a suspension of chalk cannot be separated is it true or false? explain your answer
Answers
Answer:
Living Science Solutions for Class 6 Science Chapter 5 Separation Of Substances are provided here with simple step-by-step explanations. These solutions for Separation Of Substances are extremely popular among Class 6 students for Science Separation Of Substances Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Living Science Book of Class 6 Science Chapter 5 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Living Science Solutions. All Living Science Solutions for class Class 6 Science are prepared by experts and are 100% accurate.
Page No 55:
Question 1:
Most of the substances we see around us are
(a) pure elements.
(b) pure compounds.
(c) impure elements.
(d) mixtures.
ANSWER:
(d) mixtures
Most of the substances we see around us are mixtures of different elements and compounds.
Page No 55:
Question 2:
A solution of salt in water is a
(a) compound.
(b) homogeneous mixture.
(c) heterogeneous mixture.
(d) element.
ANSWER:
(b) homogeneous mixture
When salt is dissolved in water, the salt is distributed uniformly in the solution. Thus, the salt solution is a homogeneous mixture.
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Question 3:
The property used in separating a mixture of two solids by winnowing is
(a) difference in colour.
(b) difference in size.
(c) difference in weight.
(d) attraction by magnet.
ANSWER:
(c) difference in weight
Winnowing is used to separate two solids of different weights, such as wheat and chaff.
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Question 4:
The process of settling down of particles of a solid in a liquid is
(a) decantation.
(b) sublimation.
(c) sedimentation.
(d) filtration.
ANSWER:
(c) sedimentation
The process of settling down of particles of a solid in a liquid is known as sedimentation.
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Question 5:
Which method is used to obtain a pure liquid from a solution?
(a) distillation
(b) condensation
(c) filtration
(d) loading
ANSWER:
(a) distillation
Distillation can be used to obtain a pure liquid from a solution.
Page No 56:
Question 6:
The temperature of a saturated solution of sugar in water is raised by 10 °C. Which of these statements is now true?
(a) It will continue to be saturated.
(b) It will become unsaturated.
(c) Whether it remains saturated or becomes unsaturated depends on the amount of water taken.
(d) It will continue to be saturated, but if the temperature is increased beyond 10 °C it will become unsaturated.
ANSWER:
(b) it will become unsaturated
If the temperature of saturated sugar solution is increased by 10 oC, then more sugar can be dissolved in the solution and the solution becomes unsaturated.
Page No 56:
Question 7:
Which of the following can dissolve in water?
(a) only solids
(b) only solids and liquids
(c) solids, liquids and gases
(d) only liquids
ANSWER:
(c) solids, liquids and gases
Solids such as salt, liquids such as alcohol and gases such as nitrogen and oxygen can dissolve in water.
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Question 8:
Sedimentation and decantation are useful to separate
(a) immiscible liquids.
(b) soluble solid from liquid.
(c) insoluble solid from liquid.
(d) insoluble solid from a liquid where the solid is heavier than the liquid.
ANSWER:
(d) insoluble solid from a liquid where the solid is heavier than the liquid
Decantation and sedimentation can be used to separate solids from a liquid when the solid is heavier than the liquid and is insoluble in the liquid.
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Question 9:
A commonly used chemical for loading is
(a) hydrogen.
(b) alum.
(c) sulphur.
(d) common salt.
ANSWER:
(b) alum
Alum is a commonly used chemical for loading to speed up sedimentation.
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Question 10:
To get only the pure solid from its solution in water, which method will you use?
(a) evaporation
(b) distillation
(c) filtraction
(d) none of these
ANSWER:
(a) evaporation
Evaporation is the process used to get a pure solid from its solution in water.
Page No 56:
Question 1:
There are very few pure elements or compounds around us. Most substances are mixtures. True or false?
ANSWER:
True, most of the substances around us exist in the mixed state and not as pure elements or compounds.
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Question 2:
The constituents of all mixtures are uniformly spread throughout the mixtures. True or false?
ANSWER:
False, the constituents of a heterogeneous mixture are not uniformly spread throughout the mixture.
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Question 3:
Is a solution of sugar in water homogeneous or heterogeneous?
ANSWER:
In case of a sugar solution, the sugar is distributed uniformly in the water. Thus, sugar solution is a homogeneous solution.
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Question 4:
Name one property of a compound that remains fixed and can be used to test if the compounds has impurities in it.
ANSWER:
The melting point and boiling point are two properties of a compound that can be used to test its purity as they remain fixed.
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