Question

Suppose ‘X’ is an element which belongs to the group II B of Mendeleev’s periodic table and ‘Y’ is another element which belongs to the group VII A of Mendeleev’s periodic table. The chemical formula of oxides of ‘X’ and ‘Y’ respectively are

• A. $X_{2}OandY{O}_3$
• B. $X_{2}Oand{Y}_{3}O$
• C. $XOand{Y}_{3}O$
• D. $XOand{Y}_2{O}_7$

Answer 1

The correct option is D $XOand{Y}_2{O}_7$

The element ‘X’, which belongs to the group II B of Mendeléev’s periodic table, will form an oxide with the chemical formula XO, while another element ‘Y’, which belongs to the group VII A, will form an oxide with the chemical formula $Y_2{O}_7$
Hence, the correct answer is option (d).