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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Give a Word Equation for the Following Reaction. Two Solids Which Combine on Heating, to Give a Liquid. - Chemistry

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प्रश्न

Give a word equation for the following reaction.

Two solids which combine on heating, to give a liquid.

एक पंक्ति में उत्तर

उत्तर

Carbon + Sulphur → Carbon disulphide

C + S → CS(l)

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अध्याय 5: Language of Chemistry - Objective Type Questions

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विराफ जे दलाल New Simplified Middle School Chemistry [English] Class 7
अध्याय 5 Language of Chemistry
Objective Type Questions | Q 2.1

संबंधित प्रश्न

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Formation of manure from leaves is a physical change.


How would you show that setting of curd is a chemical change?


Complete and balance the following chemical equations:

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


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

How is precipitate formation in a chemical reaction indicated?


Fill in the blank:

During a chemical reaction transfer of ________ takes place.


Fill in the blank:

In some chemical reactions an insoluble ________ is formed when two solutions are mixed.


Explain the following reaction with one suitable example of Double decomposition reaction.


Explain by writing a word equation.

Limestone powder disappears on adding to dilute hydrochloric acids.


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

Close contact


Give an example of a reaction where the following are involved

Catalyst


Complete and balance the following reaction:

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


Complete and balance the following reaction:

\[\ce{NH3 + O2 ->[\Delta]}\]


Name: Two nitrates that do not produce nitrogen dioxide on heating.


What do you observe when HCI is passed through a silver nitrate solution.


Distinguish by heating the following in dry test tubs.

Zinc carbonate, Copper carbonate and lead carbonate.


Distinguish by heating the following in dry test tubs.

Copper Sulphate and copper carbonate


Select the correct answer for the following options:

The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.


Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.


Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Zinc carbonate.


_____ is the basic material to manufacture urea.


Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.


Analogy:

H2O: Water:: NaCl: ______.


Arrange the following statements in correct sequence:

  1. One side is water-loving and other water-hating molecules.
  2. When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
  3. The dirt surrounded by the detergent molecules floats in the water making it dirty.
  4. Finally, the cloth is clean.
  5. The detergent molecules have two sides.
  6. Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.

Two chemical species X and Y combine together to form a product P which contains both X and Y

\[\ce{X + Y -> P}\]

X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?

(i) P is a compound

(ii) X and Y are compounds

(iii) X and Y are elements

(iv) P has a fixed composition


Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.


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


The chemical name of baking soda is sodium bicarbonate.


Photosynthesis is a chemical charge. Justify your answer.


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