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JEE 2020 Chemistry : Mole Concept and Stoichiometry Quiz-1 : 10.06.2019
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Question 1
5 g of benzene on nitration gave 6.0 g of nitrobenzene. What would be the percentage yield of the nitrobenzene?
Question 2
An organic compound contains C, H and S. The minimum molecular weight of the compound containing 8% sulphur is: (atomic weight of S=32 amu)
Question 3
An aqueous solution of oxalic acid dihydrate contains its 6 .3 g in 250 ml. The volume of 0 .1 N NaOH required to completely neutralize 10 ml of this solution-
Question 4
The electron affinity of chlorine is 3 .7 eV.1 gram of chlorine is completely converted to Cl-ion in a gaseous state. (1 eV. = 23 .06 kcal mol-1). Energy released in the process is-
Question 5
In the reaction, 2A
(s) + 6HCl
(aq) ¾→ 2A
3+(aq) + 6C
–(aq) + 3H2(g),
(s) + 6HCl(aq) ¾→ 2A3+(aq) + 6C–(aq) + 3H2(g),Question 6
How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
Question 7
What quantity (in mL) of a 45% acid solution of a mono-protic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid solution?
Question 8
The density of a solution prepared by dissolving 120 g of urea (mol. Mass = 60 u) in 1000g of water is 1.15 g/mL. The molarity of this solution is :
Question 9
An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives NH3 along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is
Question 10
A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration is removed. The dried sample weighed 52 g. The formula of the hydrated salt is: (atomic mass, Ba=137 amu, Cl=35.5 amu)
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