Test: Mole Concept, Volumetric & Redox - 2 - Chemistry MCQ

The number of moles of KMnO₄ that will be needed to react with one mole of sulphite ion in acidic solution is:

A certain compound has the molecular formula X₄O₆. If 10g of compound contains 5.62g of x, the atomic mass of x is approx:

Starch paper is used to test for the presence of [NCERT 1979]

When a solution of NaOH and Na₂CO₃ is titrated against standard HCl, the end point due to phenolphthalein is obtained after the reaction:

Cu²⁺ + I^– → Cu⁺ + I₂, I₂ + Na₂S₂O₃ → NaI + Na₂S₄O₆

If the moles of Cu²⁺ in above reaction consumed is ‘a’ then equivalents of Na₂S₄O₆ will be:

In the above equation if moles required of S₂O₃^2– to titrate I₂ was 2 then what were the moles of IO₃^– used:

IO₃^– + I^– + H⁺ → I₂ + H₂O, I₂ + S₂O₃^2– → I^– + S₄O₆^2–

Then factor Of FeS₂ in the following reaction  FeS₂ → Fe³⁺ + SO₂ would be:

Fe_0.94O → Fe³⁺, equivalent weight of reactants will be:

H₃PO₄ is a tribasic acid and one of its salt is NaH₂PO₄ . What volume of 1M NaOH solution should be added to 12g of NaH₂PO₄ to convert it into Na₃PO₄:

Sulphuryl chloride SO₂Cl₂, reacts with H₂O to give mixture of H₂SO₄ and HCl. Aqueous solution of 1mole of SO₂Cl₂ will be neutralized by:

When Cr₂O₇^2– ion act as an oxidant in acidic medium, Cr³⁺ ion is formed. The number of moles of Sn²⁺ that are oxidized to Sn⁴⁺ by one mole of Cr₂O₇^2– ion would be:

A 0.518g sample of limestone is dissolved in HCl and then calcium is precipitated as CaC₂O₄. After filtering and washing the precipitate it requires 60 ml of 0.25N KMnO₄ solution acidified with H₂SO₄ to titrate it as MnO₄^Θ + H⁺ + C₂O₄^2– → Mn²⁺ +CO₂ +2H₂O. The % of CaO in sample is:

Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen acc. To the equation , 2H₂O₂ (aq.) →  2H₂O (l) + O₂ (g) . Under conditions where 1 mole of gas occupies 24dm³. 100cm³ of xM solution of H₂O₂ produces 3dm³ of O₂. The x is:

What volume of O₂ measured at standard conditions will be formed by the action of 100ml of 0.5N KMnO₄ on H₂O₂ in an acid solution. The skeleton equation for the reaction is:

KMnO₄ + H₂SO₄ + H₂O₂ → KHSO₄ + MnSO₄ + H₂SO₄ +H₂O + O₂

The Equivalent weight of the salt KHC₂O₄.H₂C₂O₄.4H₂O used as reducing agent is:

If the eq. weight of a compound ‘A’ is M_A/4 when it reacts with compound ‘B’ whose eq. weight is M_B/5 then 4 mole of ‘A’ requires:

Density of air is 0.001293 g/cc. Its vapour density is:

In which Mode of expression, the concentration of a solution remain independent of temperature

A gaseous oxide contains 30.4% of nitrogen, one molecule of which contains one nitrogen atom. The density of the oxide relative to oxygen is:

When KMnO₄ acts as an oxidant and ultimately forms [MnO₄]^2–, MnO₂, Mn₂O₃ and Mn²⁺, then number of electrons transferred in each case respectively is:

Which of the following is a redox reaction:

Which reaction is possible at anode:

Which of the following reaction depicts the oxidizing behaviour of H₂SO₄:

In the standardization of Na₂S₂O₃ using K₂Cr₂O₇ by iodometry, the equivalent weight of K₂Cr₂O₇ is:

The reaction;

is an example of 

are two isotopes of chlorine. If average atomic mass is 35.5 then ratio of these two isotopes is:

A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore, the ratio of their number of molecules is