CBT Chemistry JAMB 2017

1 The general formula of alkanones is

2 The constituent common to duralumin and alnico is

3 The shape of the S-orbital is

4 Aluminium hydroxide is used in the dyeing industry as a

5 The tincture of iodine means iodine dissolved in

6 Temporary hard water is formed when rain water containing
dissolved carbon(IV) oxide flows over deposits of

7 The acid anhydride that will produce weak acid in water is

8 The process that occurs when two equivalent forms of a
compound are in equilibrium is

9 In the laboratory preparation of ethyl ethanoate, the water
present in the mixture is removed using a solution of

10 The constituent of air necessary in the rusting process are

11 For a general equation of the nature xP + yQ → mR + nS, the
expression for the equilibrium constant is

12 A given mass of gas occupies 2dm 3 at 300k. At what
temperature will its volume be doubled, keeping the pressure
constant?

13 The oxidation number of iodine in KIO 3 is

14 An isomer of C5 H12 is

15 When few drops of concentrated trioxonitrate(V) acid is
added to an unknown sample and wanned an intense yellow
colouration is observed. The likely functional group present in
the sample is

16 A sample of orange juice is found to have a PH of 3.80. What
is the concentration of the hydroxide ion in the juice?

17 Incomplete oxidation of ethanol yields

18 The salt formed from a weak acid and a strong base
hydrolyzes in water to form

19 The ideal gas laws and equations are true for all gases at

20 When ΔH is negative, a reaction is said to be

21. The answer is:

22 The shape of ammonia molecules is

23 The mass of silver deposited when a current of 10A is passed
through a solution of silver salt for 4830s is – (Ag = 108 F =
96500(mol^-1 )

24 Tin is unaffected by air at ordinary temperature due to its

25 Calculate the amount in moles of silver deposited when
9650C of electricity is passed through a solution of silver salt [=
96500 Cmol^-1 ]

26 The reaction of halogens in the presence of sunlight is an
example of

27 The enzyme used in the hydrolysis of starch to dextrin and
maltose is

28 The alkyl group is represented by the general formula

29. CH 2 S (g) + O 2(g) → 2Cn + SO 2(g)

What is the change in the oxidation number of copper in the reaction?

30. In the diagram above. X is

31. The diagram above. Y is

32 Calculate the mass of copper deposited when a current of 0.5
ampere was passed through a solution of copper(II) chloride for
45 minutes in an electrolytic cell. [Cu = 64, F = 96500Cmol^-1 ]

33. C 3 H 5 – COH 3 =CH 2
The IUPAC nomenclature of the structure above is

34 The reddish–brown rust on ion roofing sheets consists of

35 The densities of two gases, X and Y are 0.5gdm -3 and
2.0gdm -3 respectively. What is the rate of diffusion of X relative
to Y?

36 The carbon atoms on ethane are

37 According to Charle’s law, the volume of a gas becomes zero
at

38 An oxide XO 2 has a vapour density of 32. What is the atomic
mass of X?

39 The gas that can be collected by downward displacement of
air is

40 In the laboratory preparation of trioxonitrate (V) acid the
nitrogen(iv) oxide formed as a by-product is removed by

41 A particle that contains a protons, 10 neutrons and 10
electrons is

42 Ethene is prepared industrially by

43 Calculate the amount in moles of a gas which occupies 10.5
dm^3 at 6 atm and 30 degrees C [R = 082 atm dm^3 K^-1 mol^-1 ]

44 If 100cm^3 of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16, H = 1]

45 Due to the high reactivity of sodium, it is usually stored under

46 The furring of kettles is caused by the presence in water of

47 Water for town supply is chlorinate to make it free from

48 Ca(OH) 2(s) + 2NH 4 Cl (g) → CaCl 2(s) + 2H 2 O 2(l) + X. In the
reaction above X is

49 X (g) + 3Y (g) —- 2z (g) H = +ve. if the reaction above takes
place at room temperature, the G will be