Hydroxyl ion concentration of 10^-2 M HCl is :

• 1 x 10¹ mol dm^-3

• 1 x 10^-12 mol dm^-3

• 1 x 10^-1 mol dm^-3

• 1 x 10^-14 mol dm^-3

When 25 g of Na₂SO₄ is dissolved in 10 kg of solution, its concentration will be

• 2.5 ppm

• 25 ppm

• 250 ppm 

• 100 ppm

The volume of 10N and 4N HCl required to make 1 L of 7N HCl are :

• 0.50 L of 10N HCl and 0.50 L of 4N HCl

• 0.60 L of 10N HCl and 0.40 L of 4N HCl

• 0.80 L of 10N HCl and 0.20 L of 4N HCl

• 0.75 L of 10N HCl and 0.25 L of 4N HCl

Stomach acid, a dilute solution of HCl in water,can be neutralized by reaction with sodium hydrogen carbonate,

${\mathrm{NaHCO}}_{3_{\left(\mathrm{aq}\right)}}+ {\mathrm{HCl}}_{\left(\mathrm{aq}\right)}\to {\mathrm{NaCl}}_{\left(\mathrm{aq}\right)} + {\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{l}\right)} + {\mathrm{CO}}_{2\left(\mathrm{g}\right)}$

How many milliliters of 0.125 M NaHCO₂ solution are needed to neutralize 18.0 mL of 0. 100 M HCl?

• 14.4 ml

• 12.0 mL

• 14.0 mL

• 13.2 ml

Assertion : S. l. unit of atomic mass and molecular mass is kilograms.

Reason : Atomic mass is equal to the mass of 6.023x 10²⁴atoms.

• 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.

Assertion : The molality of the solution does not change with change in tempe-rature.

Reason : The molality is expressed in units of moles per 1000 g of solvent.

• 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.

What is the molarity of H₂SO₄ solution that has a density of 1.84 g/cc at 35$°$C and contains 98% by weight?

• 4.18 M

• 8.14 M

• 18.4 M

• 18 M

2.5 g of the carbonate of a metal was treated with 100 mL of 1N H₂SO₄. After the completion of the reaction, the solution was boiled off to expel CO₂ and was then titrated against 1N NaOH solution. The volume of alkali that would be consumed, if the equivalent weight of the metal is 20

• 50

• 25

• 75

• 100

79.

Percentage of Se (at. mass= 78.4) in peroxidase anhydrase enzyme is 0.5% by weight, then minimum molecular mass ofperoxidase anhydrase enzyme is

• 1.576 x 10⁴

• 1.576 X 10³

• 15.76

• 2.136 X 10⁴.

If the Vrms is 30 R^1/2 at 27^oC then calculate the molar mass of gas in kilogram .

• 1 Kg

• 2 Kg

• 0.001 Kg

• 0.002 Kg