Statement (iv) is true. Statements (i), (ii) and (iii) are false. Elements contain identical atoms, compounds contain atoms of different elements and nitrogen gas exists as diatomic molecules with two atoms.
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The correct option is (iii). Two Fe3+ ions provide a total positive charge of 6+ and three O2- ions provide a total negative charge of 6-, making the combination neutral and fully balanced.
Element X needs two electrons to complete its valence octet. Two X atoms share two electron pairs equally, establishing a double covalent bond to create a stable diatomic molecule with the structure X double bond X.
Element A loses one electron to form a unipositive cation A+. Element B gains two electrons to form a dipositive anion B2-. They combine through an ionic bond to form the compound A2B.
Ravi was confused and embarrassed because Grandpa said he did not know where Ravi had been, although Ravi had secretly followed him earlier. Ravi also realised that Grandpa might know about his actions.