Advertisements
Advertisements
प्रश्न
Which of the following statements is true about Ca(OH)2?
विकल्प
It is used in the preparation of bleaching powder.
It is a light blue solid.
It does not possess disinfectant property.
It is used in the manufacture of cement.
Advertisements
उत्तर
It is used in the preparation of bleaching powder.
Explanation:
Calcium hydroxide is used in the preparation of bleaching powder. It reacts with chlorine to form hypochlorite, a constituent of bleaching powder.
\[\ce{Ca(OH)2 + Cl2 -> CaCl2 + H2O + Ca(OCl)2}\]
It is a white amorphous powder and is sparingly soluble in water.
It possess disinfectant property and therefore, is used in white ash.
Cement is made from calcium oxide and the addition of other material such as clay, silica.
APPEARS IN
संबंधित प्रश्न
Describe two important uses of the following quicklime.
Describe the importance of the limestone.
Describe the importance of the cement.
Describe the importance of the plaster of paris.
Suspension of slaked lime in water is known as ______.
A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is ______.
Dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl26H2O, BaCl2.2H2O, SrCl2.2H2O, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?
When water is added to compound (A) of calcium, solution of compound (B) is formed. When carbon dioxide is passed into the solution, it turns milky due to the formation of compound (C). If excess of carbon dioxide is passed into the solution milkiness disappears due to the formation of compound (D). Identify the compounds A, B, C and D. Explain why the milkiness disappears in the last step.
A substance absorbs \[\ce{CO2}\] and violently reacts with water. That substance is ______.
Initial setting of cement is mainly due to ______.
What are the products formed in sequence when excess of CO2 is passed in slaked lime?
The conversion of hydroxyapatite occurs due to presence of p - ions in water. The correct formula of hydroxyapatite is ______.
\[\ce{Y <-[\Delta, 205°C] CaSO4.2H2O ->[\Delta, 120°C] X}\]
X and Y are respectively:
Which of the following on thermal decomposition yields a basic as well as acidic oxide?
The substance not likely to contain CaCO3 is ______.
