The s-Block Elements Test 17

Result

The s-Block Elements Test 17

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 metal plays an important role in neuromuscular functions, interneuronal transmissions, cell membrane integrity and blood coagulation?

A
Be

B
Mg

C
Ca

D
Ba

Solution

Calcium plays an important role in neuromuscular functions, interneuronal transmissions, cell membrane integrity and blood coagulation.
Question 2
1 / -0

Which element has highest concentration in RBC?

A
Iron

B
Potassium

C
Sodium

D
Copper

Solution

RBCs contain hemoglobin which is red in colour due to presence of Iron
Question 3
1 / -0

Among the following compound, the thermal stability is least in:

A
$${K}_{2}C{O}_{3}$$

B
$${Na}_{2}C{O}_{3}$$

C
$$BaC{O}_{3}$$

D
$${Li}_{2}C{O}_{3}$$

Solution

Lithium carbonate $$\displaystyle Li_2CO_3$$ is least thermally stable.
Replacement of the larger carbonate ion by a smaller oxide ion leads to increased lattice energy thus favors decomposition. Also, strong polarizing action of small $$\displaystyle Li^+$$ ion distorts the electron cloud on the nearby oxygen atom of the large carbonate ion to such an extent that the C-O bond gets weakened and Li-O bond becomes stronger which ultimately leads to the decomposition of carbonate to oxide and carbon dioxide.
$$\displaystyle Li_2CO_3 \xrightarrow {\Delta} Li_2O+ CO_2$$
Question 4
1 / -0

Which element is present in blood plasma in larger quantity?

A
Sodium

B
Potassium

C
Iron

D
Copper

Solution

Option $$ (A) $$ is correct.
Sodium is present in blood plasma in larger quantity. It is present in extracellular fluid and interstitial fluids.
Hence, even though sodium diffuses into the cell due to the concentration gradient, there is a sodium pump which pushes it back again.
Question 5
1 / -0

Which among the following is completely soluble in water?

A
$$NaF$$

B
$$MgF$$

C
$$LiF$$

D
$$Mg_3(PO_4)_2$$

Solution

Fluorides and phosphates of $$Li$$ and $$Mg$$ are sparingly soluble in water whereas those of other alkali metals are soluble in water.
Question 6
1 / -0

Fluorides and phosphates of alkali metals are:

A
completely soluble in water

B
sparingly soluble in water

C
completely soluble in water except $$Li$$ and $$Mg$$

D
completely insoluble in water except $$Li$$ and $$Mg$$

Solution

Fluorides, phosphates of $$Li$$ and $$Mg$$ are sparingly soluble in water whereas those of other alkali metals are soluble in water.
Question 7
1 / -0

Lithium and magnesium combines with carbon on heating to form:

A
carbonates

B
carbides

C
bicarbonates

D
no such combination takes place

Solution

Both $$Li$$ and $$Mg$$ combine with carbon on heating to form carbides.
$$2Li + 2C \longrightarrow Li_2C_2$$
$$Mg + 2C \longrightarrow MgC_2$$
Question 8
1 / -0

A metal carbonate,$$M_xCO_3$$, is heated in a closed container and the product is passed through lime water and lime water turns milky.The metal $$M$$ can be:

A
$$Ba$$

B
$$Mg$$

C
$$Na$$

D
$$K$$

Solution

Carbonates of $$Li$$ and $$Mg$$ decompose on heating and liberate $$CO_2$$ Carbonates of other alkali metals are stable towards heat and decomposed only by fusion. $$CO_2$$ turns lime water milky.
Question 9
1 / -0

Which of the following will be sparingly soluble in water?

A
$$Ca_3(PO_4)_2$$

B
$$CaF_2$$

C
$$Mg_3(PO_4)2$$

D
$$NaF$$

Solution

Fluorides and phosphates of $$Li$$ and $$Mg$$ are sparingly soluble in water whereas those of other alkali metals are soluble in water.
Question 10
1 / -0

Which mineral is neccessary for blood clotting?

A
Calcium

B
Magnese

C
Phosphorus

D
Iron

Solution

Calcium plays an important role in the coagulation of blood (blood clotting). An increased concentration of calcium in the platelets helps in activating various proteins important for blood clotting and thus, results in the formation of a blood clot. It helps in the binding of clotting enzymes to phospholipids in platelets and tissue and accelerates the reaction.

So, the correct answer is option $$A$$.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

The s-Block Elements Test 17

Result

The s-Block Elements Test 17

Score

-

Rank

-

SHARING IS CARING

Question 1

Be

Mg

Ca

Ba

Solution

Question 2

Iron

Potassium

Sodium

Copper

Solution

Question 3

$${K}_{2}C{O}_{3}$$

$${Na}_{2}C{O}_{3}$$

$$BaC{O}_{3}$$

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

Solution

Question 4

Sodium

Potassium

Iron

Copper

Solution

Question 5

$$NaF$$

$$MgF$$

$$LiF$$

$$Mg_3(PO_4)_2$$

Solution

Question 6

completely soluble in water

sparingly soluble in water

completely soluble in water except $$Li$$ and $$Mg$$

completely insoluble in water except $$Li$$ and $$Mg$$

Solution

Question 7

carbonates

carbides

bicarbonates

no such combination takes place

Solution

Question 8

$$Ba$$

$$Mg$$

$$Na$$

$$K$$

Solution

Question 9

$$Ca_3(PO_4)_2$$

$$CaF_2$$

$$Mg_3(PO_4)2$$

$$NaF$$

Solution

Question 10

Calcium

Magnese

Phosphorus

Iron

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.