Which of the following statement about a catalyst would be true?
Ⅰ. It increases the equilibrium constant for the forward reaction only.
Ⅱ. It increases the equilibrium constant for both the forward and backward reaction.
Ⅲ. It has no effect on the position of equilibrium.
Which of the following metals gives a green flame when heated?
Which of the following elements in the third period has the same oxidation number in ALL of its known compounds?
On heating CaSO4 strongly, it decomposes into CaO and SO3(g). CaCO3 decomposes at a much lower temperature than CaSO4. Which of the following factors BEST explains the greater thermal stability of CaSO4?
When AgNO3(aq) is added to fluoride ions followed by NH3(aq) the result is
Which of the following phrases BEST describe the relationship between the half-life of a second order reaction and the reactants?
Which of the following solids has a giant molecular lattice?
Which of the following factors is important in determining the stability of an isotope?
The Item refers to the following equation which shows the production of ammonia.
N2(g) + 3H2(g) ⇌ 2NH3(g)
If 10 cm3 nitrogen reacts with 30 cm3 of hydrogen at STP, what volume of NH3 is produced?
Using standard electrode potentials, which of the following reactions would be MOST feasible?
The rate law for a given reaction is Rate = K[A]2 [B]. What are the units for K?
Which of the following statements is TRUE about 5 dm3 of hydrogen and 5 dm3 of oxygen at 0 ℃ and 101 kPa?
The Item refers to the electrochemical below.
Zn(s) | Zn2+ (aq) || Ag+ (aq) | Ag(s)
In the cell shown above, electrons originate from
Which of the following statements does NOT refer to a system in dynamic equilibrium?
Which of the following expressions represents the solubility product of iron(Ⅲ) hydroxide?
Which of the following ions has the GREATEST polarizing power?
Which of the following statement is NOT a part of Dalton's atomic theory?
In which of the following options are the halide ions placed in order of INCREASING reducing power?
A weak acid, HX, dissociate as follows:
HX(aq) ⇌ X-(aq) + H+(aq)
The dissociation contank Ka, for the above reaction is 1.0 x 10-12 mol md-3. What will be the approximate pH of 1.0 x 10-2 mol md-3 HX?
The simplest formula for a compound that contains 50% S and 50% O by mass is
The Item refers to the following diagram which shows the energy levels for the hydrogen atom and the electronic transitions which produce lines in the visible region.
Which of the series below involves transitions from higher energy levels to the n = 2 levels?
The value of Kp for the equilibrium reaction
H2(g) + I2 (g) ⇌ 2HI (g) at 444 ℃ at 1 atm pressure is 50.
What is the value of Kp if the pressure is changed to 2 atm and the temperature remains the same?
For complete reaction, 0.25 g of a monobasic acid requires 10 cm3 of 0.2 mol dm3 sodium hydroxide. What is the relative molecular mass of the acid?
Which of the following processes represents an oxidation?
Which of the following elements reacts very slowly with cold water and burns with a bright white flame?
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