The concentration of oxalic acid is 'x' mol L-1. 40 mL of this so

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 Multiple Choice QuestionsMultiple Choice Questions

111.

One mole of fluorine is reacted with two moles of hot concentrated KOH. The products formed are KF, H2O and O2. The molar ratio of KF, H2O and O2 , respectively is

  • 1 : 1 : 2

  • 2 : 1 : 0.5

  • 1 : 2 : 1

  • 2 : 1 : 2


112.

The electrochemical equivalent of a metal is 'x' g coulomb-1. The equivalent weight of metal is

  • x

  • x × 96500

  • x96500

  • 1.6 × 1019 × x


113.

grams of water is mixed in 69 g of ethanol. Mole fraction of ethanol in the resultant solution is 0.6. What is the value of x in grams?

  • 54

  • 36

  • 180

  • 18


114.

An organic compound containing C and H has 92.3% of carbon. Its empirical formula is

  • CH

  • CH3

  • CH2

  • CH4


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115.

x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of x (in grams)?

  • 44

  • 200

  • 150

  • 50


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116.

The concentration of oxalic acid is 'x' mol L-1. 40 mL of this solution reacts with 16 mL of 0.05 M acidified KMnO4. What is the pH of 'x' M oxalic acid solution ? (Assume that oxalic acid dissociates completely)

  • 1.3

  • 1.699

  • 1

  • 2


A.

1.3

Oxalic acid = x mol/L

Oxalic acid = KMnO4

        M1V1 = M2V2

40 mL × x = 16 mL × 0.05

x = 16 × 0.0540  = 150

x = 150 M

Now, convert molarity into normality.

N × equivalent weight = M × molecular weight of oxalic acid

                      N × 45 = 150 × 90

                              N = 125

This normality represents the hydrogen ion concentration. 

So, [H+] = 125

pH = log 1[H+] = log 25 = 1.3


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117.

Assertion (A): Equal moles of different substances contain same number of constituent particles.

Reason (R) : Equal weights of different substances contain the same number of constituent particles.

The correct answer is

  • Both (A) and (R) are true and (R) is the correct explanation of (A)

  • Both (A) and (R) are true but (R) is not the correct explanation of (A).

  • (A) is true, but (R) is false

  • (A) is false but (R) is true


118.

Match the following:
List - I List - II
A. 10 gm CaCO3 decomposition (i) 0.224 L CO2
B. 1.06 g Na2CO3 Excess HCl (ii) 4.48 L CO2
C. 2.4 g C CombustionExcess O2 (iii) 0.448 L CO2
D. 0.56 g CO combustionExcess O2

(iv) 2.24 L CO2

(v) 22. 4 L CO2

The correct match is

  • A - iv; B - i; C - ii; D - iii

  • A - v; B - i; C - ii; D - iii

  • A - iv; B - i; C - iii; D - ii

  • A - i; B - iv; C - ii; D - iii


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119.

138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is

  • 3 :4

  • 1: 2

  • 1:4

  • 1: 1


120.

1.5 g of CdCl2 was found to contain 0.9 g of Cd. Calculate the atomic weight of Cd.

  • 118

  • 112

  • 106.5

  • 53.25


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