Which of the following rock systems in India is the latest one?

Which one of the following rock systems in India is the main source of coal deposits?

Which one of the following is a type of igneous rock?

Which one of the following is not an igneous rock ?

Which of the following geological systems of rocks contain a rich reserve of iron ore in India?

Which one of the following is the appropriate reason for considering the Gondwana rocks as most important of rock systems of India?