JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 9 - MCQExams.com

A 5.82 g silver coin is dissolved in nitric acid. When sodium chloride is added to the solution, all the silver is precipitated as AgCl. The AgCl precipitate weighs 7,20 g. The percentage of silver in the coin is
  • 60.3%
  • 80%
  • 93.1%
  • 70%
If 20 g of CaCO3 is treated with 100 mL of 20% HCl solution, the amount of CO2 produced is
  • 22.4 L
  • 8.80 g
  • 4.40 g
  • 2.24 L
5 moles of Ba(OH)2 are treated with excess of CO2. How much BaCO3 will be formed?
  • 39.4 g
  • 197 g
  • 591 g
  • 985 g
20 mL of methane is completely burnt using 50 mL of oxygen. The volume of the gas left after cooling at room temperature is
  • 40 mL
  • 60 mL
  • 30 mL
  • 80 mL
The mass of potassium dichromate crystals required to oxidise 750 cm3 of 0.6 M Mohr's salt solution is (Given, molar mass : potassium dichromate = 294, Mohr's salt = 392)
  • 0.49 g
  • 0.45 g
  • 22.05 g
  • 2.2 g
Stoichiometric ratio of sodium dihydrogen orthophosphate and sodium hydrogen orthophosphate required for synthesis of Na5P3O10 is
  • 1.5 : 3
  • 3 : 1.5
  • 1 : 1
  • 2 : 3
A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca2+ ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture (atomic mass of Ca=is
  • 75
  • 30.6
  • 25
  • 69.4
An aqueous solution containing 6.5 g of NaCl of 90% purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1 M acetic acid required to neutralise NaOH obtained above is
  • 1000 cm3
  • 2000 cm3
  • 100 cm3
  • 200 cm3
Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N hydrochloric acid. The volume of hydrochloric acid required is (atomic mass of calcium = 40)
  • 300 cm3
  • 200 cm3
  • 500 cm3
  • 400 cm3
Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl because HCl
  • gets oxidised by oxalic acid to chlorine
  • furnishes H+ ions in addition to those from oxalic acid
  • reduces permanganate to Mn2+
  • oxidises oxalic acid to carbon dioxide and water
Acidified KMnO4 oxidises oxalic acid to CO2. What is the volume (in litres) of 10-4 M KMnO4 required to completely oxidise 0.5 L of 10-2 M oxalic acid in acidic medium ?
  • 125
  • 1250
  • 200
  • 20
Match the following Column I and Column II.
Chemistry-Some Basic Concepts of Chemistry-7491.png
  • A = 4 ,B = 1, C = 2, D = 3
  • A = 5 ,B = 1, C = 2, D = 3
  • A = 4 ,B = 1, C = 3, D = 2
  • A = 1 ,B = 4, C = 2, D = 3
The ratio of amounts of H2S needed to precipitate all the metal ions from 100 mL of 1 M AgNO3 and 100 mL of CuSO4, will be
  • 1 : 1
  • 1 : 2
  • 2 : 1
  • None of these

Chemistry-Some Basic Concepts of Chemistry-7494.png
  • 22.4 dm3
  • 44.8 dm3
  • 67.2 dm3
  • 11.2 dm3

Chemistry-Some Basic Concepts of Chemistry-7496.png
  • 11.4 mL
  • 12.0 mL
  • 33.3 mL
  • 35.0 mL
  • 25.0 mL
Sodium nitrate on reduction with Zn in presence of NaOH solution produces NH3. Mass of sodium nitrate absorbing 1 mole of electron will be
  • 7.750
  • 10.625
  • 8.000
  • 9.875
1 mole of methylamine on reaction with nitrous acid gives at NTP
  • 1.0 L of nitrogen
  • 22.4 L of nitrogen
  • 11.2 L of nitrogen
  • 5.6 L of nitrogen
The stoichiometry of the following reaction is
Chemistry-Some Basic Concepts of Chemistry-7500.png
  • 2 : 2
  • 1 : 1
  • 1 : 2
  • 2 : 1
The decomposition of a certain mass of CaCO3 gave 11.2 dm3 of CO2 gas at STP. The mass of KOH required to completely neutralise the gas is
  • 56 g
  • 28 g
  • 42 g
  • 20 g
Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is
  • 3
  • 4
  • 5
  • 6
In the reaction,
Chemistry-Some Basic Concepts of Chemistry-7504.png
  • 6 L HCl(aq) is consumed for every 3L H2(g) produced
  • 33.6L H2( g ) is produced regardless of temperature and pressure for every mole of Al that reacts
  • 67.2 L H2(g )at STP is produced for every mole of Al that reacts
  • 11.2L H2(g) at STP is produced for every mole of HCl(aq) consumed
Air contains 20% O2 by volume. How much volume of air will be required for 100 cc of acetylene ?
  • 500 cc
  • 1064 cc
  • 212.8 cc
  • 1250 cc
2 g of mixture of CO and CO2 on reaction with excess I2O5 produced 2.54 g of I2. What would be the mass % of CO2 in the original mixture ?
  • 60
  • 30
  • 70
  • 35
What amount of bromine will be required to convert 2 g of phenol into 2,4,6-tribromophenol ?
  • 20.44 g
  • 6.00 g
  • 4.00 g
  • 10.22 g
When 10 g of 90% pure limestone is heated completely, the volume (in litres) of CO2 is liberated at STP is
  • 22.4
  • 2.24
  • 20.16
  • 2.016
The volume of oxygen necessary for the complete combustion of 20 L of propane is
  • 40 L
  • 60 L
  • 80 L
  • 100 L
The enthalpy of combustion of methane at 25oC is 890 kJ. The heat liberated when 3.2 g of methane is burnt in air is
  • 445 kJ
  • 278 kJ
  • -890 kJ
  • 178 kJ
What is the weight of oxygen that is required for the complete combustion of 2.8 kg of ethylene ?
  • 9.6 kg
  • 96.0 kg
  • 6.4 kg
  • 2.8 kg
Sodium bicarbonate on heating decomposes to form sodium carbonate, CO2 and water. If 0.2 moles of sodium bicarbonate is completely decomposed, how many moles of sodium carbonate is formed ?
  • 0.1
  • 0.2
  • 0.05
  • 0.025
100 g of CaCO3 is treated with 1 L of 1 N HCl. What would be the weight of CO2 liberated after the completion of the reaction ?
  • 55 g
  • 11 g
  • 22 g
  • 33 g
  • 44 g
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