HARD
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A metallic oxide contains 53% metal. The vapour density of the chloride of the metal is 66. Find the atomic weight of the metal.

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Important Questions on Redox Reactions

EASY
0.177g of a monobasic acid required 30ml of N/10 NaOH solution for complete neutralization. Its molecular weight will be
EASY
15 mL of aqueous solution of Fe2+ in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr2O72-. The molarity of the Fe2+ solution is _______ ×10-2M (Round off to the Nearest Integer).
EASY
KMnO4 reacts with H2O2 in an acidic medium. The number of moles of oxygen produced per mole of KMnO4 is;
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)
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 )
 
HARD
20 mL of 0.02MK2Cr2O7 solution is used for the titration of 10 mL of Fe2+ solution in the acidic medium. The molarity of Fe2+ solution is____×10-2M
MEDIUM

50 mL of 0.2 N HCl is titrated against 0.1 N NaOH solution. The titration is discontinued after adding 50 mL of NaOH solution. The remaining titration is completed by adding 0.5 N KOH solution. What is the volume of KOH solution required for completing the titration ?

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]

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)

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.

 

 

HARD
In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is:
MEDIUM

A 20.0 mL solution containing 0.2 g impure H2O2 reacts completely with 0.316 g of KMnO4 in acid solution. The purity of H2O2 (in %) is______  (mol. wt. of H2O2=34; mol. wt. of KMnO4=158)

MEDIUM
The volume strength of 1MH2O2 is:

(Molar mass of H2O2=34gmol-1 )
MEDIUM
The neutralization occurs when 10 mL of 0.1 M acid 'A' is allowed to react with 30 mL of 0.05 M base MOH2. The basicity of the acid 'A' is
[M is a metal]
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
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:
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)
MEDIUM
In basic medium CrO42- oxidises S2O32- to form SO42- and itself changes into CrOH4-.The volume of 0.154MCrO42- required to react with 40 mL of 0.25MS2O32- is _____ mL. (Rounded-off to the nearest integer)
EASY
The volume (in mL) of 0.1 N NaOH required to neutralise10 mL of 0.1 N phosphinic acid is ____________.
EASY
The amount of Na2S2O35H2O required to completely reduce 100 mL of 0.25 N iodine solution, is