Chemistry MCQS

291. In which of the following does a Zwitterion exist?
A. Glycine HCL
B. Alanine
C. Both A & B
D. None of the above

292. A reaction in which a substance burns in Oxygen to produce heat and flame is called:
A. Combustion
B. Decomposition
C. Displacement
D. Combination

293. The average mass number of all naturally found isotopes of an element is called:
A. Atomic mass
B. Atomic mass unit
C. Formula mass
D. Mass number

294. In water (H2O) the ratio by mass between Hydrogen and Oxygen is:
A. 1:8
B. 1:16
C. 3:4
D. 3:8

295. The study of Hydro Carbons and their derivatives is called:
A. Organic Chemistry
B. Physical Chemistry
C. Inorganic Chemistry
D. Bio Chemistry

296. __ is the best disinfectant:
A. Bromine
B. Fluorine
C. Chlorine
D. Iodine

297. If the concentration of reactants is increased, the equilibrium will shift to the:
a) Reactants
b) Products
c) No change in equilibrium position
d) Both reactants and products in equal amounts

298. The equilibrium constant (Kc) for the reaction: CO + H2O ⇌ CO2 + H2 is:
a) [CO2] × [H2] / [CO] × [H2O]
b) [CO2] × [H2O] / [CO] × [H2]
c) [CO] × [H2] / [CO2] × [H2O]
d) [CO] × [H2O] / [CO2] × [H2]

299. Which of the following statements is true for a system at equilibrium?
a) The concentrations of reactants and products are equal.
b) The concentrations of reactants and products are constant.
c) The concentrations of reactants and products are zero.
d) The concentrations of reactants are greater than products.

300. The equilibrium constant (Kc) for the reaction: 2SO2 + O2 ⇌ 2SO3 is:
a) [SO3]^2 / [SO2] × [O2]
b) [SO2] × [O2] / [SO3]^2
c) [SO3] × [SO2] / [O2]^2
d) [SO2] × [O2]^2 / [SO3]