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Q. A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at
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Q. Which one of the following is a natural colloid ?
Q. Among the fuels given below, the one with highest calorific value is
Q. If lime water is kept in the air, it turns milky due to presence of :
Q. Which of the given coal contains 90 per cent of carbon
Q. Wavelength of X - rays is of the order of
Q. Which one of the following statements is correct?
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