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

ink

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