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

315961 Compound A reacts with \(\mathrm{NH}_{4} \mathrm{Cl}\) and forms a compound B . Compound B reacts \(\mathrm{H}_{2} \mathrm{O}\) with and excess of \(\mathrm{CO}_{2}\) to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A, B and C, are respectively.

1 \(\mathrm{CaCl}_{2}, \mathrm{NH}_{4}^{+},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\)
2 \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{4}^{+},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\)
3 \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}\)
4 \(\mathrm{CaCl}_{2}, \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}\)
CHXI10:THE S-BLOCK ELEMENTS

315962 On passing excess of \(\mathrm{CO}_{2}\) in lime water, its milky appearance disappears because

1 Soluble \(\mathrm{Ca}(\mathrm{OH})_{2}\) is formed
2 Soluble \(\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}\) is formed
3 Reaction becomes reversible
4 Calcium compound evaporated
CHXI10:THE S-BLOCK ELEMENTS

315963 The commercial name for calcium oxide is :

1 Quick lime
2 Milk of lime
3 Slaked lime
4 Limestone
CHXI10:THE S-BLOCK ELEMENTS

315964 The difference of water molecules in gypsum and plaster of paris is

1 \(2 \dfrac{1}{2}\)
2 \({\rm{2}}\)
3 \(1 \dfrac{1}{2}\)
4 \(1 / 2\)
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CHXI10:THE S-BLOCK ELEMENTS

315961 Compound A reacts with \(\mathrm{NH}_{4} \mathrm{Cl}\) and forms a compound B . Compound B reacts \(\mathrm{H}_{2} \mathrm{O}\) with and excess of \(\mathrm{CO}_{2}\) to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A, B and C, are respectively.

1 \(\mathrm{CaCl}_{2}, \mathrm{NH}_{4}^{+},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\)
2 \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{4}^{+},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\)
3 \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}\)
4 \(\mathrm{CaCl}_{2}, \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}\)
CHXI10:THE S-BLOCK ELEMENTS

315962 On passing excess of \(\mathrm{CO}_{2}\) in lime water, its milky appearance disappears because

1 Soluble \(\mathrm{Ca}(\mathrm{OH})_{2}\) is formed
2 Soluble \(\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}\) is formed
3 Reaction becomes reversible
4 Calcium compound evaporated
CHXI10:THE S-BLOCK ELEMENTS

315963 The commercial name for calcium oxide is :

1 Quick lime
2 Milk of lime
3 Slaked lime
4 Limestone
CHXI10:THE S-BLOCK ELEMENTS

315964 The difference of water molecules in gypsum and plaster of paris is

1 \(2 \dfrac{1}{2}\)
2 \({\rm{2}}\)
3 \(1 \dfrac{1}{2}\)
4 \(1 / 2\)
CHXI10:THE S-BLOCK ELEMENTS

315961 Compound A reacts with \(\mathrm{NH}_{4} \mathrm{Cl}\) and forms a compound B . Compound B reacts \(\mathrm{H}_{2} \mathrm{O}\) with and excess of \(\mathrm{CO}_{2}\) to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A, B and C, are respectively.

1 \(\mathrm{CaCl}_{2}, \mathrm{NH}_{4}^{+},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\)
2 \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{4}^{+},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\)
3 \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}\)
4 \(\mathrm{CaCl}_{2}, \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}\)
CHXI10:THE S-BLOCK ELEMENTS

315962 On passing excess of \(\mathrm{CO}_{2}\) in lime water, its milky appearance disappears because

1 Soluble \(\mathrm{Ca}(\mathrm{OH})_{2}\) is formed
2 Soluble \(\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}\) is formed
3 Reaction becomes reversible
4 Calcium compound evaporated
CHXI10:THE S-BLOCK ELEMENTS

315963 The commercial name for calcium oxide is :

1 Quick lime
2 Milk of lime
3 Slaked lime
4 Limestone
CHXI10:THE S-BLOCK ELEMENTS

315964 The difference of water molecules in gypsum and plaster of paris is

1 \(2 \dfrac{1}{2}\)
2 \({\rm{2}}\)
3 \(1 \dfrac{1}{2}\)
4 \(1 / 2\)
CHXI10:THE S-BLOCK ELEMENTS

315961 Compound A reacts with \(\mathrm{NH}_{4} \mathrm{Cl}\) and forms a compound B . Compound B reacts \(\mathrm{H}_{2} \mathrm{O}\) with and excess of \(\mathrm{CO}_{2}\) to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A, B and C, are respectively.

1 \(\mathrm{CaCl}_{2}, \mathrm{NH}_{4}^{+},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\)
2 \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{4}^{+},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\)
3 \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}\)
4 \(\mathrm{CaCl}_{2}, \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}\)
CHXI10:THE S-BLOCK ELEMENTS

315962 On passing excess of \(\mathrm{CO}_{2}\) in lime water, its milky appearance disappears because

1 Soluble \(\mathrm{Ca}(\mathrm{OH})_{2}\) is formed
2 Soluble \(\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}\) is formed
3 Reaction becomes reversible
4 Calcium compound evaporated
CHXI10:THE S-BLOCK ELEMENTS

315963 The commercial name for calcium oxide is :

1 Quick lime
2 Milk of lime
3 Slaked lime
4 Limestone
CHXI10:THE S-BLOCK ELEMENTS

315964 The difference of water molecules in gypsum and plaster of paris is

1 \(2 \dfrac{1}{2}\)
2 \({\rm{2}}\)
3 \(1 \dfrac{1}{2}\)
4 \(1 / 2\)