To write the chemical formulae, one must know the valency of the element. State whether the statement is True/False.
Statement-1: An element of valency 2 can combine with an element of valency 1. Statement-2: To write the chemical formula, one must know the symbol and valency of the elements.
Match the physical state of elements or compounds to their symbols as used while writing chemical equations:
Physical StateSymbol1. Gas(A) (s)2. Solid(B) (g)3. Liquid(C) (aq)4. Dissolved in water(solution with water)(D) (l)