(i) Write the composition of bleaching powder.(ii) What happens when NaCl is heated with conc. H2SO4 in the presenceof MnO2. Write the chemical equation.
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(i) Write the composition of bleaching powder.
(ii) What happens when NaCl is heated with conc. H2SO4 in the presence
of MnO2. Write the chemical equation.
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- Cite the overall reaction for the extraction of (a) Fe, (b) Al, and (c) Mg from their corresponding metal oxides when coupled with the oxidation of C (s) to CO (g). Which of these metals can be extracted from its oxide at 1800 °C?Why are sulphide ores converted to oxide before reduction?Describe the preparation of KMn04 from pyrolusite ore (MnO4). How does the acidified permanganate solution react with the following: (i) Fe2+ ions (ii) Oxalic acid (C2H204) Write the ionic equations for the reactions involved.
- Write a balanced ionic equation to represent the oxidation of iodide ion (I- ) by permanganate ion (MnO4) in basic solution to yield molecular iodine (I- ) and manganese(IV) oxide (MnO2).Calculate the volume of CO2 , measured at 19oC and 720mmHg pressure , which would be obtained by the action of excess HCl on 10.0g of Calcium trioxocarbonate (IV).1. What are the important considerations in determining the % ash content and elemental contents of plants under investigation? 2. Suggest other methods of analysis of commercial herbal drugs. Enumerate and discuss each.
- (i) Indicate the principle behind the method used for the refining of Nickel. (ii) What is the role of dilute NaCN in the extraction of gold? (iii) What is ‘copper matte’?The iron content of a large lump of ore is determined by taking a single small sample, dissolving it in acid, and titrating with ceric sulphate after reduction of Fe (III) to Fe (II). What are the possible source of random and systematic errors?A 600.0 mg sample consisting of only CaC2O4and Mg C2O4is heated at 500oC converting the two salts to CaCO3and MgCO3. The sample weighs 465.0 mg. If the sample had been heated at 900oC where the products are CaO and MgO, what would the mixture of oxides weigh? Write in a padpaper and show the clear and complete solution
- A breathalyzer test is used to detect drunken drivers. The crystals used will change colour, from orange to dark green, if ethanol vapour is detected. Explain the colour change and give a suitable equation for the reaction.(i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCl?(ii) What type of stoichiometric defect is shown by NaCl?a) Which ion, Pt(II) or Mn(II), is more likely to form a sulfide in the presence of H2S in water. b) Rationalize your answer with the trends in hard and soft character. c) Give a balance chemical equation from your reaction.