251. To which class of compounds enzymes belong?
A) Proteins
(B) Phenols
(C) Alcohols
(D) None of the above
252. _ is a reduction reaction.
(A) Fe2+—>Fe3++e–
(B) Zn—>Zn2++2e–
(C) Na—>Na++1e–
D) Cl+1e–—>Cl–
253. Color of a concentrated solution of KMnO4 is?
(A) Green
(B) Golden
(C) Blue
D) Purple
254. KCl is soluble in?
(A) Benzene
(B) Ether
(C) Petrol
D) Water
255. What is the density of iron?
(A) 17.86 g cm-3
B) 7.86 g cm-3
(C) 27.86 g cm-3
(D) 2.70 g cm-3
256. The bond formed by the mutual sharing of electrons between the atoms is called:
(A) Ionic bond
B) Covalent bond
(C) Dative bond
(D) Electrovalent bond
257. An object appears lighter in water because one of the properties of matter is:
(A) Pressure
B) Buoyancy
(C) Surface Tension
(D) Viscosity
258. 44 a.m.u. of carbon dioxide is called its:
(A) Molar mass
(B) Molecular mass
C) Atomic mass
(D) Mass number
259. Einstein’s mass-energy equivalence is given by E = __.
(A) mv
B) mc^2
(C) mc
(D) mv^2
260. Charge of the electron is equivalent to:
(A) 1.6 x 10^-16 Coulomb
(B) 1.602 x 10^-17 Coulomb
(C) 1.67 x 10^-18 Coulomb
D) 1.602 x 10^-19 Coulomb
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