Jamb Chemistry Past Questions For Year 2018
Question 26
In the preparation of oxygen by heating KCIO\(_3\) , in the presence of MnO\(_2\) only moderate heat is needed because the catalyst acts by \(_2\)
- A. lowering the pressure of the reaction
- B. increasing the surface area of the reaction
- C. increasing the rate of the reaction
- D. increasing the energy barrier of the reaction
Question 27
What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O =16, H = 1]
- A. 0.40 moldm\(^{-3}\)
- B. 0.50 moldm\(^{-3}\)
- C. 0.05 moldm\(^{-3}\)
- D. 0.30 moldm\(^{-3}\)
Question 28
An aqueous solution of a metal salt, M. gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia Therefore the cation in M is
- A. Zn
- B. Ca
- C. Al
- D. Pb
Question 29
The lUPAC name for
- A. 1-methyl pentane
- B. 3-methylbutane
- C. 2-methylbutane
- D. 1-dimethyl propane
Question 30
If one of the following oxides is heated with hydrogen or carbon using a bunsen burner. it is not reduced to the metal, Which one is it?
- A. lead oxide
- B. Magnesium oxide
- C. Copper oxide
- D. Tin oxide
