Some Important Compounds of Calcium
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CHXI10:THE S-BLOCK ELEMENTS

315966 Gypsum, \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) on heating to about \(120^{\circ} \mathrm{C}\) forms plaster of paris which has chemical composition represented by

1 \(2 \mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
3 \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4}\)
CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1 \(\mathrm{CaSO}_{4}\)
2 \(\mathrm{CaSO}_{4} \cdot \dfrac{1}{2} \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
NCERT Exempler
CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric \(\mathrm{O}_{2}\)
2 Combining with atomospheric \(\mathrm{CO}_{2}\)
3 Hydration
4 Dehydration
CHXI10:THE S-BLOCK ELEMENTS

315969 By adding gypsum to cement

1 setting time of cement becomes less.
2 setting time of cement increases.
3 colour of cement becomes light.
4 shining surface is obtained.
CHXI10:THE S-BLOCK ELEMENTS

316002 The salt added to table salt to make it flow freely in rainy season is:

1 \(\mathrm{KCl}\)
2 \(\mathrm{NH}_{4} \mathrm{Cl}\)
3 \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\)
4 \(\mathrm{NaHCO}_{3}\)
NEET DIGITAL LIBRARY
CHXI10:THE S-BLOCK ELEMENTS

315966 Gypsum, \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) on heating to about \(120^{\circ} \mathrm{C}\) forms plaster of paris which has chemical composition represented by

1 \(2 \mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
3 \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4}\)
CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1 \(\mathrm{CaSO}_{4}\)
2 \(\mathrm{CaSO}_{4} \cdot \dfrac{1}{2} \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
NCERT Exempler
CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric \(\mathrm{O}_{2}\)
2 Combining with atomospheric \(\mathrm{CO}_{2}\)
3 Hydration
4 Dehydration
CHXI10:THE S-BLOCK ELEMENTS

315969 By adding gypsum to cement

1 setting time of cement becomes less.
2 setting time of cement increases.
3 colour of cement becomes light.
4 shining surface is obtained.
CHXI10:THE S-BLOCK ELEMENTS

316002 The salt added to table salt to make it flow freely in rainy season is:

1 \(\mathrm{KCl}\)
2 \(\mathrm{NH}_{4} \mathrm{Cl}\)
3 \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\)
4 \(\mathrm{NaHCO}_{3}\)
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CHXI10:THE S-BLOCK ELEMENTS

315966 Gypsum, \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) on heating to about \(120^{\circ} \mathrm{C}\) forms plaster of paris which has chemical composition represented by

1 \(2 \mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
3 \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4}\)
CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1 \(\mathrm{CaSO}_{4}\)
2 \(\mathrm{CaSO}_{4} \cdot \dfrac{1}{2} \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
NCERT Exempler
CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric \(\mathrm{O}_{2}\)
2 Combining with atomospheric \(\mathrm{CO}_{2}\)
3 Hydration
4 Dehydration
CHXI10:THE S-BLOCK ELEMENTS

315969 By adding gypsum to cement

1 setting time of cement becomes less.
2 setting time of cement increases.
3 colour of cement becomes light.
4 shining surface is obtained.
CHXI10:THE S-BLOCK ELEMENTS

316002 The salt added to table salt to make it flow freely in rainy season is:

1 \(\mathrm{KCl}\)
2 \(\mathrm{NH}_{4} \mathrm{Cl}\)
3 \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\)
4 \(\mathrm{NaHCO}_{3}\)
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CHXI10:THE S-BLOCK ELEMENTS

315966 Gypsum, \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) on heating to about \(120^{\circ} \mathrm{C}\) forms plaster of paris which has chemical composition represented by

1 \(2 \mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
3 \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4}\)
CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1 \(\mathrm{CaSO}_{4}\)
2 \(\mathrm{CaSO}_{4} \cdot \dfrac{1}{2} \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
NCERT Exempler
CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric \(\mathrm{O}_{2}\)
2 Combining with atomospheric \(\mathrm{CO}_{2}\)
3 Hydration
4 Dehydration
CHXI10:THE S-BLOCK ELEMENTS

315969 By adding gypsum to cement

1 setting time of cement becomes less.
2 setting time of cement increases.
3 colour of cement becomes light.
4 shining surface is obtained.
CHXI10:THE S-BLOCK ELEMENTS

316002 The salt added to table salt to make it flow freely in rainy season is:

1 \(\mathrm{KCl}\)
2 \(\mathrm{NH}_{4} \mathrm{Cl}\)
3 \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\)
4 \(\mathrm{NaHCO}_{3}\)
NEET DIGITAL LIBRARY
CHXI10:THE S-BLOCK ELEMENTS

315966 Gypsum, \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) on heating to about \(120^{\circ} \mathrm{C}\) forms plaster of paris which has chemical composition represented by

1 \(2 \mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
3 \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4}\)
CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1 \(\mathrm{CaSO}_{4}\)
2 \(\mathrm{CaSO}_{4} \cdot \dfrac{1}{2} \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
NCERT Exempler
CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric \(\mathrm{O}_{2}\)
2 Combining with atomospheric \(\mathrm{CO}_{2}\)
3 Hydration
4 Dehydration
CHXI10:THE S-BLOCK ELEMENTS

315969 By adding gypsum to cement

1 setting time of cement becomes less.
2 setting time of cement increases.
3 colour of cement becomes light.
4 shining surface is obtained.
CHXI10:THE S-BLOCK ELEMENTS

316002 The salt added to table salt to make it flow freely in rainy season is:

1 \(\mathrm{KCl}\)
2 \(\mathrm{NH}_{4} \mathrm{Cl}\)
3 \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\)
4 \(\mathrm{NaHCO}_{3}\)