Chemistry
From the list given below, select the word(s) required to correctly complete blanks (i) to (v) in the following passage. The words from the list are to be used only once. Write the answers as (a) (i), (ii), (iii) and so on. Do not copy the passage.
[ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt, water]:
(i) A solution M turns blue litmus red, so it must contain (i) …………… ions; another solution O turns red litmus blue and hence, must contain (ii) …………… ions.
(ii) When solution M and O are mixed together, the products will be (iii) ……………and (iv) ……………
(iii) If a piece of magnesium was put into a solution M, (v) …………… gas would be evolved.
Acids Bases Salts
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Answer
(i) A solution M turns blue litmus red, so it must contain (i) hydronium ions; another solution O turns red litmus blue and hence, must contain (ii) hydroxide ions.
(ii) When solution M and O are mixed together, the products will be (iii) salt and (iv) water
(iii) If a piece of magnesium was put into a solution M, (v) hydrogen gas would be evolved.
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State one appropriate observation for each of the following:
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(ii) Copper sulphide is treated with dilute hydrochloric acid.
(iii) Excess of chlorine gas is reacted with ammonia gas.
(iv) A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed by addition of ammonium hydroxide solution.
(v) Electricity is passed through molten lead bromide.
Identify the gas that is produced in each of the following cases:
(i) sodium propionate is heated with soda lime.
(ii) potassium sulphite is treated with dilute hydrochloric acid.
(iii) Sulphur is treated with concentrated nitric acid.
(iv) a few crystals of KNO3 are heated in a hard glass test tube.
(v) concentrated hydrochloric acid is made to react with manganese dioxide.
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(i) State the period and group to which Z belongs.
(ii) Is Z a metal or a non-metal?
(iii) State the formula of the compound between Z and hydrogen.
(iv) What kind of a compound is this?
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context answer the following :
(i) What kind of combination (bond) exists between M and O?
(ii) How many electrons are there in the outermost shell of M ?
(iii) State the reaction taking place at the cathode.
(iv) Which electrode: anode or cathode is the oxidising electrode? Why?