Chemistry
Identify the term/substance in each of the following:
(i) The tendency of an atom to attract electrons to itself when combined in a compound.
(ii) The method used to separate ore from gangue by preferential wetting.
(iii) The catalyst used in the conversion of ethyne to ethane.
(iv) The type of reactions alkenes undergo
(v) The electrons present in the outermost shell of an atom.
Chemical Bonding
ICSE 2016
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Answer
(i) Electronegativity
(ii) Froth flotation process
(iii) Nickel or platinum or palladium.
(iv) Addition reaction
(v) Valence Electrons
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Related Questions
Write balanced chemical equations for each of the following:
(i) Action of warm water on AlN.
(ii) Action of hot and concentrated Nitric acid on copper.
(iii) Action of Hydrochloric acid on sodium bicarbonate.
(iv) Action of dilute Sulphuric acid on Sodium Sulphite.
(v) Preparation of ethanol from Ethyl Chloride.
State your observations when:
(i) Dilute Hydrochloric acid is added to Lead nitrate solution and the mixture is heated.
(ii) Barium chloride solution is mixed with Sodium Sulphate Solution.
(iii) Concentrated Sulphuric acid is added to Sugar Crystals.
(iv) Dilute Hydrochloric acid is added to Copper carbonate.
(v) Dilute Hydrochloric acid is added to Sodium thiosulphate.
(i) A gas of mass 32 gms has a volume of 20 litres at S.T.P. Calculate the gram molecular weight of the gas.
(ii) How much Calcium oxide is formed when 82 g of calcium nitrate is heated? Also find the volume of nitrogen dioxide evolved:
2Ca(NO3)2 ⟶ 2CaO + 4NO2 + O2
[Ca = 40, N = 14, O = 16]
Match the salts given in column I with their method of preparation given in column II.
Column I Column II (i) Pb(NO3)2 from PbO (A) Simple displacement (ii) MgCl2 from Mg (B) Titration (iii) FeCl3 from Fe (C) Neutralization (iv) NaNO3 from NaOH (D) Precipitation (v) ZnCO3 from ZnSO4 (E) Combination