Chemistry Mart Sem 1 Set D

Which of the following statement is TRUE?

• l has values form 1 to ∞

• m describes the orientation in space of an orbital

• n has values from 0 to l - 1

• m has 2n+1 values

Consider the following reaction:

2NO₂(g) + 7H₂(g) ⇌ 2NH₃(g) + 4H₂O(g) +993kJ

that takes place in an container. When the volume of the container is increased at the same temperature,

• equilibrium constant, K_p remains the same.

• the pressure will increase.

• the rate of forward reaction will increase.

• the reaction becomes exothermic.

The quantum number ( n, l, m, s ) for the valance electron of a potassium atom (has 19 electrons) in the ground state can be

• ( 3, 0, 0, -1/2 )

• ( 3, 1, 1, -1/2 )

• ( 4, 0, 0, -1/2 )

• ( 4, 2, 1, -1/2 )

Which of the following pairs of compound contains only acidic oxides?

• Na₂O and Cl₂O₇

• MgO and SO₃

• Al₂O₃ and SiO₂

• SO₃ and Cl₂O₇

What is the shape of the molecule with the structure?

• Tetrahedral

• Trigonal Planar

• Octahedral

• Trigonal pyramidal

The boiling point of water is defined as

• The temperature at which its vapour pressure is equal to the external pressure

• The pressure at which the temperature reaches 100^oc

• The temperature and pressure when solid, liquid, and vapour can exist in equilibrium

• The state where liquid changes to vapour

Determine the acid-base pair that will provide titration curve as shown in Figure below.

• HCl - NH₃

• HCl - NaOH

• CH₃COOH - NH₃

• CH₃COOH - NaOH

What is the difference between 2s and 3s orbitals?

• Shape

• Orientation

• Energy

The kinetic theory of gas states that

I gaseous particles are very small and their volume is negligible compared to the volume of the container

II the pressure in a vessel is due to the elastic collision between the gaseous particles and the container walls

III the average kinetic energy of the gas molecules is directly proportional to the absolute temperature

• I only

• I and II only

• II and III only

• All the above

Indicator solutions

I are usually weak organic acid or base that changes colour over the range of pH

II are chosen depending on the pH at which the end point is expected to occur in a titration

III are normally added when the pH of the titration mixture is around 7

• I only

• I and II only

• II and III only

• All the above