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प्रश्न
Which of the following is not an “element + element → compound” type reaction?
पर्याय
C(s) + O2(g) → CO2(g)
2K(s) + Br2(l) → 2KBr(s)
2CO(g) + O2(g) → 2CO2(g)
4Fe(s) + 3O2(g) → 2Fe2O3(s)
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उत्तर
2CO(g) + O2(g) → 2CO2(g)
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संबंधित प्रश्न
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
Complete the statement by filling the gap using an 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)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
Give an example of a reaction where the following are involved
Heat
Give an example of a reaction where the following are involved:
Close contact
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give an example of the following chemical changes.
A reaction where colour change is noticed.
What do you observe when CO2 is passed through lime water first and then a little in excess.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
