Himachal Pradesh HPTET N-2513 - Free Online Practice Test

121. What type of stoichiometric defect is shown by ZnS? A. Frenkel defect B. Metal excess defect C. Schottky defect D. Metal deficiency defect

122. In ideal solutions, enthalpy change ΔmixH is A. ΔmixH > 1 B. ΔmixH < 1 C. ΔmixH = 0 D. ΔmixH ≥ 1

123. Colligative property used to find molar mass of polymers & proteins A. Depression in freezing point B. Relative lowering of vapour pressure C. Elevation in boiling point D. Osmotic pressure

124. Effect of temperature on Henry’s constant KH A. Increases B. Decreases C. Remains constant D. Decrease then increase

125. Pressure of H₂ to make H₂-electrode potential zero at 298 K A. 10⁻¹⁰ atm B. 10⁻⁴ atm C. 10⁻¹⁴ atm D. 10⁻¹² atm

126. Unit of rate constant K for first-order reaction A. mol L⁻¹ s⁻¹ B. s⁻¹ C. L mol⁻¹ s⁻¹ D. L² mol⁻² s⁻¹

127. Which is an acidic oxide? A. Mn₂O₇ B. Mn₃O₄ C. MnO D. Mn₂O₃

128. Maximum oxidation state of osmium (Os) A. 6 B. 7 C. 5 D. 8

129. No. of unpaired electrons in Ni²⁺ A. 0 B. 2 C. 4 D. 8

130. Most stable form of carbon thermodynamically A. Diamond B. Graphite C. Fullerene D. Coal