One mole of fluorine is reacted with two moles of hot concentrate

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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


B.

2 : 1 : 0.5

Stoichiometric equation for the reaction is-

F2 + 2KOH → 2KF + H2O + 12O2

Therefore, the molar ratio of KF, H2O and O2 is 2 : 1 : 0.5


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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


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


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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