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CHXI10:THE S-BLOCK ELEMENTS

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

1

2 {CaSO}_{4} \cdot 3 H_{2} O

2

{CaSO}_{4} \cdot H_{2} O

3

2 {CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4}

CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1

{CaSO}_{4}

2

{CaSO}_{4} \cdot \frac{1}{2} H_{2} O

3

{CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4} \cdot 2 H_{2} O

NCERT Exempler

CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric

O_{2}

2 Combining with atomospheric

{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

KCl

2

{NH}_{4} Cl

3

{Ca}_{3} {({PO}_{4})}_{2}

4

{NaHCO}_{3}

CHXI10:THE S-BLOCK ELEMENTS

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

1

2 {CaSO}_{4} \cdot 3 H_{2} O

2

{CaSO}_{4} \cdot H_{2} O

3

2 {CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4}

CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1

{CaSO}_{4}

2

{CaSO}_{4} \cdot \frac{1}{2} H_{2} O

3

{CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4} \cdot 2 H_{2} O

NCERT Exempler

CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric

O_{2}

2 Combining with atomospheric

{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

KCl

2

{NH}_{4} Cl

3

{Ca}_{3} {({PO}_{4})}_{2}

4

{NaHCO}_{3}

CHXI10:THE S-BLOCK ELEMENTS

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

1

2 {CaSO}_{4} \cdot 3 H_{2} O

2

{CaSO}_{4} \cdot H_{2} O

3

2 {CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4}

CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1

{CaSO}_{4}

2

{CaSO}_{4} \cdot \frac{1}{2} H_{2} O

3

{CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4} \cdot 2 H_{2} O

NCERT Exempler

CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric

O_{2}

2 Combining with atomospheric

{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

KCl

2

{NH}_{4} Cl

3

{Ca}_{3} {({PO}_{4})}_{2}

4

{NaHCO}_{3}

CHXI10:THE S-BLOCK ELEMENTS

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

1

2 {CaSO}_{4} \cdot 3 H_{2} O

2

{CaSO}_{4} \cdot H_{2} O

3

2 {CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4}

CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1

{CaSO}_{4}

2

{CaSO}_{4} \cdot \frac{1}{2} H_{2} O

3

{CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4} \cdot 2 H_{2} O

NCERT Exempler

CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric

O_{2}

2 Combining with atomospheric

{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

KCl

2

{NH}_{4} Cl

3

{Ca}_{3} {({PO}_{4})}_{2}

4

{NaHCO}_{3}

CHXI10:THE S-BLOCK ELEMENTS

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

1

2 {CaSO}_{4} \cdot 3 H_{2} O

2

{CaSO}_{4} \cdot H_{2} O

3

2 {CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4}

CHXI10:THE S-BLOCK ELEMENTS

315967 Dead burnt plaster is

1

{CaSO}_{4}

2

{CaSO}_{4} \cdot \frac{1}{2} H_{2} O

3

{CaSO}_{4} \cdot H_{2} O

4

{CaSO}_{4} \cdot 2 H_{2} O

NCERT Exempler

CHXI10:THE S-BLOCK ELEMENTS

315968 Setting of plaster of paris involves

1 Oxidation with atmospheric

O_{2}

2 Combining with atomospheric

{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

KCl

2

{NH}_{4} Cl

3

{Ca}_{3} {({PO}_{4})}_{2}

4

{NaHCO}_{3}

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