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Answer 1

Answer:

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iii. Nitrogen dioxide with water.

When nitrogen dioxide reacts with water, Mono-nitrogen oxides eventually form nitric acid when dissolved in atmospheric moisture, forming a component of acid rain.

iv. Concentrated sulphuric acid and water.

Concentrated sulfuric acid can perform a dehydration reaction with table sugar. After mixing, the color changes from white to brownish and eventually to black. As the acid dehydrates the sucrose, the water produced will dilute the sulfuric acid, giving out energy in the form of heat.

v.Copper with concentrated nitric acid.

Nitric acid reacts with copper according to the reaction: 4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l) The copper nitrate salt that forms is a deep blue color. The nitrogen dioxide is a maroon vapor. Place the copper disk in the bottom of the glass cylinder.

Answer 2

Answer:

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