WorksheetsSS3 JAMB PRACTISE
Total questions: 20
Worksheet time: 9mins
The two types of bonds that exist in NH4+ are
covalent and ionic
dative and covalent
dative and ionic
hydrogen bond and electrovalent
Mg + 2HCl → MgCl2 + H2. In the equation above, 8g of magnesium reacts with excess acid. What volume in dm3 of hydrogen is evolved? (Mg = 24, H = 1, Cl = 35.5, volume of gas at s.t.p = 22.4dm3)
3.74
7.47
10.47
67.20
0.9g of calcium trioxocarbonate (IV) was added to excess dilute hydrochloric acid. The entire reaction took 3 mins. What is the rate of reaction in gmin-1?
3.9
3.3
2.7
0.3
The oxidation number of P in H3PO4 is
+3
+4
+5
+6
An element with the electronic configuration 1s22s22p63s23p2 belongs to group
II
III
IV
VI
44g of CO2 contains 6.02 x 1023 molecules. Calculate the number of molecules in 5.6dm3 of the gas at s.t.p.{1 mole of a gas occupies 22. 4dm3at s.t.p}
0.102 x 1023
1.016 x1023
1.506 x 1023
2.409 x 1024
Which of the following expression represents Charles’ law?
K = P/V
PV = K
PV = nRT
V = KT
Which of the following is a basic salt?
Ba(NO3)2
Ca(HCO3)2
Na2SO3
Zn(OH)Cl
What mass in grams of magnesium oxide is deposited when 4.2g of magnesium trioxocarbonate (IV) is heated strongly? [ Mg = 24, C= 12, O = 16]
0.2
0.4
2.0
4.0
What mass in grams of sodium trioxocarbonate (IV) is in 500cm3 of 0.1 mol dm-3 of its solution?
(Na = 23, O = 16, C = 12)
4.6
5.3
10.0
10.2
In the reaction, N2(g) + 3H2(g) ⇌ 2NH3(g) - Which of the following will factors will increase the rate of formation of ammonia?
Decrease in pressure
Increase in pressure
Increase in temperature
Removal of hydrogen
The volume in dm3 of CO2 liberated by 25g of CaCO3 when heated strongly is
(Ca = 40, C = 12, O = 16)
22.4dm3
11.2dm3
5.6dm3
2.8dm3
The notation ΔHf° represents
enthalpy change of formation.
heat change of formation
standard entropy of formation
standard heat change of formation
The minimum amount of energy required for a reaction to take place is known as
activation energy
enthalpy
entropy
heat of reaction
The general formula of an alkyl halide is
CnH2n X
CnH2n+1 X
CnH2n + 2X
CnH2n-1X
The following are condensation polymers EXCEPT
nylon
Perspex
phenol – methanal
terylene
Which of the following reactions will a compound with a general molecular formula CnH2n + 2 undergo?
Addition
Esterification
Hydrogenation
Substitution
What is the major product formed when CH3COOH and C2H5OH reacts?
C3H8COOH
CH3COOC2H5
CH3CH2COOCH3
CH3COC2H5
Helium atoms are chemically unreactive because
the atoms contain only protons
the number of protons equals the number of electron
the outer electrons shell is completely filled
there are equal number of protons and neutrons
An isotope of hydrogen which forms heavy water is
deuterium
positron
protium
proton
