JAMB REVIEW TEST # 1

Compiled from UME Chemistry past questions

By Kingsley Idiagbor, B.Sc. (Hons), NCE, PGDCs, MNSM

1. The correct name of the compound with the above structural formula is:
   
   (A) 2-methylbut-1-ene (B) 2-methylbut-2-ene (C) 2-ethylbut-1-ene (D) 2-ethylprop-1-ene (E) 2-ethylprop-2-ene [UME 1983 Q.19]
2. 2.5g of a hydrated barium salt gave on heating, 2.13g of the anhydrous salt. Given that the relative molecular mass of the anhydrous salt is 208, the number of molecules of water of crystallization of the barium salt is -(A) 10 (B) 7 (C) 5 (D) 2 (E) 1 [UME 1983 Q.36]
3. 3.06g of a sample of potassium trioxochlorate (V), KClO₃ was required to make a saturated solution with 10cm³ of water at 25^oC. The solubility of the salt is 25^oC is ---(K=39 Cl=35.5 O=16] (A)5.0mol dm^-3 (B) 3.0 mol dm^-3 (C) 2.5 mol dm^-3 (D) 1.0 mol dm^-3 (E) 0.5 mol dm^-3 [UME 1983 Q.37]
4. 20cm³ of hydrogen gas are sparked with 20cm³ of oxygen gas in a eudiometer at 373K (100^o C) and 1 atm. The resulting mixture is cooled to 298K (25 ^oC) and passed over calcium chloride. The volume of the residual gas is (A) 40cm³ (B) 20cm³ (C) 30cm³ (D) 10cm³ (E) 5 cm³ [UME 1984 Q.2]
5. For the reaction NH₄NO₃ -->N₂ + H₂ calculate the volume of nitrogen that would be produced at STP from 3.20g of the trioxonitrate (III) salt. (A) 2.24dm³ (B) 2.24cm³ (C) 1.12cm³ (D) 1.12 dm³ (E) 4.48dm³ (Relative atomic mass: N=14 O=16 H=1) [UME 1984 Q. 3]
6. In an experiment, copper tetraoxosulphate (VI) solution was electrolyzed using copper electrodes, the mass of copper deposited at the cathode by the passage of 16000 coulombs of electrolysis is….(A) 16.7g (B) 17.6g (C) 67.1g (D) 10.67g (E) 60.17g (Relative atomic mass: Cu=63.5 O=16 H=1 S=32) [UME 1984 Q. 37]
7. 0.49g of CuSO₄, xH₂O when heated to constant weight gave a residue of 0.346g. The value of x is --------(A)0.5 (B) 2.0 (C) 3.0 (D) 4.0 (E) 5.0 [UME 1985 Q. 4]
8. Copper sulphate solution is electrolyzed using platinum electrodes. A current of 0.193 amperes is passed for 2 hrs. How many grammes of copper are deposited? (A) 0.457g (B) 0.5g (C) 0.882g (D)0.914g (E) 1.00g (Cu=63.5, F=96500 coulombs) [UME 1985 Q. 17]
9. The number of atoms of chlorine present in 5.85g of NaCl is---(A) 6.02 x 10²² (B) 5.85 x 10²³ (C) 6.02 x 10²³ (D) 5.85 x 10²⁴ (Na=23 Cl=35.5)[UME 1986 Q. 4]
10. The IUPAC name for the compound: is
    
    (A) 2-methyl-3-pentene (B) 4-methyl-2-pentene (C)2-methyl-2-pentene (D) 4-methyl-3-pentene (E) 2-methyl-3-pentane [UME 1985 Q.35

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