 2 }{ CO }_{ 3 }$$

Solution

Question 4

hydrated $$Be(NO_3)_2$$

anhydrous $$Be(NO_3)_2$$

$$\left[ { Be }_{ 4 }O({ NO }_{ 3 }{ ) }_{ 6 } \right] $$

None of these

Solution

Question 5

$$[Be(H_2O)_4]SO_4$$

$$[Be(H_2O)_6]SO_4$$

$$[Be(H_2O)_3]SO_4$$

$$[Be(H_2O)_5]SO_4$$

Solution

Question 6

Low atomic volume

Low ionization energy

Low density

Low electronegativity

Solution

Question 7

$$BaCl_{2} < SrCl_{2} < CaCl_{2} < MgCl_{2} < BeCl_{2}$$

$$BeCl_{2} < MgCl_{2} < CaCl_{2} < SrCl_{2} < BaCl_{2}$$

$$BeCl_{2} < CaCl_{2} < MgCl_{2} < SrCl_{2} < BaCl_{2}$$

$$MgCl_{2} < BeCl_{2} < SrCl_{2} < CaCl_{2} < BaCl_{2}$$

Solution

Question 8

$$LiCl$$

$$LiH$$

$$Li$$

$$LiOH$$

Solution

Question 9

High blood pressure

anaemia

Low blood pressure

None of these

Solution

Question 10

$$L{i_2}Se$$

$$LiSe$$

$$LiS{e_2}$$

$$L{i_3}Se$$

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.