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Phenolphthalein turns pink when exposed to substances above a pH of 8.2. This colour change is a result of ionization, which alters the shape and charge of phenolphthalein molecules. This causes it to block the blue light spectrum when exposed to alkaline substances, producing a pink to purple hue.
Find the approximate value of Question mark(?) for given equation.
(47.98 × 34.85 ÷ 7.09) – (80.81 ÷ 9.02 × 5.01) = ?
...39.99% of 159.98 = ?2 – 319.99% of 12.5 – 49.98% of 129.99
3.55% of 8120 – 66.66% of 540 = ? – 28% of 5500
√624.98 - ? = √(62.30 + 13.99 – 2.93)
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
126.003 × 11.987 + 23.04 × 12.96 = ?
619.97 ÷ 20.01 X 124.99 ÷ 24.91 = ?
25.04 × 22.03 + 383.92 ÷ ? + 23.78% of 1499.98 = 926.08
