1) the red litmus strip turns blue when place in each of the following except a) oven cleaner b) ketchup c) toothpaste d) baking soda solution 2) what is the substance which dissolves in water and turns it into an alkaline solution a) MgO b) SO3 c) CO2 d) NO2 3) Which of the following is a property of sodium hydroxide a) it dissolves in water producing H+ ions b) its solution reacts with HCL forming salt and water c) its aqueous solution turns blue litmus strip to red d) its solution react with lithium hydroxide solution forming salt and water 4) the ion present in lemon juice that causes the colour change in litmus strip is a) NH4+ b) O2- c) H+ d) OH- 5) which of the following oxides when dissolved in atmospheric water vapour produces acid rains a) SO2 b) CaO c) Na2O d) MgO

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