Chemistry - Questions - 0001

Q1. What is the concentration of sugar (C12H22O11) in mol L–1 if its 20 g are dissolved in enough water to make a final volume up to 2L?
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Q2. If the density of methanol is 0.793 kg L–1, what is its volume needed for making 2.5 L of its 0.25 M solution?

Q3. (i) Calculate the number of electrons which will together weigh one gram.
(ii) Calculate the mass and charge of one mole of electrons.

Q4. What is the basic theme of organization in the periodic table?

Q5. Explain the formation of a chemical bond

Q6. Write Lewis dot symbols for atoms of the following elements :
a) Mg
b) Na
c) B
d) O
e) N
f) Br

Q7. What will be the minimum pressure required to compress 500 dm3 of air at 1 bar to 200 dm3 at 30°C?

Q8. Choose the correct answer. A thermodynamic state function is a quantity
(i) used to determine heat changes
(ii) whose value is independent of path
(iii) used to determine pressure volume work
(iv) whose value depends on temperature only

Q9. A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased.

a) What is the initial effect of the change on vapour pressure?
b) How do rates of evaporation and condensation change initially? 
c) What happens when equilibrium is restored finally and what will be the final vapour pressure?

Q10. What is Kc for the following equilibrium when the equilibrium concentration of each substance is: [SO2]= 0.60M, [O2] = 0.82M and [SO3] = 1.90M ?