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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Complete and balance the following chemical equations: N2 + O2 →

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प्रश्न

Complete and balance the following chemical equations:

N2 + O2  →

एका वाक्यात उत्तर
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उत्तर

N2 + O2  → 2NO(g)

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पाठ 6: Chemical Reactions - Exercise 1 [पृष्ठ ७३]

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सेलिना Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 1 | Q 6.1 | पृष्ठ ७३

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.


Give one example that illustrates the following characteristics of a chemical reaction:

Change in state


 What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.


FILL IN THE BLANK

........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.


TRUE \ FALSE

Copper can displace iron from iron sulphate.


TRUE \ FALSE

Positively charged electrode is called the anode. True or false ?


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

CaCO3 → CaO + CO2


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)

Electron ______ is complete in each hydrogen in a hydrogen molecule.


Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.

Hydrogen chloride


Give reason for the following:

A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.


Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.


State the following reaction represent oxidation or reduction.

\[\ce{Fe++->Fe+++}\]


Discuss how acid rain occurs due to emission of smoke from vehicles and industries?


Silver metal can displace hydrogen gas from nitric acid.


______ change results in the change of the substance.


Burning of paper is the best example of ______ change.


Water boiling into water vapour is an example of chemical change.


Classify each of the following, as a physical or a chemical change. Give reasons.

(a) Drying of a shirt in the sun.

(b) Rising of hot air over a radiator.

(c) Burning of kerosene in a lantern.

(d) Change the colour of black tea by adding lemon juice to it.

(e) Churning of milk cream to get butter.


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:


______ is the chemical name of slaked lime.


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