Which of the following shows little or no net reaction when the volume of the system is decreased?
- A. H2(g) + I2(g) ↔ 2HI(g)
- B. 2NO2(g) ↔ N2O4(g)
- C. PCl5(g) ↔ PCl3(g) + Cl2(g)
- D. 2O3(g) ↔ 3O2(g)
N\(_2\)O\(_4\),(g) ↔ 2NO\(_2\)(g)
In the endothermic reaction above, more product formation will be favoured by
- A. a constant volume
- B. an increase in pressure
- C. a decrease in pressure
- D. a decrease in volume
Which of the following hydrogen halides has the highest entropy value?
- A. HF
- B. HCl
- C. HBr
- D. HI
2CO(g) + O\(_2\)(g) → 2CO\(_2\)(g)
Given that ΔH[CO]is -110.4 kJmol-1 and ΔH[CO\(_2\)] is -393.0 kJmol-1, the energy change for the reaction above is
- A. -503.7 kJ
- B. -282.6 kJ
- C. +282.6 kJ
- D. +503.7 kJ
The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is
[Ag = 108, F = 96500 c mol-1]
- A. 108.0g
- B. 54.0g
- C. 27.0g
- D. 13.5gq
In the electrolysis of brine, the anode is
- A. platinum
- B. copper
- C. zinc
- D. carbon
Which of the following acts as both reducing and oxidized agent?
- A. H2
- B. SO2
- C. H2S
- D. CO2
ZnO(s) + CO(g) → Zn(s) + CO\(_2\)(g)
In the reaction above, Zinc has been
- A. decomposed
- B. displaced
- C. oxidized
- D. reduced
The oxidation state of chlorine in HClO\(_4\) is
- A. -5
- B. -1
- C. +1
- D. +7
What volume of 0.5 mol dm\(^{-3}\) H\(_2\)SO\(_4\) will exactly neutralize 20cm\(^3\) of 0.1 mol dm\(^{-3}\) NaOH solution?
- A. 2.0 cm3
- B. 5.0 cm3
- C. 6.8 cm3
- D. 8.3 cm3
Which of the following compound is a normal salt?
- A. NaHS
- B. NaHSO4
- C. NaHCO3
- D. Na2CO3
Calcium tetraoxosulphate (VI) dissolves in water only sparingly to form a
- A. solution
- B. suspension
- C. precipitate
- D. colloid
The solubility in moldm\(^{-3}\) of 20g of CuSO\(_4\) dissolved in 100g of water at 180\(^o\)C is
[Cu = 64, S = 32, O =16]
- A. 0.13
- B. 0.25
- C. 1.25
- D. 2.00
A carcinogenic substance is
- A. asbestos dust
- B. sawdust
- C. nitrogen (II) oxide
- D. carbon (II) oxide
Pollution of underground water by metal ions is very likely in the soil that has high
- A. acidity
- B. alkalinity
- C. chloride content
- D. nitrate content
Hardness of water is caused by the presence of ions of
- A. magnesium and silver
- B. cacium and magnesium
- C. sodium and potassium
- D. calcium and sodium
Which of the following mixture of gases is likely to burn in flame
- A. neon and hydrogen
- B. nitrogen and helium
- C. helium and neon
- D. neon and nitrogen
Chlorine consisting of two isotopes of mass number 35 and 37 in the ratio 3:1 has an atomic mass of 35.5. Calculate the relative abundance of the isotopes of mass number 37
- A. 20
- B. 25
- C. 60
- D. 75
The property of chlorine which causes hydrogen chloride to be more ionic than the chlorine molecules is its
- A. electrovalency
- B. electron affinity
- C. electropositivity
- D. electronegativity
\(^{226}\)\(_{88}\)Ra → \(^x\)\(_{86}\)Rn + α – particle
What is the value of x in the nuclear reaction above?
- A. 220
- B. 222
- C. 226
- D. 227
The shape of s-orbitals is
- A. spherical
- B. elliptical
- C. spiral
- D. circular