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प्रश्न
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.
उत्तर
The white particles of baking soda disappear when put in lemon juice. This means that it is a chemical change.
संबंधित प्रश्न
Define precipitation.
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
What do you observe when H2S is passed through a lead nitrate solution.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
______ is not a chemical change.
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
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 |
