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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