If an equilibrium reaction has ΔH > 0, the reaction will proceed favourably in the forward direction at
- A. High temperature
- B. Any temperature
- C. Low temperature
- D. Minimum temperature
A change in temperature of a saturated solution disturb the equilibrium between the
- A. Dissolved solute and the solvent
- B. Solvent and undissolved solute
- C. Dissolved solute and undissolved solute
- D. Dissolved solute and the solution
When 10g of sodium hydroxide is dissolved in 1000cm\(^3\) of water, the sodium formed is approximately
[Na = 23, H = 1, O = 16]
- A. 0.01 mol dm-3
- B. 0.10 mol dm-3
- C. 0.25 mol dm-3
- D. 0.50 mol dm-3
Farmlands affected by crude-oil spillage can be decontaminated by
- A. Adding acidic solution
- B. Using aerobic bacteria
- C. Pouring water on the affected water area
- D. Burning off the oil from the area
What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm3 solution?
[K2CrO4 = 194.2g mol-1]
- A. 0.97g
- B. 9.70g
- C. 19.42g
- D. 97.10g
A liquid that will dissolve fat is?
- A. Hydrochloric acid
- B. Calcium hydroxide
- C. Kerosene
- D. Water
The structural component that makes detergent dissolve more quickly in water than soap is
- A. -SO3- Na+
- B. -COO-Na-
- C. -SO4- Na+
- D. -COO-K+
Which of the following ions is acidic?
- A. K+
- B. KNO3-
- C. S2-
- D. H3O+
A consequence of global warming is?
- A. air pollution
- B. water pollution
- C. increased humudity
- D. flooding
The weakest attractive force that can be observed between two molecules is
- A. ionic
- B. covalent
- C. coordinate covalent
- D. van der Waals
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes
- A. negatively charged
- B. positvely charged
- C. neutral
- D. bipolar
A gas exerts pressure on its container because
- A. some of its molecules are moving faster than others
- B. of the collision of the molecules with each other
- C. of the mass of the molecules of gas
- D. the molecules of a gas colide with the walls of the container
I. H = 1S\(^1\) II. N = 1S\(^2\) 2S\(^2\)2P\(^3\) III. O = 1S\(^2\) 2S\(^2\) 2P\(^4\) IV. Zn = 1S\(^2\) 2S\(^2\) 2P\(^6\) 3S\(^2\) 3P\(^6\) 4S\(^2\) 3d\(^{10}\)
From the above, which of the following pairs is like to be paramagnetic?
- A. I and II
- B. I and III
- C. I and IV
- D. III and IV
According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to
- A. Decrease
- B. Increase
- C. Remain constant
- D. Be zero
The noble gases owe their inactivity to
- A. Octet configuration
- B. Cyclic shape
- C. Hexagonal shape
- D. Obtuse configuration
Neutral atoms of neon with atomic number 10 have the same number of electron as
- A. O2+
- B. Ca2+
- C. K+
- D. Mg2+
3Cu + pHNO3 →3Cu(NO)2 + 4H2 O + xNO
In the equation above, the values of p and x respectively are
- A. 1 and 3
- B. 2 and 3
- C. 6 and 2
- D. 8 and 2
The filter in the cigarette reduces the nicotine content by
- A. Burning
- B. Adsorption
- C. Evaporation
- D. Absorption
What is the percentage by mass of oxygen in Al2(SO4)3. 2H2O?
[Al = 27, S = 32, H = 1, O = 16]
- A. 14.29%
- B. 25.39%
- C. 50.79%
- D. 59.25%
Which of the following is physical change?
- A. Burning kerosene
- B. Freezing ice cream
- C. Exposing white phosphorus
- D. Dissolving calcium in water
What volume of oxygen is produced from the decomposition of 2 mole of KCIO3 at s.t.p?
[Molar volume of a gas at s.t.p = 22.4 dm3]
- A. 22.4 dm3
- B. 33.6 dm3
- C. 44.8 dm3
- D. 67.2 dm3