Which of the following are mixtures?
i, Petroleum
ii, Rubber latex
iii. Vulcanizer’s solution
iv, Carbon (II)sulphide
- A. i, ii and iii
- B. i, ii and iv
- C. i and ii only
- D. i and iv
Which of the following can be obtained by fractional distillation?
- A. Nitrogen from liquid air
- B. Sodium chloride from sea water
- C. Iodine from a solution of Iondine in carbon tetrachloride
- D. Sulphur from a solution of sulphur incarbon disulphide
0.1 faraday of electricity deposited 2.95 g of nickel during electrolysis of an aqueous solution.
Calculate the number of moles of nickel that will be deposited by 0.4 faraday?
(Ni = 58.7)
- A. 0.20
- B. 0.30
- C. 0.04
- D. 5.87
If 10.8 g of silver is deposited in a silver coulometer volume of oxygen liberated is?
- A. 0.56 dm3
- B. 5.60 dm3
- C. 11.20 dm3
- D. 22.40 dm3
What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm3 of 0.05 M acid?
- A. 0.05 dm3
- B. 0.10 dm3
- C. 0.55 dm3
- D. 11.0 dm3
What is the concentration of H+ ions in moles per dm3 of a sodium of pH 4.398?
- A. 4.0 χ 10-5
- B. 0.4 χ 10-5
- C. 4.0 χ 10-3
- D. 0.4 χ 10-3
2.0g of a monobasic acid was made up to 250 cm3 with distilled water. 25.00 cm3 of this solution required 20.00cm3 of 0.1 M NaOH solution for complete neutralization. The molar mass of the acid is?
- A. 200 g
- B. 160 g
- C. 100 g
- D. 50 g
Na2C2O4 + CaCl2 → CaC2O4 + 2NaCl. Given a solution of 1.9g of sodium oxalate in 50g of water at room temperature, calculate the minimum volume of 0.1 M calcium oxalate using the above equation?
- A. 1.40 χ 102 dm3
- B. 14.0 χ 102 cm3
- C. 1.40 χ 10-2 dm-2
- D. 14.0 χ 10-2 cm3
Smoke consist of?
- A. solid particles dispersed in liquid
- B. solid or liquid particles dispersed in gas
- C. gas or liquid particles dispersed inliquid
- D. liquid particles dispersed inliquid
The solubility in moles per dm3 of 20g of CuSO4 dissolve in 100 of water at 180°C is?
(Cu = 63.5, S = 32, O = 16)
- A. 0.13
- B. 0.25
- C. 1.25
- D. 2.00
A blue solid, T, which weighed 5.0g was placed on a table. After 8 hours, the resulting pink solid was found to weigh 5.5g. It can be inferred that substance T?
- A. is deliquescent
- B. is hydroscopic
- C. has some molecules of water of crystallization
- D. is efflorescent
10.0 dm3 of air containing H2S as an impurity was passed through a solution of Pb(NO3)2 until all the H2S had reacted. The precipitate of PbS was found to weigh 5.02 g. According to the equation:
Pb(NO3)2 + H2S → PbS + 2HNO3 the percentage by volume of hydrogen sulphide in the air is?
(Pb = 207, S = 32, GMV at s.t.p = 22.4dm3)
- A. 50.2
- B. 47.0
- C. 4.70
- D. 0.47
Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5.
The relative abundance of the isotope of mass number 37 is?
- A. 20
- B. 25
- C. 50
- D. 75
X(g) → X\(^-\)(g). The type of energy involved in the above transformation is?
- A. ionization energy
- B. sublimation energy
- C. lattice energy
- D. electron affinity
Which of the following terms indicates the number of bonds that can be formed by an atom?
- A. Oxidation number
- B. Valence
- C. Atomic number
- D. Electronegativity
…………………P….Q…..R……S
Proton…………..13….16….17…..19
Electron…………13….16….17…..19
Neutron………….14….16….35…..20
Which of the four atoms P,q,R and in S in the above data can be described by the following properties relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?
- A. P
- B. Q
- C. R
- D. S
A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that?
- A. collisions are perfectly elastic
- B. forces of repulsion exist
- C. forces of repulsion are in equilibrium
- D. collision are inelastic
Equal volumes of CO,SO2, NO2 and H2S were released into a room at the same point and time. Which of the following gives the order of diffusion of the gases to the opposite corner of the room?
(S = 32, C = 12, O = 16, N = 14, H = 1)
- A. CO, SO2,NO2,H2S
- B. SO2,NO2,H2S,CO
- C. CO,H2S,SO2,NO2
- D. CO,H2S,NO2,SO2
The volume occupies by 1.58g of a gas at s.t.p is 500cm3. What is the relative molecular mass of the gas?
(G.M.V at s.t.p = 22.40dm3)
- A. 28
- B. 32
- C. 44
- D. 71
If a gas occupies a container of volume 146 cm3 at 18°C and 0.971 atm, its volume in cm3 at s.t.p is?
- A. 133
- B. 146
- C. 266
- D. 292
Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid ?
- A. Carbon (IV) oxide
- B. Coal tar
- C. Charcoal
- D. Toxic fumes