The correct answer is [C] It is used as a refrigerant and in fire extinguishers.That statement is incorrect because ozone is not used as a refrigerant or in fire extinguishers. Instead, CFCs are used as refrigerants and are harmful ...
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The correct answer is [A] Oestrogen.Oestrogen is the female sex hormone secreted by ovaries. It regulates the menstrual cycle and prepares the uterus for pregnancy. Lack of oestrogen causes irregularity, so doctors prescribe hormonal tablets to balance it. class 10 ...