311.

The number of H⁺ ion in half normal solution of Na₂CO₃ and CH₃COOH :

• > 10^-7 m

• 10^-7 m

• < 10^-7

• 10^-5 m

The amount of BaSO₄ precipitated on mixing BaCl₂ (0.5 M) with H₂SO₄ (1 M) will correspond to

• 0.5 M

• 1.0 M

• 1.5 M

• 2.0 M

How many significant figures are present in 0.0000135?

• 7

• 8

• 4

• 3

100 cc of 0.6 N H₂SO₄ and 200 cc of 0.3 N HCl were mixed together .The normality of the solution will be :

• 0.2 N

• 0.4 N

• 0.8 N

• 0.6 N

Assertion : One mole of NaCl contains 6.023 $\times$ 10²³ molecules of sodium chloride.

Reason : 58.5 g of NaCl also contains 6.023 x 10²³ molecules of NaCl.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false.

A solution contains 25% H₂O , 25% C₂H₅OH and 50% CH₃COOH by mass .The mole fraction of H₂O would be :

• 0.25

• 2.5

• 0.502

• 5.03

An organic substance containing carbon , hydrogen and oxygen gave the following percentage composition .

C = 40.687 % , H = 5.085% and O = 54.228 % 

What is the empirical formula of the compound ?

• CH₃O

• C₂H₂O

• CH₄O

• C₂H₃O₂

How many grams of CO₂ will be produced by the complete combustion of 2 moles of ethanol ?

• 132 g

• 44 g

• 176 g

• 88 g

Which of the following changes with change in temperature ?

• Mole fraction

• Formality

• % (w/W)

• Molality

Equal weight of CO and CH₄ are mixed together in an empty container at 300 K. The fraction of total pressure exerted by CH₄ is.

• $\frac{16}{17}$

• $\frac{7}{11}$

• $\frac{8}{9}$

• $\frac{5}{16}$