1. Oganic solvents are not suited to be heated with one of the followings:
Oil Bath
Electric hot plate
Water bath
Bunsen burner flame
2 Which of the following is not an inflammable liquid ?
Water
Ethanol
Kerosine
Benzene
3 These are some safety precausions necessary in a chemistry laboratory
Wear loose clothings when in the chemistry laboratory
Wear special laboratory goggles when in the laboratory
Do not carry out authorised experiment
When m ixing water and acid, acid is added unto water
4 The first aid for splash of chemical in the eye is------------.
Bathe the eyes with dilute boric acid if the chemical is a base
Bathe the eyes with dilute sodium bicarbonate
Bathe the eyes with large amount of cold water
Bathe the eyes with large amount of hot water
5 Reduction of volume of a solution in an experiment can be achieved by --------.
Freeze drying the solution
Prespitatiog out the solution
Filtering out the solution
Control heat of the solution.
6 Filteration can be defined as a process -----------------------.
of separating two immiscible liquids
of separating solid crystals from the liquid in a solution
of separating two miscible liquid based on their colours
that involves the addition of a precipitants to a solution
7 A precipitated salt can be dried using -------------
Cooling oven
desiccator
Wrapped with filter paper
Heated tungsten wire
8 Which of the following gives the most accurate volume of a measured solution
100ml burette
50 ml burette
25ml burette
10ml burette
9 Which is the most accurate amongst the following measuring devices?
Volumetric flask
Beaker
Pipette
Burette
10 The base unit of a measured or weighed solid material in chemistry is ?
Grams
Pound
Tonne
Kilogram
11 The equivalent of one kilogram is -----------.
106g
105g
104g
103
12 The base unit of a measured liquid called volume is called ?
Millimetre
Centimetre
Cubic metre
Micrometre
13 The base unit for concentration of a substance in chemistry is -----------.
Grammage
Mole
Capacitance
Metre
14 What is a mole of a substance ?
Amount of substance which contains 14.0g of carbon 12 isotope
Amount of substance which contains 13.0g of carbon 12 isotope
Amount of substance which contains 12.0g of carbon 12 isotope
Amount of substance which contains 11.0g of carbon 12 isotope
15 In chemistry, substances react on the basis of ?
Amount in grams equivalent
Amount in volume equivalent
Amount in relative ratios
Amount in moles equivalent
16 An undergraduate student weighed 20g of sodium carbonate salt. If Na=23, O=16, carbon = 12and H=1, what is the mole of the hydroxide?
0.19 mole
0.75mole
0.50mole
0.25mole
17 Which is of higher concentration; 1 molal solution or 1 molar solution
None of the above
1 molal solution
1 molar solution
They are equivalent
18 A solution contains 4 grams of sodium hydroxide in 250ml of solution. If Na=23, O=16 , H=1 and
1cm3
of water weighs1g, what is the concentration of the solution in weight per weight percent?
2.81%
1.92%
1.57%
3.29%
19 A solution contains 4 grams of sodium hydroxide in 250ml of solution . If Na=23, O=16, H=1 and
1cm3
of water weighs 1g, what isthe concentration of the solution in grams per
dm3
?
12
14
16
18
20 What is a standard solution?
Solution that has been weighed
Solution which has a concentration that is accurately known
Solution that has one standard amount dissolved in water
Solution that is very distinct in its properties