A metal M reacts with sodium hydroxide to give a white precipitate X which is soluble in excess of NaOH to give Y. Compound X is soluble in HCl to form a compound Z. Identify M, X, Y and Z. M X Y Z (a) Si SiO2 Na2 SiO3 SiCl4 (b) Al Al(OH)3 NaAlO2 AlCl3 (c) Mg Mg(OH)3 NaMgO3 MgCl2 (d) Ca Ca(OH)2 Na2CO3 NaHCO3

Question

A metal M reacts with sodium hydroxide to give a white precipitate X which is soluble in excess of NaOH to give Y. Compound X is soluble in HCl to form a compound Z. Identify M, X, Y and Z. M X Y Z (a) Si SiO2 Na2 SiO3 SiCl4 (b) Al Al(OH)3 NaAlO2 AlCl3 (c) Mg Mg(OH)3 NaMgO3 MgCl2 (d) Ca Ca(OH)2 Na2CO3 NaHCO3  (A) a (B) b (C) c (D) d

Tardigrade Admin · Accepted Answer

underset(M)2 Al +2 NaOH +6 H 2 O longrightarrow underset(X)2 Al ( OH )3+ xrightarrow[NaOH] text Exess of underset( Y ) NaAlO 2 underset(X)2 Al ( OH )3+6 HCl longrightarrow underset text (Z) 2 AlCl 3+6 H 2 O

	M	X	Y	Z
(a)	$S i$	$S i O_{2}$	$N a_{2} S i O_{3}$	$S i C l_{4}$
(b)	$A l$	$A l (O H)_{3}$	$N a A l O_{2}$	$A lC l_{3}$
(c)	$M g$	$M g (O H)_{3}$	$N a M g O_{3}$	$M g C l_{2}$
(d)	$C a$	$C a (O H)_{2}$	$N a_{2} C O_{3}$	$N a H C O_{3}$

a

b

c

d

(M)2Al​+2NaOH+6H2​O⟶(X)2Al(OH)3​​+ Exess of NaOH​(Y)NaAlO2​​ (X)2Al(OH)3​​+6HCl⟶ (Z) 2AlCl3​​+6H2​O

$(M) 2 A l + 2 N a O H + 6 H_{2} O ⟶ (X) 2 A l (O H)_{3} + Exess of N a O H (Y) N a A l O_{2}$
$(X) 2 A l (O H)_{3} + 6 H Cl ⟶ (Z) 2 A lC l_{3} + 6 H_{2} O$