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Which of the following is a large blood vessel that carries blood away from the heart?

Why white clothes are cooler as compare to black clothes?

Bone ash contains

Helium gas is used in gas balloons instead of hydrogen gas as it is

Name two elements that find wide application in transistor industry

The alkoloid naturally found in coffee, cocoa cola nut is

The percentage of oxygen present in air is approximately

What is the term used for the ability of a metal to be drawn into thin wires ?

Which of the following is a Lewis acid ?

Widespread resistance of malarial parasite to drugs like chloroquine has prompted attempts to develop a malarial vaccine to combat malaria. Why is it difficult to develop an effective malaria vaccine?