हिंदी

Multiple Choice: Which of the Following is Not a Characteristic of a Chemical Change? - Chemistry

Advertisements
Advertisements

प्रश्न

Multiple choice:

Which of the following is not a characteristic of a chemical change?

विकल्प

  •  It is irreversible.

  • No net energy change is involved.

  • New substance is formed.

  •  Involves absorption or liberation of energy.

     

MCQ

उत्तर

No net energy change is involved.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 2: Chemical Changes and Reactions - Exercise 2 (B) [पृष्ठ २९]

APPEARS IN

सेलिना Concise Chemistry [English] Class 9 ICSE
अध्याय 2 Chemical Changes and Reactions
Exercise 2 (B) | Q 12.1 | पृष्ठ २९

संबंधित प्रश्न

When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.


Complete and balance the following chemical equations

Na + H2 O →


Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.

\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]


Define precipitation.


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Compounds, which in their molten state allow an electric current to pass through them are called

  1. electrolytes
  2. non-electrolytes
  3. non-conductors
  4. none of these

What are chemical reactions?


How is precipitate formation in a chemical reaction indicated?


Is kerosene an electrolyte or a non-electrolyte ?


Fill in the blank

A new substance is always formed in a _______ change.


Write true or false .
A black residue is formed when sugar is heated .


Explain the following reaction with one suitable example of Displacement reaction.


Name the type of chemical reaction shown by the following equation :

Fe2O3 + 2Al → Al2O3 + 2Fe


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.


Distinguish by heating the following in dry test tubs.

Copper Sulphate and copper carbonate


What is the role of a catalyst in a chemical reaction?


A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?


The changes in which new substance with new chemical properties are formed are ______.


Classify the following processes into physical or chemical changes:

(i) Beating of aluminium metal to make aluminium foil.

(ii) Digestion of food.

(iii) Cutting of a log of wood into pieces.

(iv) Burning of crackers.


______ occurs in the absence of air and in the presence of micro-organisms such as yeast.


Write the effects of chemical reactions.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×