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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ७

True or False. If false, give the correct answer. Tarnishing of silver is an example of endothermic change. - Science

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प्रश्न

True or False. If false, give the correct answer.

Tarnishing of silver is an example of endothermic change.

विकल्प

  • True

  • False

MCQ
सत्य या असत्य

उत्तर

False

Tarnishing of silver is an example of change.

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अध्याय 3: Changes Around Us - Evaluation [पृष्ठ ५३]

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सामाचीर कलवी Science - Term 2 [English] Class 7 TN Board
अध्याय 3 Changes Around Us
Evaluation | Q III. 5. | पृष्ठ ५३

संबंधित प्रश्न

FILL IN THE BLANK 

In a................ reaction heat energy is absorbed.


Complete the following statement.

On heating, hydrated copper sulphate changes its colour from ________ to __________.


Chemical reactions may proceed with evolution of heat. Give an example.


Explain the term energy changes in a chemical change or reaction.


Supply of energy may be required to initiate a reaction. State the different forms with a suitable example of reactions initiated by the supply of energy.


Complete the statement by filling in the blank with the correct word:

The reaction of hydrogen burning in oxygen to give a neutral liquid is an example of ________ reaction.


Select the correct answer from the options given below:

State the gaseous product formed, when

An exothermic reaction takes place between ammonia and neutral gas.


Complete the following table:

Chemical Reactions Name reaction type
\[\ce{C(s) + O2(g) -> CO2(g)}\] (a) ________
\[\ce{Zn(s) + CuSO4(aq) ->}\] (b) _________ Displacement reaction
\[\ce{2Cu(s) + O2(g) ->[heat] 2CuO(s)}\] (c) _________
\[\ce{C(s) + 2H2(g) -> CH4(g)}\] (d) _________
\[\ce{CaO(s) + H2O(l) -> Ca(OH)2(aq) + heat}\] (e) _________
\[\ce{CaCO3(s) + Heat ->}\] (f) _________ Endothermic Reaction

Give scientific reasons.

While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.


Give scientific reason.

While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.


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