If avagadro number is changed what changes
If avagadro number is changed from 6.022 x 10²³ mol⁻¹ to 6.022 x 10²⁰ mol⁻¹, this would change
Options
(a) the definition of mass in units of grams (b) the mass of one […]
Basic Concepts of Chemistry
The number of water molecules is maximum in
The number of water molecules is maximum in
Options
(a) 1.8 molecules of water (b) 1.8 gram of water (c) 18 gram of water (d) 18 moles of water
Correct Answer:
18 moles […]
Magnesium carbonate of x g decomposes. What is the percentage of purity
20.0 g of a magnesium carbonate sample decomposes on heating to give CO₂ and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?
Options
(a) 75 (b) […]
What is the molar ratio of mixture of gases given the ratio of gases
A mixture of gases contains H₂ and O₂ gases in ratio of 1:4(w/w). What is the molar ratio of the two gases in the mixture?
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(a) 4:1 (b) 16:1 (c) 2:1 (d) […]
When x g of magnesium burnt with oxygen what is left
1.0 g of magnesium is burnt with 0.56 g O₂ in a closed vessel. Which reactant is left in excess and how much? At wt Mg=24, O₂=16)
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(a) Mg, 0.16g (b) O₂, 0.16g […]
When x litres hydrogen and chlorine are mixed, moles of HCl is
When 22.4 litres of H₂(g) is mixed with 11.2 litres of Cl₂(g), each at S.T.P, the moles of Hcl(g) formed is equal to
Options
(a) 1 mol of Hcl(g) (b) 2 mol of Hcl(g) […]