131. Chlorination of water may be harmful if the water contains_________________?
A. Ammonia
B. Dissolved oxygen
C. Carbon dioxide
D. All
132. The mass of one mole of electron is________________?
A. 1.008
B. 0.55
C. 0.184
D. 1.637
133. The number of atoms in a molecule determines________________?
A. macromolecule
B. macromolecule
C. molecularity
D. atomicity
134. Which element has same isotopes like palladium___________________?
A. Nickel
B. Calcium
C. Cadmium
D. Tin
135. A limiting reactant is one which________________?
A. is taken in lesser quantity in grams as compared to other reactants
B. is taken in lesser quantity in volume as compared to other reactants
C. gives the maximum amount of the product which is required
D. gives the minimum amount of the product under consideration
136. A safe and more reliable method for drying the crystal is__________________?
A. Hot air currents
B. folds of filter paper
C. oven
D. Vacuum desiccator
137. Ethy1 chloride on reduction in the presence of Zn/HCI produces___________________?
A. n. butane
B. Ethanol
C. Ethane
D. Diethy1 ether
138. For industrial preparation of CH3CHO catalytic promoter is_________________?
A. PdCl2
B. Cu2Cl2
C. CuCl2
D. PbCl2
139. Which of the following is not a fatty acid ?
A. Propanoic acid
B. Acetic acid
C. Phthalic acid
D. Butanoic acid
140. Which one of the following fertilizers provides the nitrogen and phosphorus to the plant ?
A. Urea
B. Calcium superphosphate
C. Diammonium phosphate
D. Potassium nitrate