271. Nucleic acids are of ________types.
(A) Two
(B) Three
(C) Four
(D) Five

272. The two types of nucleic acids are DNA and
(A) GNA
(B) RNA
(C) proteins
(D)  lipids

273. Fats and oils are example of ?
(A) Proteins
(B) Vitamin
(C) Lipids
(D) Carbohydrates

274. NH₃ is a/an
(A) Acid
(B) Base
(C) Salts
(D) Neutral

275. Salts are
(A) Acid
(B) Base
(C) Alkalies
(D) Neutral

276. Organic compounds are originated from ?
(A) Air
(B) Sun
(C) Rocks
(D) Living organisms

277. ___________are insoluble in water.
(A) Alkanes
(B) Sugars
(C) Salts
(D) Starch

278. Poly Hydroxyl compounds of Aldehyde and ketones are called ?
(A) Carbohydrates
(B) Protein
(C) Lipids
(D) Vitamin

279. The concept of ensemble was introduced by____________?
A. Boltzmann
B. Gibbs
C. Carnot
D. Mexwell

280. Which molecule have stronger London dispersion forces?
A. Hydrogen gas
B. Water
C. Bromine
D. Hydrochloric acid