Testing
The Earth
MC Question
- Why can gases in air be separated by fractional distillation of liquid air?
- The gases have different boiling points.
- The gases have different melting points.
- The gases have different chemical properties.
- The gases have different percentages in air by volume.
- What colour can be observed when a sample of sodium chloride solid is heated in a Bunsen flame?
- Blue
- Golden Yellow
- Green
- Lilac
- Which of the following gas(es) is/ are least likely to be found in air?
- Nitrogen
- Noble gases
- Hydrogen
- Carbon dioxide
- Which of the following substances is the most abundant in dry air?
- Methane
- Oxygen
- Carbon Dioxide
- Nitrogen
- What colour can be observed when a sample of limestone is heated in a Bunsen flame?
- Lilac
- Brick red
- Blue
- Green
- We test oxygen with (X), the expected observation is (Y)
- X : acidfided potassium permanganate solution
Y : the solution changes to colourless - X : a glowing splint
Y : the glowing splint relights - X : lime water
Y : the solution turns milky - X : damp blue litmus paper
Y : the paper turn red and then white
- X : acidfided potassium permanganate solution
- Which of the following statements is correct?
(1) Air is a mixture of two gases, nitrogen and oxygen.
(2) The gases in air are highly unreactive.
(3) The composition of air may vary slightly from time to time.- (1) only
- (3) only
- (1) and (3) only
- (2) and (3) only
- Which of the following is the correct procedure to change calcium carbonate to limewater?
- Heating strongly, adding water, and then filtering off the solid suspension.
- Heating with plenty of water and then leave it for a few minutes
- Heating and then adding in plenty of dilute acid.
- Adding plenty of water with carbon dioxide and then heating.
Consider the experimental set-up above, Which of the following combinations concerning the functions of X and Y is correct?- X:To speed up distillation
Y:To condense vapour - X:To ensure even boiling
Y:To condense vapour - X:To speed up distillation
Y:To remove impurities - X:To ensure even boiling
Y:To remove impurities
- X:To speed up distillation
- A student wants to prepare a crystal of sodium chloride. He/she first heats a solution of sodium chloride to boil some water away. Which of the following procedures can be used to check whether the solution is concentrated enough for crystallization?
- Taste it.
- Observe if the solution is mliky.
- Dip a glass rod into the solution, take it out to see if small crystals appear on the rod.
- Measure the volume of the solution to see if it is half of the initial volume.
- Which of the following arrangements enhances the cooling effect of Liebig condenser in a distillation set-up?
- Water remains stagnant in the Liebig condenser.
- Water runs downwards across the Liebig condenser.
- Water runs upwards across the Liebig condenser.
- Water runs up and down repeatedly across the Liebig condenser.
- Which of the following substances will NOT be obtained in the electrolysis of sea water?
- Hydrogen
- Sodium hydroxide
- Oxygen
- Chlorine
- Which of the following elements can be identified easily by flame test?
- Nitrogen
- Potassium
- Chlorine
- Oxygen
- When marble is heated, a gas is evolved. Which of the following statements concerning the gas evolved is correct?
- The gas is pale green in colour.
- The gas relights a glowing splint.
- The gas turns limewater milky.
- The gas turns bromine water colourless.
- Which of the following is the industrial method of manufacturing oxygen?
- Electrolysis of water
- Fractional distillation of liquid air
- Photosynthesis
- Heating silver oxide
- Which of the following is NOT a common use of carbon dioxide?
- It can be used to make fire extinguishers.
- It is put into soft drinks.
- It is used to fill light bulbs.
- It is used as a refrigerant.
- When acidified silver nitrate solution is added to magnesium chloride solution, a white precipitate is formed. The white precipitate is
- magnesium nitrate
- silver chloride
- silver
- magnesium
- Which of the following statements about sea water is correct?
- It turns a dry blue cobalt chloride paper pink.
- It turns a dry pink cobalt chloride paper blue.
- It turns a moist pink cobalt chloride paper blue.
- It turns a moist blue cobalt chloride paper pink.
- Which of the following concerning nitrogen is INCORRECT?
(1) It is flammable.
(2) It is a liquid at room temperature.
(3) It is the most abundant component in the Earth atmosphere.- (1) and (2) only
- (1) and (3) only
- (2) and (3) only
- (1), (2) and (3)
- Who am I?
- FY
- MY
- BY
- GA
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