The chemical formula of Plaster of Paris is:

1. CaSO4.12H2O

2. CaSO4.2H2O

3. CaSO4.H2O

4. 3CaSO4.H2O

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 89%
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The incorrect equation for Solvay process is -

1. Ca(OH)2+2NH4ClNH3+2H2O+CaCl2

2. 2NaHCO3Na2CO3+CO2+H2O

3. 2NaCl+CaCO3Na2CO3+CaCl2

4. None of the above.

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
From NCERT
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Potassium carbonate cannot be prepared by the Solvay process because -

1. Potassium carbonate is insoluble in water and does not precipitate out.
2. Potassium carbonate is soluble in water and does not precipitate out.
3. Potassium carbonate is soluble in water and does precipitate out.
4. Potassium carbonate is insoluble in water and does precipitate out.

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 75%
From NCERT
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The incorrect reaction among the following is:

1. Na2O2(s) + 2H2O(l) → 2NaOH(aq) + H2O2(g)
2. 2KO2(s) + 2H2O(l) → 2KOH(aq) + H2O2(aq) + O2(g)
3. Na2O(s) + CO2(g) → NaHCO3 (s) + H2O2(aq)
4. Na2O(s) + CO2(g) → Na2CO3 (s)

Subtopic:  Chemical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
 69%
From NCERT
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Quick lime is heated with silica to give:

1. CaSiO3

2. CaSiO4

3. CaSiO

4. Ca(SiO)3

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 66%
From NCERT
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The correct statement(s) among the following options is/are:

1. Sodium metal reacts violently with water.
2. Sodium metal is heated in a free supply of air to give sodium peroxide.
3. Sodium peroxide is dissolved in water to give sodium hydroxide.
4. All of the above.

Subtopic:  Chemical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
 91%
From NCERT
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