Question 1 : (Experimental value – True value)/Error is equal to X. X is
answer
Error value
Question 2 : If the boiling point will change by approximately 0.5 degree Celsius for each 20mm change in pressure, what will be the boiling point of ethanol at 700mmHg when its normal point at 760mmHg is known to be 78.3 degrees Celsius?
answer
75.3 degree Celsius
Question 3 : Swhich of the following is less dense than water?
answer
Ethylacetate
Question 4 : More polar elements in a molecule tends to __________ of the molecule.
answer
increase the boiling point
Question 5 : 100 degree Celsius is the literature value of the boiling point of water but in practice is it possible for water to boil at 85 degree Celsius?
answer
No
Question 6 : The solid and liquid phases of a solid in equilibrium defines _________ point of the solid
answer
melting
Question 7 : Practically it is very difficult to quantify the _________ point of a substance.
answer sublimation
Question 8 : Which of these stops molecules from packing together?
answer
Polarization
Question 9 : A bottle contains 4.59 centimeters cube of X. The total mass of the bottle is 35.66g. The empty bottle weighs 14.23g. What is the density of X?
answer
4.67 grams per centimeters cube
Question 10 : One of the following is the most commonly used extraction solvent
answer
Ethyl acetate
Question 11 : Which of these would happen when a liquid is placed in temperature far below its solidifying point?
answer
It over solidifies
Question 12 : What is the relationship between the true value and the error of an experiment?
answer
inversely
Question 13 : For a good scientist there must be an ideal solvent system for each extraction.
answer Correct
Question 14 : Which of these solvents has the lowest boiling point ?
answer
Ethylether
Question 15 : A liquid X has a normal boiling point of 75 degree Celsius. What will be the approximate boiling point of the liquid at 800mmHg?
answer
79 degree Celsius
Question 16 : Why is methanol not suitable for extracting aqueous solutions?
answer
It has high melting point
Question 17 : A cylinder is filled to the 38ml mark with oil. The masses of the cylinder before and after addition of the oil are 125g and 150g. Determine the density of the oil.
answer
0.86g/ml
Question 18 : A cube of iron has a mass of 0.630kg. What is the length of each side if density of iron is 8.9 grammes per centimeter cube?
answer
4.13cm
Question 19 : Error value of an experiment is __________ proportional to its experimental value.
answer
inversely
Question 20 : In most solid, melting and freezing point is the same.
Answer
Absolutely false
Start the discussion…the principle of separation of insoluble solid from a liquid by filtration is based on what
Decantation