Tag: the s-block elements (alkali and alkaline earth metals)

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Questions Related to the s-block elements (alkali and alkaline earth metals)

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

Which element is present in blood plasma in larger quantity?

  1. Sodium

  2. Potassium

  3. Iron

  4. Copper
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
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.
Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

Which of the following element participate in oxidation of glucose to form ATP?

  1. Calcium

  2. Sodium

  3. Magnesium

  4. Potassium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Option $(D)$ is correct.
Potassium participates in the oxidation of glucose to form ATP through  ATP-sensitive potassium channel. 
Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

Select the correct statement with respect to sodium peroxide?

  1. It decolourises the $KMnO _4$ solution.
  2. On heating with oxygen at $450^0C$ and 300 atm pressure, it becomes paramagnetic.
  3. It is obtained along with sodium metal when sodium oxide is heated to a temperature more than $400^oC$.

  4. It gives both hydrogen peroxide and oxygen gas with water as well as with sulphuric acid.
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

(A) $2Mn{ O } _4^-(pink)+16H^++5O _2^{2-}\rightarrow 2Mn^{2+}+8H _2O+5O _2$.
(B) $Na _2O _2+O _2\xrightarrow [300 atm]{> 450^oC} 2NaO _2 ({ O } _2^-$ contains on unpaired electron in $\pi^*$ MO).
(C) $2Na _2O\xrightarrow {400^oC} Na _2O _2+2Na$.
(D) Gives only $H _2O _2$.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) common salt some useful compounds in everyday life salts and their properties

When picric acid is treated with aqueous sodium bicarbonate $ \left( \mathrm { NaH }  ^{ 14 } \mathrm { CO } _ { 3 } \right) $, a gas is liberated with effervescence. The gas evolved would be

  1. $ H _ { 2 } $
  2. $ \mathrm { CO } _ { 2 } $
  3. $ ^ { 14 } \mathrm { CO } _ { 2 } $
  4. $ \mathrm { NO } _ { 2 } $
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) common salt some useful compounds in everyday life salts and their properties

Effervescence is seen when a bottle of soda water is opened.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The liquid in the soda bottle is under high pressure. When you open the bottle, the dissolved carbon dioxide is depressurized and wants to rapidly expand. Thus effervescence is seen when a bottle of soda is opened.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements

Select the  correct statement about $Mg^{2+}$   ions : 

  1. These ions are concentrated more in intracelluar then in extracellular fluids in animal bodies

  2. Activation of phosphate transfer enzyme takes place in their presencde

  3. They are involved in carbohydrate metablism

  4. All are correct statement
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Magnesium ions (Mg2+) act as essential cofactors for many enzymes, including those involved in carbohydrate metabolism and ATP-related reactions. Option A is incorrect because Mg2+ is primarily extracellular in concentration, and B is a specific enzymatic function that is less comprehensive than the metabolic role described in C.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements biological importance of sodium and potassium

The ion helpful for controlling heart beating and muscle contraction is:

  1. $Mg^{2+}$
  2. $Na^{+}$
  3. $K^{+}$
  4. $Ca^{2+}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

${ Ca }^{ 2+ }$ is the ion helpful for controlling heart beat and muscle contraction.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements biological importance of sodium and potassium

Which of the following statements is false ?

  1. ${\text{M}}{{\text{g}}^{{\text{2 + }}}}$ ion form a complex with ATP
  2. ${\text{C}}{{\text{a}}^{{\text{2 + }}}}$ on are important in blood clotting
  3. ${\text{C}}{{\text{a}}^{{\text{2 + }}}}$ ion are not important in maintaining the regular beating of the heart.
  4. ${\text{M}}{{\text{g}}^{{\text{2 + }}}}$ ion are important in the green parts of plants.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Calcium ions (Ca2+) are crucial for muscle contraction, including the rhythmic contraction of cardiac muscle (heartbeat). Therefore, the statement that they are not important in maintaining the regular beating of the heart is false.