In which of the following process, Vanadium Pentoxide is used as a catalyst?
A). Contact process
B). Haber process
C). Solvay process
D). None of these
The rate of chemical reaction does not depend on?
Deficiency of vitamin D causes?
D). Night blindness
Which of the following is the best source of vitamin A?
Which of the following is not a chemical reaction?
A). Burning of paper
B). Digestion of food
C). Conversion of water into steam
D). Burning of coal
Which of the following is a chemical change?
A). Rusting of iron
B). Tempering of iron
C). Melting of iron
D). Bending of iron
Photoelectric effect was discovered by?
Tetraethyl lead is used as?
A). Mosquito repellent
B). Pain killer
C). Fire extinguisher
D). Petrol additive
The hydrogenation of the vegetables oils takes place in the presence of finely divided?
Which of the following is used in beauty parlor`s for hair setting?