Chemistry

What effect does a catalyst have on the equilibrium position of a reaction?
(a) A catalyst favours the formation of products
(b) A catalyst favours the formation of reactants
(c) A catalyst does not change the equilibrium position of a reaction
(d) A catalyst may favour reactants or product formation, depending upon the direction in which the reaction is written.

On addition of acetate ions to an acetic acid solution, the concentration of hydrogen ions, [H⁺]

(a) Becomes zero                     (b) Is unchanged                        (c) Increases                             (d) Decreases

As the size of A increases down the group, H-A bond strength decreases and so the acid strength 

(a) Increases                                 (b) Decreases

(c) Remains constant                     (d) Becomes negligible

1.38 Copper crystallises into a fcc lattice with edge length 3.61 * 10^–8 cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm^–3.

15.22 Identify the monomer in the following polymeric structures.

15.21 Write the names and structures of the monomers of the following polymers: (i) Buna-S (ii) Buna-N (iii) Dacron (iv) Neoprene

11.7 Predict the major product of acid catalysed dehydration of (i) 1-methylcyclohexanol and (ii) Butan-1-ol 

The variation of vapour pressure of different liquids with temperature is shown in Fig. 5.6. 

i. Calculate graphically boiling points of liquids A and B. 

ii. If we take liquid C in a closed vessel and heat it continuously. At what temperature will it boil? 

Isotherms of carbon dioxide at various temperatures are represented in Fig. 5.5. Answer the following questions based on this figure.

i. In which state will CO₂ exist between the points a and b at temperature T₁?

ii. At what point will CO₂ start liquefying when temperature is T₁?

iii. At what point will CO₂ be completely liquefied when temperature is  T₂?

iv. Will condensation take place when the temperature is T₃.

v. What portion of the isotherm at T₁ represents liquid and gaseous CO₂ at equilibrium? 

Assertion (A): Liquids tend to have maximum number of molecules at their surface.

Reason (R) : Small liquid drops have spherical shape.

(i) Both A and R are true and R is the correct explanation of A.

(ii) Both A and R are true but R is not the correct explanation of A.

(iii) A is true but R is false.

(iv) A is false but R is true.