Solution:Coat of mail and helmet made of gold and iron is mentioned in Rigveda. Possibly they were used in warfare. Indus Valley people were lacking in weapons and wee possibly ruled by a class of merchants. Indus valley civilization did not leave any evidence of using weapons.Therefore, statement 1 is correct. Rigvedic Aryans knew gold, silver and copper. Indus Valley people knew only copper and bronze. The use of iron spread in North India between 1000 BC - 600 BC.
Therefore, statement 2 is wrong Rigvedic Aryans owed their success in India to their use of horses and chariots and recently a site called Bhagwanpura has been excavated in Haryana (of Rigvedic period) where horse bones have also been found. Evidence of the horse comes from a superficial level of Mohanjo-daro and from a doubtful terracotta figurine from Lothal.