Newspaper can be recycled again and again how many times ?

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Three elements needed for the healthy growth of plants are_________________?

A. N P K B. N K C C. N S P D. N Ca P...

Residence time of methane in the atmosphere is___________________?

A. 3 – 7 days B. 2 -3 days C. 3 – 7 years D. 2 – 3 years...

Hypochlorous acid is used for disinfecting the water it reacts with the dissolved ammonia producing___________________?

A. NH2Cl B. NHCI2 C. NCI2 D. all of the above...

Which of the following is not a secondary pollutant_________________?

A. ozone B. carbonic acid C. sulphuric acid D. carbon dioxide...

Major cause of SO2 on global scale is__________________?

A. volcanoes B. electric sparks C. combustion D. all...