Biological importance of sodium and potassium - class-VIII
| Description: biological importance of sodium and potassium | |
| Number of Questions: 17 | |
| Created by: Akash Patel | |
| Tags: elements of group 1 and group 2 element, compound and chemical reaction the s-block elements (alkali and alkaline earth metals) s-block elements chemistry the 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?
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Dilute hydrochloric acid
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Ethanol
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Sand
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Water spray
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:
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sodium and potassium are $6$th and $7$th most abundant element in the earth's crust
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$NaOH$ is hygroscopic in nature
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if a crystal of $NaOH$ is exposed to air for longer periods it potassium a white powder of $Na _{2}CO _{3}$
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lithium is an alkali metal and can be used in photoelectric cells
Which are involved in various physiological functional in animals?
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$Na^{+}$
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$K^{+}$
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Both (a) and (b)
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None of these
$Na^{+}$,$K^{+}$,$Mg^{+2}$ and $Ca^{+2}$ ions are concentrated in animals.
Potassium hydroxide is a good conductor of an electric current in the:
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gaseous state only
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molten (fused) state only
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solid state only
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solid and molten (fused) states
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molten (fused) state and in aqueous solution
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?
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Sodium
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Potassium
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Iron
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Silicon
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?
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Potassium
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Calcium
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Silicon
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none
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?
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400
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500
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600
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700
The daily requirement of sodium is $600 \ mg$.
What happens when too much of sodium is in your diet?
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Cancer
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Damage Nerve Function
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Risk factor for heart disease
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Digestion
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.
What is used in synthesis of chlorophyll In C4 plants?
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Sodium
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Iron
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Potassium
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Aluminium
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?
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4700
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14700
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20000
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30000
The minimum requirement of potassium per day for an adult is $4700\ mg$.
Which of the following ions participate in transmission of nerve signals?
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Sodium
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Potassium
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Magnesium
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Iron
Option $(A),\ (B)$ are correct.
Sodium ions helps in:
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transmission of nerve signals
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transport of sugar and amino acids into cells
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activation of different enzymes
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oxidation of glucose to produce ATP
Option $(A),\ (B)$ are correct.
A typical $70$ kg man constitutes $X$ kg of sodium and $Y$ kg of potassium?
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$x=90,\ y=70$
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$x=90,\ y=170$
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$x=70,\ y=90$
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$x=170,\ y=90$
Option $(B)$ is correct.
Sodium ions are found in:
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outside of cells
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blood plasma
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interstitial fluids
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within cell fluids
Which element is present in blood plasma in larger quantity?
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Sodium
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Potassium
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Iron
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Copper
Which of the following element participate in oxidation of glucose to form ATP?
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Calcium
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Sodium
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Magnesium
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Potassium
Select the correct statement with respect to sodium peroxide?
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It decolourises the $KMnO _4$ solution.
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On heating with oxygen at $450^0C$ and 300 atm pressure, it becomes paramagnetic.
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It is obtained along with sodium metal when sodium oxide is heated to a temperature more than $400^oC$.
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It gives both hydrogen peroxide and oxygen gas with water as well as with sulphuric acid.
(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 $H _2O _2$.