محلول، توازن اور حرکیات

How many atoms are there in exactly 12 g of carbon-12?

• 1 6.022 x 10^23
• 2 12 x 6.022 x 10^23
• 3 3.011 x 10^23
• 4 6.022 x 10^22

What is the molarity of a solution containing 98 g of H2SO4 in 1 litre of solution? (H = 1, S = 32, O = 16)

• 1 0.5 M
• 2 2 M
• 3 98 M
• 4 1 M

The elevation of the boiling point of a solution is proportional to its:

• 1 Molality
• 2 Density
• 3 Volume
• 4 Colour

For N2 + 3H2 <-> 2NH3, the relation Kp = Kc (RT)^n has n equal to:

• 1 -2
• 2 2
• 3 -4
• 4 4

The forward reaction of an equilibrium is exothermic. Raising the temperature will:

• 1 Shift the equilibrium to the right
• 2 Shift the equilibrium to the left
• 3 Have no effect on the equilibrium
• 4 Double the equilibrium constant

For a first order reaction, doubling the concentration of the reactant makes the rate:

• 1 Double
• 2 Four times as large
• 3 Stay the same
• 4 Halve

What is the pH of 0.1 M NaOH at 25 degrees C?

• 1 1
• 2 13
• 3 12
• 4 14

Which of these is a Lewis acid?

• 1 NH3
• 2 H2O
• 3 BF3
• 4 OH-