This set of Class 11 Chemistry Chapter 10 Multiple Choice Questions & Answers (MCQs) focuses on “s-Block Elements – Biological Importance of Sodium and Potassium”.
1. How much iron do you think a 70 kg man contains?
a) 4 gram
b) 3 gram
c) 5 gram
d) 2 gram
View Answer
Explanation: An ideal person, who is of 70 kg contains about 90 grams of sodium, 5 grams of iron, 170 grams of potassium and 0.06 grams of copper. We can say that there is a great biological importance of alkali metals.
2. Which of the following metal helps to transmit nerve signals?
a) hydrogen
b) potassium
c) sodium
d) lithium
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Explanation: Sodium, being an alkali metal has many biological uses like nerve signal transmission, also in water flow regulation across cell membranes along with the Sugars and amino acids’ transportation into cells.
3. Sodium and potassium have the same mobility in case of penetration into cell membranes.
a) true
b) false
View Answer
Explanation: Though potassium and sodium are similar chemically, they differ in their ability to penetrate the cell membrane and also in the mechanism of their transport. Potassium is more efficient in case of activating enzymes.
4. How much ATP does Sodium-Potassium pump consume?
a) three fourth
b) one fourth
c) one third
d) half
View Answer
Explanation: The Sodium-Potassium pump operates across cell membranes and consumes around one-third of the ATP used by a resting person. Sodium ion and potassium ions levels change within red blood cells because of the discriminatory mechanism called is the Sodium-Potassium pump.
5. Which elements compounds are used for treating disorders?
a) nitrogen
b) lithium
c) sodium
d) potassium
View Answer
Explanation: Lithium carbonate is a drug which is used to treat depressive disorders for Hypertension, lithium chloride is also used as a treatment. Lithium cannot be consumed directly because it has an effect on the body.
6. Which of the following is not treated using higher levels of potassium?
a) cold
b) hypokalemia
c) muscle contraction
d) respiratory paralysis
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Explanation: Muscle weakness, paralytic ileus, acidosis, ECG abnormal 38, inflammatory bowel diseases, respiratory paralysis, alkalosis, cardiac ahead, renal damage, muscle contraction, and hypokalemia are treated using higher levels of potassium.
7. Can potassium bicarbonate be used as an antacid?
a) Yes
b) No
c) Maybe
d) May not be
View Answer
Explanation: Potassium carbonate can be used instead of sodium carbonate as an antacid, in case if the person who has to consume antacid is restricted to consume sodium. This is because Sodium and potassium belong to the same group and have similar properties.
8. Francium has __________ biological importance.
a) great
b) no
c) extreme
d) huge
View Answer
Explanation: There is no biological importance of the alkali metal francium. Francium is a highly radioactive element and its chemical hazards are similar to those of cesium. Francium is not available to a significant extent in the biosphere.
9. Can cesium be ingested?
a) obviously
b) certainly
c) no
d) yes
View Answer
Explanation: No, cesium cannot be ingested, it should be avoided this is because the similarity of the isotopes of cesium present in the biosphere is very toxic and there ingestion can be dangerous and hazardous.
10. Which of the following metal readily reacts with skin moisture to form rubidium hydroxide?
a) lithium
b) rubidium
c) sodium
d) potassium
View Answer
Explanation: Rubidium accumulates in muscle ahead of potassium and it can stimulate metabolism. It also readily reacts with skin moisture in order to form rubidium hydroxide. This is the biological importance of the element rubidium.
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