16. How many valence electrons are contained in the element 3115P?
- A. 3
- B. 4
- C. 15
- D. 31
17. The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO3 is treated with 0.2dm3 of 1 Mole of HCL in the equation
CaCO3 + 2HCL ⇒ CaCl2 + H2O + CO2 , is ?
- A. 1.00 X 1023
- B. 6.02 X 1023
- C. 6.02 X 1022
D. 6.02 X 1024
18. The volume occupied 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 = 22.4dm3 ]
- A. 28
- B. 32
- C. 44
- D. 71
19. Which of the following gases will rekindle a brightly splint?
- B. NO2
- B. NO
- C. N2O
- D. CL2
20. The shape of ammonia molecule is?
- A. Trigonal planar
- B. Octahedral
- C. Square planar
- D. Tetrahedral
21. A few drop of conc HCL are added to about 10cm3 of a solution of PH 3.4. The PH of the resulting mixture is?
- A. less than 3.4
- B. greater than 3.4
- C. unaltered
- D. the same as that of the pure water
22. Chromatography is used to separate components of mixture which differ in their rates of?
- A. diffusion
- B. migration
- C. reaction
- D. sedimentation
23. Deliquescent substances are also?
- A. efflorescent
- B. anhydrous
- C. hygroscopic
- D. insoluble
24. Helium is used in observation of ballons because it is?
- A. Light and combustible
- B. light and non-combustible
- C. heavy and combustible
- D. heavy and non-combustible
25. A gaseous metallic chloride MCl consists of 20.22% of M by mass. The formula of the chloride is?
[ M = 27, Cl = 35.5]
- A. MCl
- B. MCl2
- C. MCl3
- D. M2Cl6
26. 32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm3 of water generated 13.0kj of heat. The heat solution is?
- A. 26.0kj/mol
- B. 65.0kj/mol
- C. 130.0kj/mol
- D. 260.0kj/mol
27. What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
- A. 24,125 C
- B. 48,250 C
- C. 72,375 C
- D. 96,500 C
28. Which of the following types of bonding does not involve the formation of new substances?
- A. Metallic
- B. Covalent
- C. Co-ordinate
- D. Electrovalent
29. Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?
- A. P
- B. Q
- C. R
- D. S
30. The substance often used for vulcanization of rubber is?
- A. Chlorine
- B. Hydrogen peroxide
- C. Sulphur
- D. Tetraoxosulphate(vi) acid
