$$\frac{27\times r^{4}\times h^{6}}{9\times r^{8}\times h^{3}}$$

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Consider the series

r^{2} + r^{4} + r^{6} + r^{8} + r^{10} + \dots \dots \dots \infty

. The third term is

16

times the fifth term . The sum of the series is:

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An acid with molecular formula

C_{7} H_{6} O_{3}

forms three types sodium salts, i.e.,

C_{7} H_{5} O_{3} N a, C_{7} H_{4} O_{3} {N a}_{2}

and

C_{7} H_{3} O_{3} {N a}_{3}

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9

arithmetic means and

9

harmonic means are inserted between

2

and

3

alternatively. If

A_{6}

and

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A_{6} + \frac{2}{H_{6}}

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O_{(g)} + e^{-} \to O_{(g)}^{-} Δ H_{1}

O_{(g)}^{-} + e^{-} \to O_{(g)}^{- 2} Δ H_{2}

O_{2 (g)} \to O_{2 (g)}^{+} + e^{-} Δ H_{3}

O_{(g)} \to O_{(g)}^{+} + e^{-} Δ H_{4}

H_{2 (g)} \to H_{2 (g)}^{+} + e^{-} Δ H_{5}

H_{(g)} \to H_{(g)}^{+} + e^{-} Δ H_{6}

O_{(g)} + 2 e^{-} \to O^{- 2} Δ H_{7}

Which of the following option(s) is/are correct?

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R1, R2, R3 and R4 are 4 rectangles with areas $15 m^{2}, 6 m^{2}, 9 m^{2} a n d 2 m^{2}$ respectively. Which is the 'biggest' rectangle?

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