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प्रश्न
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
उत्तर
Limestone is predominantly Calcium carbonate(CaCO3). When calcium carbonate reacts with a 10% solution of HCl. Then Calcium chloride is formed as a salt along with water and carbon dioxide gas (brisk effervescence).
2HCl + CaCO3 → CaCl2 + CO2 +H2O
In this reaction, we add hydrogen ions (H+), which will react with the carbonate ion [\ce{(CO^{2-}_3)}\] to form hydrogen carbonate \[\ce{(HCO^-_3)}\] ions, which are soluble in water and the limestone will dissolve.
संबंधित प्रश्न
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Fill in the blank
A new substance is formed in a _______ change.
Explain the following reaction with one suitable example of Decomposition reaction
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)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
Name: Gas with rotten egg smell.
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
A chemical change may involve –
Which of the following is/are true when milk changes into curd?
- Its state is changed from liquid to semi-solid.
- It changes colour.
- It changes the taste.
- The change cannot be reversed.
Choose the correct option from below:
Beating an egg to make a cake is a ______.
