Question

C. Write true or false. Correct the false statements.
1. Iron has only one valency.
2. When an atom loses or gains electrons, it becomes a charged particle.
3. An atom that gains one or more electrons to form a negative ion is called a cation.
4. A hydroxide ion is a polyatomic ion.
5. The chemical formulae of different compounds can be written easily if the symbols and the
valencies of the elements are known.
6. The law of conservation of mass states that mass is created during a chemical reaction.
7. If heat is evolved during the reaction, it is endothermic .​

Answer 1

Answer:

question1 - False. It has 4 valency's

Answer 2

Answer:

Q1 - false

Q2-True

Q3- false

Q4-true

Q5-

Q6-false

Explanation:

Q7- false