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- 1. Question
In which of the following is gallium showing an oxidation number of +3?
- 2. Question
The balancing of chemical equations is based on the law of………………….
- 3. Question
25.0cm3 of a solution containing 1.33g of Na2CO3 in 250cm3 required 24.5cm3 of a solution of H2SO4 for complete neutralization. What is the concentration of the acid?
- 4. Question
2.0g of limestone was treated with excess 0.5mol dm-3 HCL. The acid left at the reaction required 32cm3 of 0.02mol dm-3 Na2CO3 solution for neutralisation. What is the original volume of the acid?
- 5. Question
What is the percentage by weight of calcium in Ca(OCl)2? (Ca = 40, Cl = 35.5, O = 16)