मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Name the Type of Chemical Reaction Shown by the Following Equation: 2mg + O2 → 2mgo - Chemistry

Advertisements
Advertisements

प्रश्न

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

2Mg + O2 → 2MgO

एका वाक्यात उत्तर
Advertisements

उत्तर

2Mg + O2 → 2MgO  => Combination reaction.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 5: Language of Chemistry - Additional questions

APPEARS IN

सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Additional questions | Q 8.2

संबंधित प्रश्‍न

How do the following help in bringing about a chemical change?

pressure.


Complete and balance the following chemical equation:

\[\ce{Pb(NO3)2 ->[Heat]}\]


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

 

Miscible liquids having slightly different boiling points can be separated by the

  1. evaporation
  2. distillation
  3. fractional distillation
  4. sedimentation

Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.


Give an example of a reaction where the following are involved:

Close contact


What do you observe? When

Water is added to the quick lime.


State the original colour of the following substance and colour of residue obtained after heating.

Zinc carbonate


Give a chemical test to distinguish between the following gases. 

NH3 and HCl


Distinguish by heating the following in dry test tubs.

Ammonium Chloride and iodine.


Select the correct answer for the following options:

The black residue obtained on heating copper carbonate.


Select the correct answer for the following options:

The gas obtained when potassium chlorate is heated in the presence of a catalyst.


Give a word equation for the following reaction.

A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.


Match the chemical reactions in List I with the appropriate answer in List II.

  List I   List II
1. \[\ce{XY⇌[heat]X + Y}\] A: Displacement reaction
2. \[\ce{XY->X + Y}\] B: Double decomposition
3. \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] C: Endothermic reaction
4. \[\ce{X + YZ->XZ + Y}\] D: Thermal dissociation
5. \[\ce{X + Y->[heat]XY -\Delta}\] E: Decomposition reaction

Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].


Assertion: The formation of iron oxide from iron is a chemical change.

Reason: For the rust to form from iron, it must be exposed to air and water.


What is the use of indicator?


Which of the following is/are true when milk changes into curd?

  1. Its state is changed from liquid to semi solid.
  2. It changes colour.
  3. It changes taste.
  4. The change cannot be reversed.

Choose the correct option from below:


Which of the following statement is incorrect for a chemical reaction?


Match the following:

  Column I   Column II
1. Burning of coal a. Rusting
2. Painting of a surface b. Evaporation
3. Dipping iron in the water c. Chemical change
4. Salt from seawater d. Prevention of rusting

Give an example where heat, light, and sound are produced during a chemical change.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×