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प्रश्न
Fill in the blank:
The substances which undergo chemical change are called _______
उत्तर
The substances which undergo chemical change are called reactants .
APPEARS IN
संबंधित प्रश्न
The chemical name of baking soda is ______.
Changes in which new substances are formed are called ______ changes.
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
Differentiate between in Chemical reaction and chemical equation.
Explain the following reaction with one suitable example of Combination reactions .
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.
Give an example of a reaction where the following are involved
Catalyst
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Name: Two carbonates do not produce carbon dioxide on heating.
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Give a chemical test to distinguish between the following gases.
HCl and H2S
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
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].
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Burning of paper is a ______ change.
Which of the following is not an “element + element → compound” type reaction?
What is the use of indicator?
Which of the following is a chemical change?
State whether the following statements are true or false:
When a candle burns, both physical and chemical changes take place.
When magnesium is burnt in the air, a new substance is formed which is ______.
Galvanization is a process in which ______ is coated as a layer of iron.
Give an example where heat, light, and sound are produced during a chemical change.
Define the following term:
Chemical change
