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When NH₃ accepts a proton (H⁺), it forms NH₄⁺ (ammonium), its conjugate acid. NH₂⁻ (A) would be the conjugate base, not acid. NO₂⁻ and H₂O are unrelated. DAT chemistry frequently tests Brønsted-Lowry conjugate acid–base pairs.

Vitamin B12 deficiency impairs red blood cell maturation, leading to pernicious anemia. B1 deficiency causes beriberi, B6 affects neurotransmitter synthesis, and C causes scurvy. DAT biology emphasizes vitamin-linked diseases.

Tollens’ reagent ([Ag(NH₃)₂]⁺) oxidizes aldehydes to carboxylates while reducing Ag⁺ to metallic silver, producing the “silver mirror test.” Ketones typically do not react (except α-hydroxy ketones). 2,4-DNP (A) reacts with both aldehydes and ketones, forming hydrazones. Benedict’s solution (C) detects reducing sugars (aldehydes, some ketones like fructose), not distinguishing strictly. Bromine water (D) tests for unsaturation. Therefore, Tollens’ test specifically differentiates aldehydes vs ketones. DAT organic often includes simple diagnostic tests.

NH₃ forms hydrogen bonds due to N–H bonds and nitrogen’s high electronegativity. CH₄ and CCl₄ are nonpolar, CO₂ is linear and nonpolar. DAT chemistry often tests intermolecular force ranking.

Rearrange: 3x−7=2x+53x - 7 = 2x + 5. Subtract 2x2x: x−7=5x - 7 = 5. Add 7: x=12x = 12. Correct answer = D. This is a straightforward linear equation, but errors often occur when moving terms. On DAT QR, speed and accuracy in solving simple algebra are essential, as many problems build on these fundamentals.