Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.
15-30
90-100
250-300
< 0
- Hydrochloric acid is also known as
- Which of the following is used as a coagulant in treating turbid water?
- __________ is produced using Polycondensation reaction.
- Good quality of edible salt is obtained from brine by the process of
- Mannheim furnace is used in the manufacture of
- Cement mainly contains
- Transparent soaps (e.g. Pears) are
- Oleum produces fumes of
- Claude process of gas liquefaction employs
- Massecuite is
- At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the…
- The difference between saponification value and acid value is
- Pick out the wrong statement.
- Cellulose percentage in bamboo fibre is about
- Fusion of bauxite and __________ produces high alumina cement.
- Glauber's salt is chemically represented by
- The most widely used coagulant for removing suspended impurities from water is
- Pick out the wrong statement pertaining to the soap manufacture.
- Commonly used glass is known as the __________ glass.
- Main constituents of Portland cement are calcium aluminate and
- Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have
- Enamels
- Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart…
- Pick out the correct statement.
- Thermosetting plastic materials
- Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving)…
- Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at
- Main constituents of cotton fiber is
- Coke oven gas consists mainly of
- Which of the following is a detergent?