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How many grams of NaOH should be dissolved in 1 litre of solution to prepare a solution with pH value12

An experiment was done in which different coloured light were shone onto a water plant separately and the rate of production of oxygen was measured. which coloured light will produce the lowest rate of production of oxygen? explain your answer

an object moves from point p to q with an average speed of 60m/s and comes back from point q to p with an average speed of 144km/h . what is the average speed of whole journey in m/s?