Chemical Process Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C. 250-300 15-30 90-100 250-300 15-30 90-100 ANSWER DOWNLOAD EXAMIANS APP
Chemical Process __________ is an ore concentrating metallurgical process involving a chemical change. Electromagnetic separation None of these Roasting Froth floatation Electromagnetic separation None of these Roasting Froth floatation ANSWER DOWNLOAD EXAMIANS APP
Chemical Process Which of the following, when pyrolysed, produces perchloro-ethylene? Chlorobenzene Chlorinated paraffin Ethylene dichloride Carbon tetrachloride Chlorobenzene Chlorinated paraffin Ethylene dichloride Carbon tetrachloride ANSWER DOWNLOAD EXAMIANS APP
Chemical Process Magnesium and calcium __________ cause temporary hardness of water. Carbonates Phosphates Bicarbonates Sulphates Carbonates Phosphates Bicarbonates Sulphates ANSWER DOWNLOAD EXAMIANS APP
Chemical Process High purity nitrogen is used in Fire fighting purposes Both A & B Making protective gas (95% N₂ + 5% H₂) for annealing of cold rolled steel strip coils Neither A nor B Fire fighting purposes Both A & B Making protective gas (95% N₂ + 5% H₂) for annealing of cold rolled steel strip coils Neither A nor B ANSWER DOWNLOAD EXAMIANS APP
Chemical Process Which of the following is a disacchride? Maltose Starch Sucrose Glucose Maltose Starch Sucrose Glucose ANSWER DOWNLOAD EXAMIANS APP
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