Copper (II) tetraoxosulphate (VI) solution is electrolyzed using carbon electrodes. Which of the following are produced at the anode and cathode respectively ?
- A. Copper and oxygen
- B. Oxygen and copper
- C. Hydrogen and copper
- D. Copper and hydrogen
How many grams of H2SO4 are necessary for the preparation of 0.175 dm3 of M 6.00 M H2SO4?
(S = 32.06, O = 16.00 H = 1.00)
- A. 206.0 g
- B. 103.0 g
- C. 98.1 g
- D. 51.5 g
Which of these is an acid salt?
- A. K2SO4-.AI2(SO4)3.24H2O
- B. CuCO3.Cu(OH)2
- C. NaHS
- D. CaOCI2-
Arrange HCI, CH3COOH, C6H5CH3 in order of increasing conductivity.
- A. HCI, CH3COOH, C6H5CH3
- B. C6H5CH3, HCI, CH3COOH
- C. C6H5CH3, CH3COOH, HCI
- D. CH3COOH, C6H5CH3, HCI
A sample of orange juice is found to have a pH of 3.80. What is he concentration of the hydroxide ion in the juice?
- A. 1.6 x 10-4
- B. 6.3 x 10-11
- C. 6.3 x 10-4
- D. 1.6 x 10-11
An emulsion paint consists of ?
- A. gas or liquid particles dispersed in liguid
- B. liquid particles dispersed in liquid
- C. solid particles dispersed in liquid
- D. solid particles dispersed in solid
On which of the following is the solubility of a gaseous substance dependent? I. Nature of solvent II. Nature of solute III. Temperature IV. Pressure
- A. I, II, III and IV
- B. I and II only
- C. II only
- D. I, III and IV only
Water for town supply is chlorinated to make it free from?
- A. bad odour
- B. bacteria
- C. temporary hardness
- D. permanent hardness
Which of the following gases dissolves in water vapour to produce acid rain during rainfall?
- A. Oxygen
- B. Carbon (II) oxide
- C. Nitrogen
- D. Sulphur (IV) oxide
Four elements P,Q,R and S have 1,2,3, and 7 electrons in their outermost shells respectively. The element which is unlikely to be a metal is?
- A. P
- B. Q
- C. R
- D. S
The pollutants that are likely to be present in an industrial environment are?
- A. H2S,SO2 and oxides of nitrogen
- B. NH3, HCI and CO
- C. CO2, NH3 and H2S
- D. dust, NO and CI2
147N + X → 178O + 11 H. In the above reaction, X is a?
- A. neutron
- B. helium atom
- C. litgium atom
- D. deuterium atom
How many lone pairs of electron are there on the central atom of the H2O molecules?
- A. 1
- B. 2
- C. 3
- D. 4
The nucleus of the isotope tritium, contains?
- A. two neutrons with no protons
- B. one neutron and one protons
- C. two neutrons and one proton
- D. two neutrons, one proton and one electron
An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?
- A. number of molecules of the gas
- B. density of the gas molecules
- C. number of collisions between the gas molecules
- D. number of collisions between the gas molecules and the walls of the container
If 100 cm3 of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is?
(O = 16, H = 1)
- A. 10.0 s
- B. 12.5 s
- C. 17.7 s
- D. 32.0 s
Which of the following is a measure of the average kinetic energy of the molecules of a substance?
- A. Volume
- B. Mass
- C. pressure from age grades
- D. Temperature
A given mass of gas occupies 2 dm3 at 300k. At what temperature will its volume be doubled keeping the pressure constant?
- A. 400 k
- B. 480 k
- C. 550 k
- D. 600 k
wH2SO4 + xAI(OH)3 → yH2O + = zAI2(SO4)3. The respective values of w.x.y and z in the equation above are?
- A. 2,2,5 and 1
- B. 3,2,5 and 2
- C. 3,2,6 and 1
- D. 2,2,6 and 2
How many moles of (H+) are there in 1 dm3 of 0.5 M solution of H2SO4?
- A. 2.0 moles
- B. 1.0 moles
- C. 0.5 mole
- D. 0.25 mole
There is a large temperature interval between the melting point and the boiling point of a metal because?
- A. metals have very high melting points
- B. metals conduct heat very repaidly
- C. melting does not break the metalic bond but boiling does
- D. the crystal lattice of metals is easily broken