Chemistry Copper substances when exposed to air gains a green coating due to the formation of: CuSO4 Cu(NO3)2 CuCO3 Cu(OH)2 CuO CuSO4 Cu(NO3)2 CuCO3 Cu(OH)2 CuO ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which substance is used to retard the setting action of cement? CaO Al2O3 CaSO4, 2H2O Na2O + K2O CaO Al2O3 CaSO4, 2H2O Na2O + K2O ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which of the following causes the rusting of iron? a. Oxidation b. Reduction c. Chemical reaction with oxygend. Chemical reaction with CO2 B and c A and c C and d A and b B and c A and c C and d A and b ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which of the following is used as non-stick coating for cooking utensils? Teflon Perspex Polystyrene Styrofoam Teflon Perspex Polystyrene Styrofoam ANSWER DOWNLOAD EXAMIANS APP
Chemistry Silicone is a polymer of Tetraalkyl silane Silicon tetrachloride Dialkyl dichloro silane Silane Tetraalkyl silane Silicon tetrachloride Dialkyl dichloro silane Silane ANSWER DOWNLOAD EXAMIANS APP
Chemistry What is the product formed when sodium bicarbonate is heated strongly? Sodium Hydroxide Sodium Peroxide Sodium Monoxide Sodium Carbonate Sodium Hydroxide Sodium Peroxide Sodium Monoxide Sodium Carbonate ANSWER DOWNLOAD EXAMIANS APP
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