MEDIUM
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The formula mass of Mohr's salt is 392. The iron present in it is oxidised by KMnO4 in acid medium. The equivalent mass of Mohr's salt is

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Important Questions on Some Basic Concepts of Chemistry

HARD
g of acetic acid is added to 250 mL of 0.1 M HCl and the solution made up to 500 mL. To 20 mL of this solution 1mL of 5M NaOH is added. The pH of the solution is ________
[Given: pKa of acetic acid =4.75, molar mass of acetic acid 60 g/mol,log3=0.4771 , Neglect any changes in volume]
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
EASY
When 10 mL of an aqueous solution of Fe2+ ions was titrated in the presence of dil H2SO4 using diphenylamine indicator, 15 mL of 0.02 M solution of K2Cr2O7 was required to get the end point. The molarity of the solution containing Fe2+ ions is x×10-2 M. The value of x is ______. (Nearest integer)
EASY
The unit of atomic mass, amu is replaced by u, here u stands for
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
MEDIUM
A fuel cell generates electricity by using methanol as fuel and O2 as the oxidant. Calculate the equivalent weight of methanol.
MEDIUM
Consider an imaginary ion X3-2248. The nucleus contains 'a'% more neutrons than the number of electrons in the ion. The value of 'a' 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
The number of moles of electron required to reduce 0.2 mole of Cr2O7-2 to Cr+3
MEDIUM
The number of electron required to reduce chromium completely in Cr2O72- to Cr3+ in acidic medium, is
EASY
Calculate mass of 3.01×1024 atoms of an element having atomic mass 21.13.
EASY
The average molar mass of chlorine is 35.5 g mol-1. The ratio of Cl35 to Cl37 in naturally occurring chlorine is close to :
MEDIUM
Two elements A and B which form 0.15 moles of A2B and AB3 type compounds. If one mole of each A2B and AB3 weigh equally, then the atomic weight of A is____times of atomic weight of B.
EASY
Which symbol replaced the unit of atomic mass, amu?
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
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:
HARD
In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is:
MEDIUM
8 g of a metal hydroxide on heating produces 5 g metal oxide. If the atomic mass of the metal is 7, then the formula of its chloride is