Synthetic detergents (like alkyl sulfates or sulfonates) form soluble calcium and magnesium salts, so they lather well even in hard water. Soaps form scum. Detergents are usually derived from petrochemicals, can be non-biodegradable if branched, and may cause pollution.
Assertion (A): Leguminous plants do not require nitrogenous fertilizers. Reason (R): They have Rhizobium bacteria in their root nodules that fix atmospheric nitrogen.
A.A is false but R is true.
B.Both A and R are true and R is the correct explanation of A.
C.A is true but R is false.
D.Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Leguminous plants (like peas, beans) have a symbiotic relationship with Rhizobium bacteria in their root nodules. These bacteria convert atmospheric Nâ‚‚ into usable nitrogen compounds, fulfilling the plant's nitrogen needs. Thus, they generally do not need external nitrogenous fertilizers. Both statements are correct and R explains A.
Explanation:
Baking powder is a mixture of sodium bicarbonate (baking soda) and a mild edible acid, usually tartaric acid. When moistened and heated, they react to release COâ‚‚, causing dough to rise. Baking soda alone requires an external acidic ingredient. The acid ensures complete reaction and avoids a bitter taste.
Explanation:
Cobalt-60 is a radioactive isotope that emits strong gamma radiation. It is widely used in radiotherapy to treat various types of cancers, including blood cancers like leukemia. Iodine-131 is used for thyroid disorders, Carbon-14 for radiocarbon dating, and Sodium-24 for detecting blood clots.
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