A chapter to application of group 2 elements
Quiz by Haziqq Hashrim
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9 questions
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- Q1When a firework is lit, a fuel an oxidising agent react together. In one such firework magnesium is the fuel and barium nitrate is the oxidising agent. Which solid are produce when the firework is lit ?magnesium oxidebarium oxidebarium nitratemagnesium nitrate10s
- Q2What is the use of slaked lime in agriculture ?Use by farmers to raise pH of soilAs a fertilizer to cropsUse by farmer to lower the pH of soil10s
- Q3Rat poison needs to be insoluble in rain water but soluble at a low pH of stomach contents. What is a suitable barium compound to use ?barium hydroxidebarium carbonatebarium sulphatebarium chloride10s
- Q4Uses of compound X are to be use as a building material and manufacture an agricultural chemical to adjust soil pH. What is compound X ?calcium carbonatebarium carbonatecalcium sulphateberyllium carbonate10s
- Q5Calcium oxide is roasted with clay to make cement. What are the substances added to cement to produce concrete ?calcium carbonate + sandsand + watersand + rock + calcium carbonatesand + rock + water10s
- Q6River water in a chalky agricultural area contains calcium, magnesium, carbonate, bicarbonate and nitrate ions. In a water treatment plant, such water is treated by adding a calculated quantity of calcium hydroxide. What will be precipitated from the river water following the addition of calcium hydroxide?calcium nitratecalcium bicarbonatecalcium carbonatecalcium hydroxide10s
- Q7Why is most agricultural lime made from calcium carbonate instead of calcium hydroxide ?Exist in a large proportion and easy to acquireCheaperCan easily sodden into soilSoluble in water10s
- Q8How to determine the presence of calcium carbonate in soil ?A white residue formedThe gas will relight glowing wooden splinterA brown gas is releasedEffervescence or fizzing10s
- Q9Which statement is true ?calcium magnesium carbonate (dolomite) - mostly soluble in watercalcium oxide (quick/burned lime) - reacts with water to form hydrated limecalcium hydroxide (slaked/hydrated lime) - relatively soluble in watercalcium carbonate (calcite/limestone) - mostly soluble in water20s