Question

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15 What is dam? Why do we seek to build large dams? While building large dams, which three main
problems should particularly be addressed to maintain peace among local people ? Mention
16. (a) Write the steps involved in the extraction of pure metals in the middle of the activity series from
their carbonate ores.​

Answer 1

This question is from the Booklet of Together With (CBSE Sample Paper 2019-20)

Answer 2

Answer:

Ans –15-Dams are the barrier build across the river to control the overflow of water , control flood , and generate electricity

1. Three problems should particularly be addressed to maintain peace among local people

• Benefits of dams are used by both rich and poor
• They gave sufficient amount of money to the people which were replaced by the damss
• They provide sufficient electricity

Ans –16- STEP 1ST – Concentration of ore , In this method firstly convert the ore into powdered form by any method

STEP 2ND – Burning of separated compound in the absence of air

CaCO3 —> Cao + CO2

STEP 3RD – Reduction of burnt metal (CaO) by Coke

CaO + C —> Ca + CO

STEP 4TH – This involves electroytic refining of the reduced metal in which they get converted into pure metal

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