Tag: biological importance of elements

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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

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?

  1. Dilute hydrochloric acid

  2. Ethanol

  3. Sand

  4. Water spray
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Select the incorrect statement:

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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
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 are involved in various physiological functional in animals?

  1. $Na^{+}$
  2. $K^{+}$

  3. Both (a) and (b)

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

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

  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
Reveal answer Fill a bubble to check yourself
E Correct answer
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.

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

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

  1. Sodium

  2. Potassium

  3. Iron

  4. Silicon
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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 has high concentration in plants, as compared to sodium?

  1. Potassium

  2. Calcium

  3. Silicon

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
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 .

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

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

  1. Cancer

  2. Damage Nerve Function

  3. Risk factor for heart disease

  4. Digestion
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

What is used in synthesis of chlorophyll In C4 plants?

  1. Sodium

  2. Iron

  3. Potassium

  4. Aluminium
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. 4700

  2. 14700

  3. 20000

  4. 30000
Reveal answer Fill a bubble to check yourself
A Correct answer
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.