The Equivalent Masses Of Na2CO3 when It Is Titrated With HCl Using Phenolphthalein And Methyl Orange Indicators In Separate Experiments Are

Why Kaysons ?

Video lectures

Access over 500+ hours of video lectures 24*7, covering complete syllabus for JEE preparation.

Online Support

Practice over 30000+ questions starting from basic level to JEE advance level.

Live Doubt Clearing Session

Ask your doubts live everyday Join our live doubt clearing session conducted by our experts.

National Mock Tests

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.

Organized Learning

Proper planning to complete syllabus is the key to get a decent rank in JEE.

Test Series/Daily assignments

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.



The equivalent masses of Na2CO3 when it is titrated with HCl using phenolphthalein and methyl orange indicators in separate experiments are


Correct option is

106 and 53


For phenolphthalein used as indicator

Eq. mass of Na2CO3 = molar mass = 106

Purple colour disappears at this stage of reaction during titration.

For methyl orange used as indicator :  

Eq. mass = molar mass/2 = 106 /2 = 53

Red colour appears at the completion of above reaction.



In which of the following compounds the oxidation number of carbon is not zero?


When ethane is  burnt in presence of excess of oxygen, the oxidation number of carbon changes by


In a reaction, 3mol of electrons are gained by 1 mol of HNO3. Assuming no change in oxidation state of hydrogen the possible product obtained due to reduction will be


Ratio of mols of Fe(II) oxidised by equal volumes of equilmolar KMnO4and K2Cr2O7 solutions in acidic medium will be


The oxidation numbers of most electronegative element in the products of hydrolysis of peroxydisulphuric acid are



For the redox reaction  the correct coefficients of the reactants for the balanced equation are



The equivalent  mass of Na2CrO4 used as oxidant in acidic medium is (Cr = 52)


Which of the following can be reduced by SnCl2 solution



Hydrazine reacts with KIO3 in presence of HCl as

The equivalent masses of N2H4 and KIO3 respectively are



In iodometric estimation of Cu2+ ions, the following reactions take place

If 100mL of CuSO4 solution added to an excess of KI requires 50mL of 0.2 M Na2S2O3, the molarity of CuSO4 solution is