What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O
1
6
8
12
Correct answer is B
No explanation has been provided for this answer.
Which of the following will displace copper from a solution of copper (ll) salt?
Aluminium ions
Magnesium
Silver
Zinc ions
Correct answer is B
No explanation has been provided for this answer.
A finely divided from of a metal burns more readily in air than the rod from because the rod has
higher molar mass
smaller surface area
protective oxide coating
diferent chemical properties
Correct answer is B
No explanation has been provided for this answer.
Decreases the value of ∆H
Increases the collision rate of reactant particles
Shifts equilibrium position to the right
Reduces the time for attainment of equilibrium
Correct answer is D
In the contact process above; a temperature of about 500ºC and use of Vanadium(V)Oxide catalyst increase the reaction rate and enable equilibrium to be reached in a shorter time.
Chemical equilibrium is attained when
reactants in the system are used up
concentrations of the products are greater than those of the reactants
concentrations of the reactants and products remain constant
reactants stop forming the products
Correct answer is C
No explanation has been provided for this answer.