Pick the change that can be reversed from the following.
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower

Academic Chemistry NCERT Class 6

Correct Answer: (b) Melting of ghee

Explanation: The melting ghee can be frozen again hence this change can be reversed. Cutting of trees, burning of candle and blooming of flower cannot be reversed.

Tutorialspoint

Simply Easy Learning

Updated on: 01-Feb-2023

8 Views

Rolling of chapati and baking of chapati are the changes that(a) can be reversed(b) cannot be reversed(c) can be reversed and cannot be reversed, respectively(d) cannot be reversed and can be reversed, respectively
Salt can be separated from its solution (salt dissolved in water), because(a) mixing of salt in water is a change that can be reversed by heating and melting of salt(b) mixing of salt in water is a change that cannot be reversed(c) mixing of salt in water is a permanent ‘ change(d) mixing of salt in water is a change that can be reversed by evaporation.
Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.
Change of a bud into a flower is a change which cannot be reversed. Give four more such example.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates aphysical change that can be reversedchemical change that can be reversedphysical change that cannot be reversedchemical change that cannot be reversed.
Which of the following change cannot be reversed?Hardening of cementFreezing of ice creamOpening a doorMelting of chocolate
Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
Neutralization reaction is a(a) physical and reversible change(b) physical change that cannot be reversed(c) chemical and reversible change(d) chemical change that cannot be reversed
Give one example in each case:(a) Change which occurs on heating but can be reversed.(b) Change which occurs on heating but cannot be reversed.(c) Change which occurs on cooling but can be reversed.(d) Change which occurs on mixing two substances, but can be reversed.(e) Change which occurs on mixing two substances, but cannot be reversed.
What are the limitations of energy that can be harnessed from the sea?
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Give examples to explain the difference between changes that can or cannot be reversed.
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage- The transfer of pollen from the another to the stigma of a flower is called pollination.If the pollen of a flower lands on the stigma of the same flower, or on the stigma of another flower of the same plant, it is called self-pollination. When the pollen of a flower lands on the stigma of another flower of a different plant of the same kind, it is called cross-pollination.In cross-pollination,(a) the pollen of a flower lands on the stigma of another flower of the same plant.(b) the pollen of a flower lands on the stigma of another flower of a different plant of the same kind.(c) both the above are correct.(d) none of these is correct.
Counting the number of palindromes that can be constructed from a string in JavaScript
A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens.(a) At what distance from the film should the lens be adjusted to obtain a sharp image of the flower?(b) What would be the diameter of the image of the flower on the film?(c) What is the nature of camera lens?

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements