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1. Question4 points
20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (At. wt. : Mg = 24) [AIPMT 2015]Correct
2. Question4 points
What amount of dioxygen (in gram) contains 1.8 × 1022 molecules? [Karnataka CET 2015]Correct
3. Question4 points
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecule is [JEE MAIN 2014]Correct
4. Question4 points
How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl? [CBSE AIPMT Preliminary 2008]Correct
5. Question4 points
An element, X has the following isotopic composition;
200X : 90%
199X : 8.0%
202X : 2.0%
The weighted average atomic mass of the naturally-occurring element X is closest to: [CBSE AIPMT Preliminary 2007]Correct