Tag: biological importance of elements

Questions Related to biological importance of elements

When dealing with a spillage of metallic sodium it is important that no toxic or flammable products are formed.
Which material should be used if there is a spillage of metallic sodium?

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

  1. Dilute hydrochloric acid

  2. Ethanol

  3. Sand

  4. Water spray

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Correct Option: C
Explanation:

Sand can be used if there is a spillage of metallic sodium as sand will have no reaction with sodium metal and it serves as a coating to protect sodium from any reaction.

Select the incorrect statement:

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

  1. sodium and potassium are $6$th and $7$th most abundant element in the earth's crust

  2. $NaOH$ is hygroscopic in nature

  3. if a crystal of $NaOH$ is exposed to air for longer periods it potassium a white powder of $Na _{2}CO _{3}$

  4. lithium is an alkali metal and can be used in photoelectric cells

Show answer
Correct Option: D
Explanation:
Among alkali metals, cesium has lowest ionisation enthalpy and hence it can show photoelectric effect to the maximum extent and therefore preffered in photoelectric cell. The alkali metal widely used in photoelectric cell is Cs
Alkali metals have lower ionisation energy than their counterparts and hence havemhigher chance of emitting electrons, when  a radiation falls on them. So they are used in photoelectric cells so that they easily emit electron when energy containing photons in sunlight strikes them.
Hence option D is incorrect statement

Which are involved in various physiological functional in animals?

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. $Na^{+}$

  2. $K^{+}$

  3. Both (a) and (b)

  4. None of these

Show answer
Correct Option: C
Explanation:

$Na^{+}$,$K^{+}$,$Mg^{+2}$ and $Ca^{+2}$ ions are concentrated in animals.

Potassium hydroxide is a good conductor of an electric current in the:

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. gaseous state only

  2. molten (fused) state only

  3. solid state only

  4. solid and molten (fused) states

  5. molten (fused) state and in aqueous solution

Show answer
Correct Option: E
Explanation:

Option $(E)$ is correct.

Potassium hydroxide is a good conductor of an electric current in the molten (fused) state and in aqueous solution. When it is in solid state it cannot conduct electricity but it can conduct electricity in aqueous solution state or molten state. This is because it is an ionic compound. Ionic compounds are made of charged ions which are held tightly in solid state but become mobile in molten or aqueous solution state. The movement of these mobile ions between electrodes helps in conducting electricity.

A severe shortage of what in body fluids, may cause a potentially fatal condition known as hypokalemia?

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. Silicon

Show answer
Correct Option: B
Explanation:

Hypokalemia is when blood's potassium levels are too low. Potassium is an important electrolyte for nerve and muscle cell functioning, especially for muscle cells in the heart. Your kidneys control your body's potassium levels, allowing for excess potassium to leave the body through urine or sweat.

Which element has high concentration in plants, as compared to sodium?

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. Potassium

  2. Calcium

  3. Silicon

  4. none

Show answer
Correct Option: A
Explanation:

Plants need a small amount but high concentration of K for specific functions in the cytoplasmand a major portion (∼90%) of it is localized in vacuoles, where it acts as an osmoticum. Maintenance can be achieved by other cation like sodium too .

What is requirement for sodium in milligrams per day?

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. 400

  2. 500

  3. 600

  4. 700

Show answer
Correct Option: C
Explanation:

The daily requirement of sodium is $600 \ mg$.

What happens when too much of sodium is in your diet?

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. Cancer

  2. Damage Nerve Function

  3. Risk factor for heart disease

  4. Digestion

Show answer
Correct Option: C
Explanation:

As sodium accumulates, the body holds onto water to dilute the sodium. This increases both the amount of fluid surrounding cells and the volume of blood in the bloodstream. Increased blood volume means more work for the heart and more pressure on blood vessels. Over time, the extra work and pressure can stiffen blood vessels, leading to high blood pressure, heart attack, and stroke. It can also lead to heart failure.


Thus, too much sodium in our diet increases the risk factor for heart related diseases.

What is used in synthesis of chlorophyll In C4 plants?

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. Iron

  3. Potassium

  4. Aluminium

Show answer
Correct Option: A
Explanation:

In C4 plants, sodium is a micronutrient that aids in metabolism, specifically in regeneration of phosphoenolpyruvate (involved in the biosynthesis of various aromatic compounds, and in carbon fixation) and synthesis of chlorophyll.

What is minimum requirement (in milligram) of potassium per day for adult?

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. 4700

  2. 14700

  3. 20000

  4. 30000

Show answer
Correct Option: A
Explanation:

The minimum requirement of potassium per day for an adult is $4700\ mg$.


Potassium is very important in cellular biochemical reactions and energy metabolism.

Along with sodium, it regulates the water balance and the acid-base balance in the blood and tissues.

Thus, potassium is a very important mineral for our body.