Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
Which of the following equilibria is unaffected by a pressure change?
2NaCI(s) ↔ 2Na (I) + CI2(g)
H 2(g) + I2(g) ↔ 2HI(g)
2O3(g) ↔ 3O2(g)
2NO2(g) ↔ N2O4(g)
Correct answer is B
The equilibrium concentrations of the products and reactants do not directly depend on the total pressure of the system. They may depend on the partial pressures of the products and reactants, but if the number of moles of gaseous reactants is equal to the number of moles of gaseous products, pressure has no effect on equilibrium.
Low temperature and high pressure
High temperature and low pressure
High temperature and high pressure
Low temperature and low pressure
Correct answer is A
conditions that would favour maximum conversion of nitrogen (II) oxide and carbon (II) oxide in the reaction above?
are; i low temperature since the forward reaction is endothermic and backward reaction is exothermic.
ii high pressure since forward reaction involves a reduction in volume and backward reaction involves an increase in volume. ( reaction is in the gaseous phase).
-71.1
-4.18
+71.1
+111.0
Correct answer is A
Q = mct = (50 x 4.18 x 3.4) / (1000)
= 0.71606 kj
1.1 g of \(CaCl_2\) contains
(1.1) / (111) = 0.01 moles of \(CaCl_2\)
If 0.01 liberates 0.7106 quantity of heat.
1 will liberate (0.7106 x 1) / (0.01)
Exothermic = 71.06 = -71.1
increase the surface area of the reactants
increase the concntration of the reactants
lower the activation energy for the reactio
lower the heat of reaction, ∆H, for the reaction
Correct answer is C
As a catalyst, MnO2 lowers activation energy of a reaction.
2H2S(g) + SO2(g) → 3S(s) + 2H2O(I). The above reaction is?
a redox reaction H2S is the oxidant and SO2 is the reductant
a redox reaction in which SO2 is the oxidant and H2S is the reductant
not a redox reaction because there is no oxidant in reaction equation
not a redox because there is no reductant in the reaction equation
Correct answer is B
In the above reaction, H\(_2\)S is oxidized to H\(_2\)O while SO\(_2\) is reduced to S. Hence, H\(_2\)S is the reductant while SO\(_2\) is the oxidant.