Questions

A gulf in geography is a large bay that is an arm of an ocean or sea.

The second smallest sea on Earth is the Sea of Cortez, more commonly called the Gulf of California. This sea is about 62,000 square miles. It lies between Mexico and the Baja California Peninsula.

Nearly 95% of india's coal is from the Gondwana formation (which is in the Satpuras) and is found in Bihar, Madhya Pradesh, Orissa, West Bengal, Maharashtra and Andhra Pradesh. Tertiary variety is found in Assam, Arunachal Pradesh, Meghalaya, Nagaland, and Jammu and Kashmir, Lingite reserves occur in Gujarat, Jammu and Kashmir, Rajasthan and Tamilnadu.

All of the above given options are storage devices.

Observe that in each column, square of sum of digits in the first row = Respective second row elements.

In the same way, square of sum of digits in the second row = Respective third row elements.

=> 6+42=102=100

=> 4+92=132=169

=> 8+12=92=81.

Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.