A. this acid, in ancient times, was used to eliminate ant-hills B. this corrosive acid is secreted by ants to drive away their enemies C. this acid was first obtained by the distillation of ants D. ants are attracted by the odour of this acid
A. 2-methyl octane B. n-heptane C. iso-octane D. 3-methyl octane
A. smelting B. roasting C. calcinations D. froth floatation
A. p-electrons in Ne(Z = 10) B. s-electrons in Mg(Z = 12) C. d-electrons in Fe(Z = 26) D. p-electrons in CI(Z = 17)
A. Greenhouse effect B. Fire in coal mines C. Dry farming D. Monsoon
A. 1.8 gram of H2O B. 12 moles of KMnO4 C. 0.6N H2SO4 D. 4.6 gram of C2H5OH
A. C2H6O B. C6H18O3 C. C6H12O6 D. C2H5O
A. 74% Fe B. 75% Fe C. 77% Fe D. 78% Fe
A. 64.5% B. 65.6% C. 63.5% D. 61.5%