30 FREE CHEMISTRY QUESTIONS FOR JAMB, WAEC, NECO AND GCE

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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

 

  • Cr2O72-+ 3SO2​​ + XH+2Cr3+​​ + 3H2SO42-​​ + H2O in the redox reaction above, the value of X is ____  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ A. 3  ​​ ​​​​ B. 5  ​​ ​​​​ C. 6  ​​​​ D. 2

 

  • 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

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  • 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)​​ 2HI(g) ​​ ​​ ​​ ​​​​ ​​ B. CaCo3(s)CaO(s) + O2(g)​​ C. 2NO2(g) →​​ ​​ N2O4(g)​​  ​​​​  ​​ ​​ ​​ ​​ ​​​​ D. H2O(l) →​​ H2O(s)

 

  • 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​​ 

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(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);​​ H= -xkJ​​ H in the reaction above is the heat of: ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ A.​​ Formation ​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ ​​ B. Combustion  ​​​​ C. solution  ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ D. Neutralization

 

  • 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

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  • 0.16g of methane when burnt increases the temperature of 100g of water by 40​​ C, what is the heat of combustion of methane if the heat capacity of water is 4.2 Jg-1​​ C-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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