1
JEE Main 2020 (Online) 9th January Morning Slot
Numerical
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The hardness of a water sample containing 10–3 M MgSO4 expressed as CaCO3 equivalents (in ppm) is ______.
(molar mass of MgSO4 is 120.37 g/mol)
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2
JEE Main 2020 (Online) 9th January Morning Slot
Numerical
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The molarity of HNO3 in a sample which has density 1.4 g/mL and mass percentage of 63% is _____.
(Molecular Weight of HNO3 = 63)
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3
JEE Main 2020 (Online) 8th January Morning Slot
Numerical
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The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3 g of [Co(NH3)6]Cl3 is ________.
M[Co(NH3)6Cl3] = 267.46 g/mol
MAgNO3 = 169.87 g/mol
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4
JEE Main 2020 (Online) 8th January Morning Slot
Numerical
+4
-0
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Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is _______.
Atomic weight : Fe = 55.85; S = 32.00; O = 16.00
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