PAST QUESTIONS ON ERRORS

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Questions

The molar concentration in moldm`3 of a solution is determined by four separate titrations,the results being

0.2041,0.2049,0.2039, and 0.2043

Use the above data to answer questions 1-3

1.Calculate the mean and mean respectively

a)0.2043,0.2042

b)0.2045,0.2042

c)0.2042,0.2045

d)0.2043,0.2042

Ans; D

2.Calculate the average deviation and relative average deviation respectively

a)0.003,160ppt

b)0.0003,0.15ppt

c)0.0002,1.5ppt

d)0.0003,15ppt

Ans;

3.Calculate the standard deviation and coefficient of variation respectively

a)0.0004,2%

b)0.004,0.2%

c)0.0004,0.2%

d)0.0004/0.02%

Ans: C

4.What is the relative rate of diffusion for hydrogen molecules compared to those of oxygen molecules at the same temperature?

a)2

b)6

c)8

d)4

Ans; D

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5.One of these is not a magic number

a)2

b)12

c)50

d)20

Ans;B

6.The sign of entropy change of a reaction for a reaction

NH4CL(s)———–NH3+HCL

a)Zero

b)Positive

c)Unchanged

d)Negative

Ans;B

7.A nuclei represented by ¹²ⁿX is likely to decay by

a)Proton emitter

b)Electron capture

c)Stable nuclei

d)Positron emitter

Ans;D

8.Which of the following does not affect position of equilibrium I a chemical reaction?

a)Pressure

b)Catalyst

c)Temperature

d)Concentration.

Ans;B

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9…………acid has three replaceable hydrogen ions

a)Triprotic

b)Monoprotic

c)Diprotic

d)Tetraprotic

Ans;A

10.Find the POH of a water sample with OH concentration of 1.47×10^-6

a)8.83

b)10.9

c)6.80

d)5.17

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Ans;A

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CHEMISTRY 101.

Questions;

1.The degree of closeness between replicate set of measurements or analysis is called?

a)Error.

b)Determinate error .

c)Precision.

d)Accuracy.

• Ans; C

2.Determinate errors can be minimized my any of the following except

a)Running a blank determination.

b)Running parallel determination.

c)Calibration of apparatus.

d)Use of external standard.

Ans; D

3.The error committed by an analyst who claimed not to observe any color in methyl orange indicator during acid-base titration is?

a)Indeterminate

b)Determinate,methodical

c)Determinate,Instrumental

d)Determinate,Personal.

Ans;D

4……………..is the departure of the result from the true value

a)Precision

b)Accuracy

c)Error

d)Bias

Ans; C

5……………Is the trueness or the closeness of the analytical result to the true value

a)Precision

b)Relative error

c)Bias

d)Accuracy

Ans; D

6. The result obtained from the operation 38.91×(6.81-6.730) is y.The value of y is ……

a)3.1128

b)3.11

c)3.113

d)3

Ans; B

7)…………..is called the size of the orbital?

a)Energy level

b)Sub-shell

c)Quantum number

d)shell

Ans; D

8.In the arrangements of electrons in an orbital,electrons are arranged singly before pairing commences.Which law is obeyed?

a)Pauli’s

b)Hund’s

c)Dalton’s

d)Bohr’s model

Ans; B

9.In electro negativity ………..effect is produced.

a)Inducive

b)Inductive effect

c)Ionic

d)Electronic

Ans; B

10……….discovered Neutron

a)Milikan

b)Chadwick

c)Rutherford

d)Newton

Ans; B

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