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

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

• x

• x × 96500

• $\frac{\mathrm{x}}{96500}$

• 1.6 × 10¹⁹ × x

x 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

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

• CH

• CH₃

• CH₂

• CH₄

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

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

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

Match the following:

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

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

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