Chemistry
(i) 20 g of NaCl is dissolved in 200 g of water. Calculate its concentration.
(ii) In order to make the concentration of alcohol 25%, how much alcohol is to be added to 150 cm3 of water?
(iii) Solubility of a substance at 45°C is 36.5g. What is meant by this statement?
Related Questions
Match the column A with column B:
Column A Column B (i) Hydrogen A. Alkali metal (ii) Boyle's law B. Group I (iii) SO2 C. P-V relationship (iv) Sodium D. Lead nitrate solution (v) Hydrogen sulphide E. Produced by burning coal Complete the following sentences by choosing the correct answer from the bracket:
(i) The element below sodium in the Periodic Table is …………… , reactive than sodium. (more/less)
(ii) …………… is a gas having a triple bond (Nitrogen/Ammonia)
(iii) The average kinetic energy of the molecules of the gas is proportional to the …………… (absolute temperature/pressure)
(iv) If temperature is reduced to half, …………… would also reduce to half provided pressure remains constant. (volume/pressure)
(v) Ozone depletion is mainly caused by the active …………… atoms generated from CFC in the presence of UV radiation. (chlorine/fluorine)
(i) Give a balanced chemical equation for each of the following:
- Reaction with one reactant forming three products.
- Reaction with two reactants forming two products.
- Reaction with two reactants forming three products.
(ii) Give a balanced chemical equation for the following word equation:
Potassium dichromate reacts with sulphuric acid and sulphur dioxide to form potassium sulphate, chromium (III) sulphate and water.
How will you distinguish between the following:
(i) Carbon dioxide gas and sulphur dioxide gas.
(ii) Hydrogen gas and hydrogen chloride gas?