KMnO4 (m.w. = 158) oxidises oxalic acid in acid medium to CO2 and water as follows:
5C2O42− + 2MnO4− + 16H+ → 10CO2 + 2Mn2+ + 8H2O What is the equivalent weight of KMnO4? A. 158... View Article
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For the reaction,
Na2CO3 + 2HCl → 2NaCl + H2O + CO2, The equivalent weight of Na2CO3 is: A. M/2 B. M C.... View Article
In the disproportionation reaction:
3HClO3 ⟶ HClO4 + Cl2 + 2O2 + H2O The equivalent mass of the oxidising agent is (molar mass of... View Article
Mixture X = 0.02 mole of [Co(NH3)5 SO4] Br and 0.02 mole of [Co(NH3)rBr]SO4 was prepared in 2 L of solution.
1 L of the mixture if X + excess AgNO3 → Y 1 L of mixture X + excess BaCl2... View Article
KMnO4 reacts with oxalic acid according to the equation:
2MnO4− + 5C2O42− + 16H+ → 2Mn2+ + 10CO2 + 8H2O 20 mL of 0.1 M KMnO4 will react with?... View Article
Find the equivalent weight of KMnO4 which is in an alka condition and for which the reaction occurs as follows:
2KMnO4 + 2KOH ⟶ 2K2MnO4 + H2O + O A. 31.6 B. 52.7 C. 49 D. 158 Solution: (D) Equivalent... View Article
The enthalpy of combustion of methane at 25 ∘C is 890 kJ. The heat liberated when 3.2 g of methane is burnt in the air is:
A. 445 kJ B. 278 kJ C. -890kJ D. 178 kJ Solution: (D) Number of moles of methane burnt =... View Article
The volume of oxygen necessary for the complete combustion of 20 litre of propane is:
A. 40 litre B. 60 litre C. 80 litre D. 100 litre Solution: (D) C3H8 + 5O2 → 3CO2 +... View Article
When 10 g of 90% pure limestone is heated completely, the volume (in litres) of CO2 is liberated at STP is:
A. 22.4 B. 2.24 C. 20.6 D. 2.016 Solution: (D) As per the questions the sample of limestone is only... View Article
2g of a 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?
A. 60 B. 30 C. 70 D. 35 Solution: (B) 5CO + I2O5 → 5 CO2 + I2 1 mol... View Article
Air contains 20% O2 by volume. How many cc of air will be required for oxidation of 100 cc of acetylene?
A. 500 cc B. 1064 cc C. 212.8 cc D. 1250 cc Solution: (D) Writing the reaction down, 2C2H2 +... View Article
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:
A. 56 g B. 28 g C. 42 g D. 20 g Solution: (B) Weight of 11.2 dm3 of CO2... View Article
The stoichiometry of the following reaction is:
K2S2O8(aq) + 2KI(aq) → 2K2SO4(aq) + I2(aq) A. 2 : 2 B. 1 : 1 C. 1 : 2 D.... View Article
1 mole of methyl amine on reaction with nitrous acid gives at NTP
A. 1.0 L of nitrogen B. 22.4 L of nitrogen C. 11.2 L of nitrogen D. 5.6 L of nitrogen... View Article
Sodium nitrate on reduction with Zn in presence of NaOH solution produces NH3 Mass of sodium nitrate absorbing 1 mole of electron will be:
A. 7.750 B. 10.625 C. 8.000 D. 9.875 Solution: (B) Lets look at the following reaction: Zn + 2OH− ⟶... View Article
The ratio of amounts of H2S needed to precipitate all the metal ions from 100mL of 1MAgNO3 and 100mL of 1MCuSO4 will be:
A. 1:1 B. 1:2 C. 2:1 D. None of these Solution: (B) 100 mL of 1 M AgNO3 = 0.1... View Article
Match the following Column I and Column II.
A. A – 4, B – 1, C – 2, D – 3 B. A – 5, B – 1,... View Article
Acidified KMnO4 oxidizes oxalic acid to CO2. What is the volume (in litre) of 10−4MKMnO4 required to completely oxidize 0.5litre of 10−2M oxalic acid in acid medium?
A. 125 B. 1250 C. 200 D. 20 Solution: (D)
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 0.1N Hydrochloric acid. The volume of Hydrochloric acid required is: (At. mass of calcium = 40)
A. 500 cm3 B. 400 cm3 C. 300 cm3 D. 200 cm3 Solution: (A) Let us find the volume of... View Article
An aqueous solution containing 6.5gm of NaCl of 90% purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1M acetic acid required to neutralise NaOH obtained above is:
A. 100 cm3 B. 200 cm3 C. 1000 cm3 D. 2000 cm3 Solution: (A) Let us calculate the weight of... View Article
