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Standard VII
Chemistry
Physical Change
Question

Which of the following is a physical change?
a) Hammering of a red hot iron rod to make a flat sheet.
b) Formation of ice by cooling of water.
c) Rising of water vapors from sea to make clouds.
d) Heating of charcoal in the air to high temperature till it begins to flow.
  1. a, b and c
  2. b, c and d
  3. c, d and a
  4. d, a and b

A
b, c and d
B
d, a and b
C
a, b and c
D
c, d and a
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Solution
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The correct option is A a, b and c
a, b, and c represent physical changes and d represents chemical changes.
Physical changes:
a) Hammering of a red hot iron rod to make a flat sheet.
b) Formation of ice by cooling of water.
c) Rising of water vapors from sea to make clouds.

Chemical changes:
d) Heating of charcoal in the air to high temperature till it begins to flow.

Note: During a physical change, there is no change in the nature of the substance. However, during a chemical change, a chemical reaction converts one substance into another with energy being either released or given out.

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Similar Questions
Q1
Which of the following is a physical change?
a) Hammering of a red hot iron rod to make a flat sheet.
b) Formation of ice by cooling of water.
c) Rising of water vapors from sea to make clouds.
d) Heating of charcoal in the air to high temperature till it begins to flow.
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Q2

Classify the following as physical and chemical changes:
(i) Cleaning with soap and water
(ii) Cooking chicken
(iii) Formation of clouds
(iv) Making of ice cubes


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Q3
Assertion :Evaporation occurs on the surface of liquid and it is a vaporization of liquid. It is a state of transition from liquid to gaseous state. Reason: Evaporation occurs when there is exposure of water to air and water molecules change into vapor and these vapors rise up and form clouds.
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Q4
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water.
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Q5
In a dew point apparatus, a metal beaker is cooled by gradually adding ice water to the water initially at room temperature. The moisture from the room air begins to condense on the beaker when its temperature is 12.8∘C. If the room temperature is 21∘C and the barometric pressure is 1.01325 bar, determine the parts by mass of water vapor in the room air?
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