1. Equal masses of oxygen hydrogen and methane are kept under identical conditions. The ratio of the volume of gases will be ___.
A. 2: 16: 2
B. 2: 16: 1
C. 1: 16: 1
D. 1: 1: 1
2. The forces of attraction that exist between non-polar molecules are called ___.
A. Van der waals/ dispersion forces
B. Covalent bonds
C. Ionic bonds
D. Electro-valent bonds
3. The Law which states that the amount of gas, dissolved in a liquid is proportional to its partial pressure is ___.
A. Dalton’s. Law
B. Gay Lussac’s Law
C. Henry’s Law
D. Reoult’s Law
4. The inert gases are __ in water.
A. sparingly soluble
D. none of the above
5. The mass of one Avogadro number of helium atom is ___.
D. 4 x 6.02 x 1023 g
6. The method that cannot be used for removing permanent hardness of water is ___.
A. adding sodium carbonate
B. adding caustic soda
7. The following are the half-lives of four active isotopes. Which one of the following is the most dangerous to handle?
A. 3 billion years
B. l00 years
C. 0.01 minute
D. 13 days
8. The heat energy produced when the human body metabolizes 1 gram of fat is ___.
9. The luster of a metal is due to ___.
A. its high density
B. its high polishing
C. its chemical inverter
D. presence of free electrons
10. The number of waves in n x 10th Bolur’s orbit are ___.
11. The graphite rods in the nuclear reactor ___.
A. react with U to release energy
B. produce neutrons
C. undergo combustion which triggers the nuclear fission
D. convert fast moving neutrons into thermal neutrons
12. The gas used for artificial ripening of green fruit is ___.
C. carbon dioxide
13. The metal used to recover copper from a solution of copper sulphate is ___.
14. The metallurgical process in which a metal is obtained in a fixed state is called ___.
D. froth floatation
15. The number of d – electrons in Fe2+ (Z= 26) is equal to that of ___.
A. p – electrons in Ne (Z = 10)
B. s – electrons in Mg (Z = 12)
C. d electrons in Fe (z = 26)
D. p – electrons in CI (z = 17)
16. The Latin word Formica means ant. The name formic acid is derived from Latin word being ___.
A. this acid in ancient times was used to eliminate ant-hills
B. thin corrosive acid is secreted by ants to drive away their enemies
C. this acid was first obtained by the distillation of ants
D. ants are attracted by the odour of this acid
17. The empirical of an oxide of nitrogen containing 30.4% nitrogen is (N = 14.0, 0 =16.0)
18. Indicate which of the following statements is not true as we move from left to right along the periodic table.
A. Atomic mass of element increases
B. electro-positive character of clement increase
C. Atomic number of element increases
D. number of electrons in the outermost orbits of elements increases
19. In the redox reaction: 2Fe2e +Cl2 → 2Fe3e +2e
A. Cl2 is reduced, because it lost electrons
B. Cl2 reduced, because it oxidation number has change
C. Cl2 is reduced. because it molecules is changed
D. 2Fe2e is reduced_ because it has gained electron
20. How many grammes of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm3 of 6mol/dm3 of hydrochloric acid according to the equation?
2Mg +2HCl→ MgCl2 +H2 (Mg=24, cl=35.5, H=1)
Check questions 21 – 40 here