Which of the following is not an inflammable

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Reference no: EM13838402

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
?

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

Reference no: EM13838402

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