241. Which of the following is an organic compound ?
(A) CO
(B) C₂H₂
(C) CO₂
(D) NaHCO₃

242. Which one of the following is the general formula of alkenes?
(A) C_nH_2n
(B) C_nH_2n–1
(C) C_nH_2n+1
(D) C_nH_n

243. The Homologues has the same
(A) density
(B) state
(C) chemical properties
(D) colour

244.  Mutation is a sudden chemical change in

(A) DNA
(B) RNA
(C) Cell
(D) Cell wall

245. Amino acids are the building blocks of
(A) Fats
(B) Vitamins
(C) Proteins
(D) Lipids

246. Organic chemistry is the study of
(A) Carbon
(B) Metal
(C) Oxygen
(D) Carbon and its compounds

247. Enzymes are made of
(A) Proteins
(B) Lipids
(C) Fats
(D) Minerals

248. Acidic rain is caused by
(A) Nitrogen oxide
(B) Sulfur Dioxide
(C) Carbonic Acid
(D) Both (A) and (B)

249. The blister form of copper is the _________ form.
(A) Impure
(B) Raw
(C) Pure
(D) Refined.

250.  Vitamin A is soluble in
(A) Water
(B) Fats
(C) Both A & B
(D) None of these