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

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

Sodium ions are found in:

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

  1. outside of cells

  2. blood plasma

  3. interstitial fluids

  4. within cell fluids

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Correct Option: A,B,C,D

Which element is present in blood plasma in larger quantity?

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

  1. Sodium

  2. Potassium

  3. Iron

  4. Copper

Show answer
Correct Option: A
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.

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

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

  1. Calcium

  2. Sodium

  3. Magnesium

  4. Potassium

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Correct Option: D
Explanation:
Option $(D)$ is correct.
Potassium participates in the oxidation of glucose to form ATP through  ATP-sensitive potassium channel. 

Select the correct statement with respect to sodium peroxide?

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

  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.

Show answer
Correct Option: A,B,C
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 $H _2O _2$.

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

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

  1. $ H _ { 2 } $

  2. $ \mathrm { CO } _ { 2 } $

  3. $ ^ { 14 } \mathrm { CO } _ { 2 } $

  4. $ \mathrm { NO } _ { 2 } $

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Correct Option: B

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

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

  1. True

  2. False

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Correct Option: A
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.

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

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

  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

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Correct Option: C

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

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

  1. $Mg^{2+}$

  2. $Na^{+}$

  3. $K^{+}$

  4. $Ca^{2+}$

Show answer
Correct Option: D
Explanation:

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

Which of the following enzymes contain $Mg^{2+}$
ions?


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

  1. Phosphohydrylase

  2. Zymase

  3. Phosphotransferase

  4. 1 and 3

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Correct Option: D
Explanation:

$Mg^{2+}$ ions are present in enzymes phosphohydrylase and phosphotransferase.

Which of the following statements is false ?

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

  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.

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Correct Option: C