EASY
Earn 100

10 ml of concentrated HCl were diluted to 1 litre . 20 ml of this diluted solution required 25 ml of 0.1 N sodium hydroxide solution for complete neutralization, the normality of the concentrated hydrochloric acid will be

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Important Questions on Redox Reaction

MEDIUM
In order to oxidize a mixture of one mole of each of FeC2O4,Fe2(C2O4)3,FeSO4 and Fe2(SO4)3 in acidic medium, the number of moles of KMnO4 is:
EASY
The volume of 0.1 M strong dibasic acid sufficient to neutralize 1g of a base that furnishes 0.04 mole of OH- in aqueous solution is :
MEDIUM
100 mL  of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is:
(molar mass of calcium bicarbonate is 162 gm mol-1 and magnesium bicarbonate is 146 g mol-1)
EASY
The volume strength of 8.9 M H2O2 solution calculated at 273 K and 1 atm is ........R=0.0821L atm K1 mol1 (rounded off to the nearest integer)
MEDIUM
The number of electron required to reduce chromium completely in Cr2O72- to Cr3+ in acidic medium, is
MEDIUM
The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL ) in terms of mass percentage and molarityM  respectively, are: (Take molar mass of hydrogen peroxide as 34 g/mol)
EASY

The strength of 11.2 volume solution of H2O2 is

[Given that, the molar mass of H=1 g mol-1 and O=16 g mol-1]

HARD

5.00 mL of 0.10 M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using phenolphthalein indicator. The volume of NaOH required for the appearance of permanent faint pink colour is tabulated below for five experiments. The concentration, in molarity, of the NaOH solution is xM.

Exp. No. Vol. of NaOH mL
1 12.5
2 10.5
3 9.0
4 9.0
5 9.0

What is the value of 100x

Round of your answer to the nearest integer.

 

 

MEDIUM
Complete reaction of 2.0 g of calcium (at wt. = 40) with excess HCl produces 1.125 L of H2 gas. Complete reaction of the same quantity of another metal "M" with excess HCl produces 1.85 L of H2 gas under identical conditions. The equivalent weight of "M" is closest to:
MEDIUM
1 mol of FeSO4 atomic weight of Fe is 55.84g mol-1 is oxidized to Fe2SO43 . Calculate the equivalent weight of ferrous ion
EASY
The volume (in mL) of 0.1 N NaOH required to neutralise10 mL of 0.1 N phosphinic acid is ____________.
HARD
In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is:
MEDIUM
The volume, in mL, of 0.02MK2Cr2O7, solution required to react with 0.288g of ferrous oxalate in acidic medium is (Molar mass of Fe=56gmol-1 )
 
MEDIUM
The number of moles of electron required to reduce 0.2 mole of Cr2O7-2 to Cr+3
MEDIUM

100 mL solution was made by adding 1.43 g of Na2CO3.xH2O. The normality of the solution is 0.1 N. The value of x is _______

(The atomic mass of Na is 23g/mol)

MEDIUM
0.45 g acid of molecular mass 90 was neutralise by 20 ml of 0.5 N KOH. The basicity of the acid is
MEDIUM
4 g of copper was dissolved in  conc.HNO3. The copper nitrate thus obtained gave 5 g of its oxide on strong heating the equivalent weight of copper is
EASY
The amount of Na2S2O35H2O required to completely reduce 100 mL of 0.25 N iodine solution, is
MEDIUM
The volume strength of 1MH2O2 is:

(Molar mass of H2O2=34gmol-1 )
MEDIUM
What is the hardness of a water sample (in terms of equivalents of CaCO3) containing 10-3MCaSO4?

(Molar mass of CaSO4=136g  mol-1)