Consider the following statements and identify the number of correct statements (I) Ca ( OH ) 2 is used in white wash (II) NaCl is used in preparation of washing soda (III) CaSO 4 ⋅ 2 1 H 2 O

Question

Consider the following statements and identify the number of correct statements

(I) $Ca (OH)_{2}$ is used in white wash

(II) NaCl is used in preparation of washing soda

(III) $CaSO_{4} \cdot \frac{1}{2} H_{2} O$ (Plaster of Paris) is used for making casts of statues

(IV) $CaCO_{3}$ is used as an antacid

(V) Except Be and Mg all s-block metals produces intense blue colour in liquied ammonia solution.

TestHub · Accepted Answer

(I) Ca(OH)₂ is used in whitewash.

(II) NaCl is used in the preparation of washing soda.

$2 N H_{3} + H_{2} O + C O_{2} \to (N H_{4})_{2} C O_{3}$

$(N H_{4})_{2} C O_{3} + H_{2} O + C O_{2} \to 2 N H_{4} H C O_{3}$

$N H_{4} H C O_{3} + N a Cl \to N H_{4} Cl + N a H C O_{3} (s)$

$2 N a H C O_{3} Δ N a_{2} C O_{3} + C O_{2} + H_{2} O$

(III) CaSO₄·½H₂O (Plaster of Paris) is used for making casts of statues.

(IV) CaCO₃ is used as an antacid.

(V) Except for Be and Mg, all s-block metals produce an intense blue color in liquid ammonia solution.

Final Answer: Option (D)

Chemistry - Complete s-block Question with Solution | TestHub