Explanation
H‒ will take up H+ from H2O to give H2
Low density of ice compared to water is due to H-bonding interactions which leave large empty spaces in the crystal lattice.
Cu does not react with HCl (dil.).
Structure of H2O2 is non-planar
CO2 is an acidic oxide
H2O has the highest b.p. due to H-bonding in it.
Cu being less electropositive than H cannot liberate hydrogen from acids
Water gas contains about 50 volume of H2, 40 volume of CO and 5 volume of CO2 and N2 etc
Statements I, II and III are correct. In statement IV absolute alcohol is required for evolving nascent hydrogen by reacting with Na.
Heavy water is D2O, temporary hardness is due to bicarbonates of Mg and Ca in water, soft water does not contain any foreign ions and permanent hardness is due to sulphates and chlorides of Mg and Ca in water.
Sea water can be purified by reverse osmosis
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Acidified KMnO4 solution is reduced by H2O2 to Mn2+ ions
Hardness of water in terms of Ca2+ and Mg2+ ions can be calculated by titrating hard water with Na2 EDTA.
Mixture of liquid hydrogen and liquid oxygen is used as a propellant for rockets
NH3 is more basic due to more tendency of N to donate its lone pair (having lower electronegativity) than H2O. Hence it has the highest proton affinity.
MgCO3 and CaCO3 are water insoluble. CaSO4 dissolves in water adding Ca2+ ions which are responsible for producing hardness in water
Perhydrol is 30% H2O2.
10 vol. H2O2 = 3% then 30% H2O2 has 100 volume strength
TiH1.73 is a non-stoichiometric metallic or interstitial hydride
Brackish water mostly contains NaCl dissolved in it.
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