From the statements given below, the correct option is:
O CO2 is a molecule whereas H2 is an atom
O Aqueous solution of Copper sulphate is a mixture whereas water is a compound
O Vinegar is a compound whereas Baking soda is a mixture
Iron is an element whereas Stainless steel is a compound
Answers
Answer:
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Page No 56:
Question 1:
State whether the following statement is true or false :
Milk is a pure substance.
ANSWER:
False, Milk is not a pure substance. It is a heterogeneous mixture because of its colloidal nature.
Page No 56:
Question 2:
Name three mixtures found in nature.
ANSWER:
Three mixtures found in nature are milk, sweat and air.
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Question 3:
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
ANSWER:
Among the given options, air is a mixture as it is composed of different gases.
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Question 4:
Name one metal and one non-metal which exist as liquids at room temperature.
ANSWER:
Mercury (metal) and bromine (non-metal), exist as liquid at room temperature.
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Question 5:
Name a metal which is soft and a non-metal which is hard.
ANSWER:
Sodium is a soft metal, whereas diamond is a hard non-metal.
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Question 6:
Name a non-metal which is a good conductor of electricity.
ANSWER:
Graphite is a non-metal that is a good conductor of electricity.
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Question 7:
Name a liquid which can be classified as a pure substance and conducts electricity.
ANSWER:
Mercury is a liquid metal that can be classified as a pure substance and a good conductor of electricity.
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Question 8:
Name one solid, one liquid and one gaseous non-metal.
ANSWER:
Carbon is a solid non-metal, bromine is a liquid non-metal and oxygen is a gaseous non-metal.
Page No 56:
Question 9:
Name the property :
(a) which allows metals to be hammered into thin sheets.
(b) which enables metals to be drawn into wires.
ANSWER:
(a) The property of metals that allows them to be hammered into thin sheets is called malleability.
(b) Ductility is the property of metals that enables them to be drawn into wires.
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Question 10:
Which type of elements, metals or non-metals, show the property of brittleness ?
ANSWER:
Any element; metal or non-metal that is soft and cannot be hammered into thin sheets, shows brittleness.
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Question 11:
What is meant by saying that metals are malleable and ductile ?
ANSWER:
Malleability refers to the property of a metal that allows it to be hammered into thin sheets. Ductility refers to the property of metals that allows them to be stretched into thin wires.
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Question 12:
What is meant by saying that non-metals are brittle ?
ANSWER:
Non-metals are brittle in nature, which means, they cannot be hammered into thin sheets. They will be broken into smaller pieces if hammered. E.g., sulphur and phosphorus.
Explanation:
Answer:
b should be correct answer
Explanation:
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