30 FREE CHEMISTRY QUESTIONS FOR JAMB, WAEC, NECO AND GCE
30 FREE CHEMISTRY PRACTICE QUESTIONS
ANSMYQUES BLOG
A given mass of a gas has its volume and pressure to by x and y respectively. If the pressure B reduced to on-fourth of the initial, by how much will the volume change? A. x b. 2x c. 3x d. 4x
Given that 32.0g of sulphur contains 6.02x1023 sulphur atoms, how many atoms there in 2.70g of aluminium? [Al=27, S=32] A. 6.02 x 1023 B. 3.01 x 1023 C. 6.02 x 1022 D. 3.1 x 1022
Cr2
The following is impure except: A. soft drink B. Sodium amalgam C. Mercury D. brass
The principal (n), azimuthal (l), magnetic (m) and spin (ms) quantum numbers of the sixteenth electron of calcium is (a) n = 3, l = 2, m = -1, s = -½ (b) n = 3, l = 1, m = -1, s = +½ (c) n = 3, l = 2, m = 0, s = -½ (d) n = 3, l = 1, m = 0, s = +½
The change-to-mass ratio of electrons was detrermined by A. R.A Millikan B. Niels Bolir C. Earnest Rutherford D. J J. Thomson
Which of the following has the highest number of molecules? (a) 8g of oxygen (b) 2g of hydrogen (c) 15g of ammonia (d) 30g of chlorine
What mass of sulphur(iv) oxide is produced when 24g of sulphur reacts with 16g of oxygen. (S=32, O=16). A. 8.0g B. 160g C. 24.0g D. 32.0g
An element that form covalent bond with chlorine is A. Sodium B. Potassium C. Hydrogen D. Magnesium
_____ Is the total number of electrons M shell can accommodate A. 2 B. 8 C. 18 D. 32
How many elements occurred naturally in chemistry A. 82 B. 83 C. 84 D. 85
An element with the atomic number 24 is in the periodic table’s: A. S-block B. P-block C. d-block D. D-block
How many inter-atomic bonds are present in the molecule Na2CO3? A. 1 B. 2 C.3 D. 4
An organic compound contains 79% carbon and 21% of Hydrogen by mass. If the vapour density is 37.5, the molecular formula is ________ A. C5H12 B. C6H14 C. C5H15 D. C6H12
What current in amperes will deposited 12.8g of copper in 2hours 30minutes? [CU=64 F=96500cmol-1] A. 2A B. 2.57A C. 3.0A D. 3.5A
Which of the following changes is accompanied by a positive change in entropy? A. H2(g) + I2(g)
A student wrote the electronic configuration of oxygen as:
1S 2S 2P
The students violated: A. Aufbau’s Principle only B. Hund’s Rule only C. Aufbau and Pauli Exclusion principles D. Hund’s Rule and Aufbau’s Principle
The fact that the two electrons in a degenerate orbital face opposite direction is in accordance with (a) Hund’s rule (b) Auf Bau’s principle
(c) Pauli’s principle (d) Isoelectronic rule
The ratio of the rates of diffusion of two gases E and F is 1:4. If the relative molecular mass of E is 32, Cal. The relative atomic mass of F:A. 64 B. 16 C. 4 D. 128
A seperatory funnel is used to separate components of a liquid mixture which differ in: A. Colour B. Density C. reaction D. diffusion
Which of the following substances can not further decompose ordinarily by chemical means? A. water B. Air C. Sugar D. Silver
2H2S(g) + 3S(g) + 2H2O(l) The reducing agent in the reaction above is _____ A. H2S B. SO2 C. S D. H2O
H3O+(99) + OH-(a9) → 2H2O(l);
Which of the following is a general molecular formula for alkanoate? A. RCOR’ B. RCOOR’ C. RCHO D. RCOOH
The pair of compounds that belong to the same homologous series is: A. C3H6 and C4H8 B. C3H6 and C4H10 C. C3H4 and C4H8 D. C3H6 and C4H6
Butane undergo homologation to produce _________ A. propane B. Pentane C. 2-methypropane D. Butene
Which of the following conditions must be kept for a reaction to be feasible? A. it must be exothermic B. must occur at low temperature C. Entropy must be negative D. Gibb’s free energy must be zero
0.16g of methane when burnt increases the temperature of 100g of water by 40 0C, what is the heat of combustion of methane if the heat capacity of water is 4.2 Jg-1 0C-1? (CH4= 16) A. 1,160 Kjmol-1 B. 1,180 kJmol-1 C. 1,680kJmol-1 D. 1,600 kJmol-1
The determination of heat of combustion is carried out with A. a thermometer B. a bomb calorimeter C. an evaporating dish D. a boiling tube
One of the following statements is false of members of a Homologues A. They conform to the same general molecular formula B. Each successive member differ by a CH2 group C. All members are either liquids or gases D. all members have a uniform functional group
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