Question
Which of the following statements is correct regarding
the cyanide sensor developed by researchers at the Central University of Kerala?Solution
• Option A is correct: The sensor was indeed developed by a research team at the Central University of Kerala led by Dr. Ravi Kumar Kanaparthi and is highly sensitive and selective for detecting cyanide, enhancing safety in water and food products. • Option B is incorrect: The sensor changes color from yellow to colorless upon detecting cyanide, not the other way around. • Option C is incorrect: While the WHO limits cyanide concentration in water to 0.19 mg/L, the sensor is designed to detect even lower concentrations, not just those above this limit. • Option D is incorrect: The sensor was tested on cyanide detection in tapioca extracts, not mango extracts. • Option E is incorrect: The findings were published in the Journal of Photochemistry and Photobiology A: Chemistry, not in the Journal of Analytical Chemistry.
- 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.)
119.922% of 599.90 + (34.78/20.89) × √64.29 × 29.76 ÷ √24.92 = ?2 - 99.92
?% of 1499.89 + 54.14 × 8 = 25.05% of 5568.08
44.89% of 600.25 + (29.98 × 5.67) + (√1940 – 10.29) = ?2Â
- 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.)
177.05 = 25.06% of 3631.97 + 16.02% of 3750.08 – ?3Â
(14.66)2 + (343.84 ÷ 3.88 - 55.87) = ? + 91.23
? = 26.08 + 18.99 × 25.07
44.98% of 399.98 = ? x 19.98 - (39.98% of 2499.98)
(519.98 + ?) ÷ 13.01 = √440 + 20.0
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