CHM202: Analytical Chemistry I TMA1

Question 1 : The change in colour of an indicator used in volumetric analysis is due to ____________________ .
A. End point of the titration reaction
B. Change in the current between a pair of electrodes
C. Complete consumption of analyte near the equivalence point whose concentration is known
D. Change of pH in the titration of an acid with a base

ANSWER TO QUESTION 1 IS A. End point of the titration reaction

Question 2 : A certain portion of a whole that is removed through any of the sampling methods, which correspond to the whole lot both in chemical composition and in particle size distribution is known as ___________ .
A. Integrated sample
B. Laboratory size sample
C. Gross sample
D. Composite sample

ANSWER TO QUESTION 2 IS C. Gross sample

Question 3 : Grab samples are ___________.
A. Single samples collected at specific spot at a site over a short period of time
B. Samples collected at more than one specific spot at a site over a short period of time
C. Samples collected at specific spot at a site over a short period of time
D. Single samples collected at more than one specific spot at a site over a short period of time

ANSWER TO QUESTION 3 IS A. Single samples collected at specific spot at a site over a short period of time

Question 4 : ____________ consists of a collection of numerous individual discrete samples taken at a regular intervals over a period of time, thus representing sampling of heterogeneous matrices in which the composition of the analyte of interest may vary over a period of time or space.
A. Gross samples
B. Grab samples
C. Integrated samples
D. Composite samples

ANSWER TO QUESTION 5 IS D. composite sample

Question 5 : Which of the following options is suitable when the source of a sample is known to vary with time or when source composition varies in space
A. Gross samples
B. Composite samples
C. Integrated samples
D. Grab samples

ANSWER TO QUESTION 5 IS D. Grab samples

Question 6 : Laboratory size sample is obtained from ___________
A. Gross sample
B. Composite sample
C. Population or whole
D. Integrated sample

ANSWER TO QUESTION 6 IS A. Gross sample

Question 7 : Which sample consist of mixture of grab samples collected from different points simultaneously or as nearly so as possible.
A. Grab sample
B. Gross sample
C. Composite sample
D. Integrated sample

ANSWER TO QUESTION 7 IS D. Integrated sample

Question 8 : Depth integrated samples are _______________.
A. Samples taken at selected locations depth over a short period of time
B. Samples collected over a predetermined part of an area with respect to location and time
C. Snap samples
D. Samples collected over a predetermined part or to entire depth of an area with respect to location and time

ANSWER TO QUESTION 8 IS D. Samples collected over a predetermined part or to entire depth of an area with respect to location and time

Question 9 : Discrete grab samples are _______________.
A. Samples taken at a selected location depth and time
B. Single samples taken at a selected location depth and time
C. Snap samples
D. Samples taken at selected locations depth over a short period of time

ANSWER TO QUESTION 9 IS A. Samples taken at a selected location depth and time

Question 10 : Gross sample is obtained from ___________.
A. Composite sample
B. Population or whole
C. Environment
D. Integrated sample

ANSWER TO QUESTION 10 IS A. Composite sample