CHM201
1. When the cocentration is plotted against time, the reaction rate at time t, is obtained from?
intercept on the time axis
calculation
—>> slope of the graph
intercept on the concentration axis
Zn^{2+} + 2e- → Zn which of the specie in this equation is a reducing agent?
$$Zn_{2}$$
—>> Zn
2e
Zn^{2+}
What constant always refers to the equilibrium in which a base reacts with water to form the corresponding conjugate acide and base?
Kc
Qc
Qb
—>> Kb
Calculate ΔG^{o} in KJ for the reaction with standarded enthalpy change of -200KJ and standarded entropy change of -189J/K?
—>> 144.24
-144.24
255.75
_25.58Kj
What is the concentration of a solution of KOH for which the pH is 11.89?
$$7.8 X 10^{-9}$$ M
9.8 X 10-3 M
$$ 8.7 X 10^{-9}$$ M
—>> $$7.8 X 10^{-3 }$$ M
Calculate the mass of copper metal in kilogram deposited when a 6.0 ampere of current is passed through its salt solution for 1 hr 15 minutes (1F =96500C, Cu = 63.5g)?
17.77kg
0.15kg
0.30kg
—>> 0.00888kg
A gas at pressure pin in a cylinder fitted with an air tight piston is an example what process?
cyclic
adiapatic
—>> reversible
irreversible
The reaction in which the rate of reaction is independent of the concentration of reactant species is known as?
—>> zero order
first order
second order
third order
Which of the following salts below increase the solubility of /(PbNO_{3})/?
NaNO3
KNO3
PbCl2
—>> KCl
The major sources of indicator is?
inorganic substance
—>> organic substance
inorganic dyes
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