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here active form is in present perfect so the passive form will be –has+been + verb3, because big empire is a singular so we can’t use have ,means we have to use has.
Which of the following is the first organic compound that was synthesised in the laboratory?
Nitric oxide pollution can lead to all of the following, except
When electric current is passed through a wire, the amount of heat produced in a wire depends upon _____.
I. Length
II. Thickness
Which compound reacts with sodium metal to release hydrogen gas?
Speed of sound in air is unaffected by change in :
A bomb at rest explodes into two pieces of unequal masses. Which of the following is necessarily true about the motion of the fragments?
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
Which of the following vitamin contains Cobalt?
Which organ is known as the “filter” of the blood?
The leading producer of Muga silk in the world is:
