Chemical Reactions and Equations
7 Board Chemistry previous year questions on Chemical Reactions and Equations — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.
What is the chemical name of slaked lime ?
Calcium Hydroxide
The chemical name of slaked lime is calcium hydroxide (Ca(OH)₂).
Explanation:
-
When quick lime (CaO) is mixed with water, it reacts as:
\([CaO+{H}_{2}O\to Ca(OH{)}_{2}]\) -
The product Ca(OH)₂ is called slaked lime.
| Chemical Name | Formula | Common Name |
| Calcium Oxychloride | \({\mathrm{CaOCl}}_{2}\) | Bleaching Powder |
| Calcium Chloride | \({\mathrm{CaCl}}_{2}\) | Drying Agent |
| Calcium Oxide | CaO | Quicklime |
| Calcium Hydroxide | \(\mathrm{Ca}{(\mathrm{OH})}_{2}\) | Slaked lime |
Which of the following reactions is an example of decomposition reaction?
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Reaction : \(2{\mathrm{PbO}}_{(\mathrm{s})}+{\mathrm{C}}_{(\mathrm{s})}\to 2{\mathrm{Pb}}_{(\mathrm{s})}+{\mathrm{CO}}_{2(\mathrm{g})}\)
Statements: i) Lead is getting oxidised.
ii) Carbon dioxide is getting oxidised.
iii) Carbon is getting oxidised.
iv) Lead oxide is getting reduced.
True statement for above reaction is -
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Reaction: \(2{\mathrm{PbO}}_{(\mathrm{s})}+{\mathrm{C}}_{(\mathrm{s})}\to 2{\mathrm{Pb}}_{(\mathrm{s})}+{\mathrm{CO}}_{2(\mathrm{g})}\)
Statements: i) Lead is getting oxidised.
ii) Carbon dioxide is getting oxidised.
iii) Carbon is getting oxidised.
iv) Lead oxide is getting reduced.
True statement for above reaction is -
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Number of electrons present in M shell of phosphorous atom is -
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\(\mathrm{Fe}+{\mathrm{H}}_{2}\mathrm{O}\to {\mathrm{Fe}}_{3}{\mathrm{O}}_{4}+{\mathrm{H}}_{2}\)
The coefficient of Fe in the balanced equation of the above reaction will be;
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SECTION - A
Multiple Choice Questions (Q. No. 1 - 6 ) : - Each Q. 1 Mark
\(\mathrm{KOH}+{\mathrm{H}}_{2}{\mathrm{SO}}_{4}\to {\mathrm{K}}_{2}{\mathrm{SO}}_{4}+{\mathrm{H}}_{2}\mathrm{O}\)
The above reaction is an example of a
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