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1. Question4 points
Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weighs 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weights of X and Y are [NEET 2016]Correct
2. Question4 points
If Avogadro number NA, is changed from 6.022 × 1023 mol–1 to 6.022 × 1020 mol–1, this would change [AIPMT 2015]Correct
3. Question4 points
The number of water molecules is maximum in [AIPMT 2015]Correct
4. Question4 points
Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g.mL–1. Volume of acid required to make 1 litre of 0.1 M H2SO4 solution is: [CBSE AIPMT Preliminary 2007]Correct
5. Question4 points
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is:
(Atomic mass : Al = 27) [CBSE AIPMT Preliminary 2005]Correct