Avagadro Constant = 6.022 x 10²³ atoms/mol Explanation
Avagadro number is the number of particles (atoms or molecules), that is contained in the amount of substance given by one mole. Avogadro’s constant, often designated with […]
What is the mass of precipitate formed when 50 mL of 16.9% solution of AgNO₃ is mixed with 50 mL of 5.8% NaCl Solution? (Ag=107.8, N=14, O=16, Na=23, Cl=35.5)
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(a) 28 g (b) […]
If avagadro number is changed from 6.022 x 10²³ mol⁻¹ to 6.022 x 10²⁰ mol⁻¹, this would change
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(a) the definition of mass in units of grams (b) the mass of one […]
The number of water molecules is maximum in
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(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 […]
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?
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(a) 75 (b) […]
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) […]
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 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
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(a) 1 mol of Hcl(g) (b) 2 mol of Hcl(g) […]
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