Q. The hydronium ion is
? H3O+
Q. The most electropositive elements among the following is
? Cs
Q. The gas used for artificial ripening of green fruit is
? Ethylene
Q. Zone refining is used for the purification of
? Ge
Q. The molecule which has the highest percentage of ionic character among the following is
? HF
Q. The iron ore magnetite consists of
? Fe2O3
Q. The major constituent of air is
? Nitrogen
Q. The main chemical constituent of clay is
? Aluminium silicate
Q. The mineral containing both magnesium and calcium is
? Dolomite
Q. The metal does not give H2 on treatment with dilute HCL is
? Ag
Q. The main active constituent of tea and coffee is
? Caffeine
Q. The maximum number of isomers for an alkene with molecular formula C4H8 is
? 4