नीचे दिए गए

Which is the lightest and most abundant chemical element, constituting roughly 75 % of the Universe’s elemental mass?

Diamond is harder than graphite because of which of the following reason?

The process of depositing a layer of any desired metal on another material by means of electricity is called:

Which of the following relation is correct?

Which is the correct IUPAC name for CH₃CH₂CH(CH₃)CH₂OH?

In a compound, the elements are always present in definite proportions by:

What is dehydration? 

Which of the following statement is/are true?

I. Metal oxides are acidic in nature

II. Non-metallic oxides are basic in nature

Who measured the velocity of light first?

Which endocrine gland requires iodine to synthesize a particular hormone, whose deficiency may cause goitre disease?