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Metallic bond is a bond between two metal atoms. Here in the given option Hg is the only metal with metallic bond.

The kidneys are stimulated to produce renin by a decrease in the blood pressure.

The renin-angiotensin system or RAS regulates blood pressure and fluid balance in the body. When blood volume or sodium levels in the body are low, or blood potassium is high, cells in the kidney release the enzyme, renin. Renin's primary function is therefore to eventually cause an increase in blood pressure, leading to restoration of perfusion pressure in the kidneys.

Demand curve is the relationship between price and quantity of product. In perfect competition, the demand curve for the product by a firm is perfectly elastic at maket price.

The President can declare financial emergency under Article 360.

The world's largest silver producer is Mexico.

The Head Quarters of Archaeological Survey Of India is in New Delhi.

India's rank in the latest ICC One Day International Rankings is Second. England tops the list followed by India, South Africa, New Zealand, Pakistan, Australia in the list.

Whereas India's rank in the latest ICC Test International Rankings is First followed by South Africa and England in 2nd and 3rd places.