Match the column I with column II and mark the appropriate choice. | | Column I | | Column II | | --- | --- | --- | --- | | (A) | $Na^+$ | (i) | Chlorophyll | | (B) | $K^+$ | (ii) | Bones and teeth | | (C) | $Ca^{2+}$ | (iii) | Regulating flow of water across cell membrane | | (D) | $Mg^{2+}$ | (iv) | Activation of enzyme in this cell fluids |

$(A)\rightarrow (iii), (B)\rightarrow (iv), (C)\rightarrow (ii), (D)\rightarrow (i)$

Uses of group 2 compounds - class-XII

Question 1 Multiple Choice (Single Answer)

Which salt can be used to identify coloured cation?

Borax
Microcosmic salt
Both (a) and (b)
None of these

Question 2 Multiple Choice (Single Answer)

Following compounds are used in fire-works :

$LiNO _{3}$
$BaCl _{2}$
$(NH _{4}) _{2}Cr _{2}O _{7}$
all of these

Question 3 Multiple Choice (Single Answer)

The hydration energy of ${Mg}^{+2}$ is larger than that of ?

${Al}^{+3}$
${Na}^{+1}$
${Be}^{+2}$
${Mg}^{+3}$

Question 4 Multiple Choice (Single Answer)

Metal used in flash photography is:

Mg
Al
Both Mg & Al
Neither Mg nor Al

Question 5 Multiple Choice (Single Answer)

The compound formed when an alkyl halide reacts with magnesium in ether is:

Grignard reagent
Antiseptic
Anaesthetic
Antipyretic

Question 6 Multiple Choice (Single Answer)

Which is used to treat acid indigestion?

$Be(OH) _2$
$KOH$
$Mg(OH) _2$
$Ca(OH) _2$

Question 7 Multiple Choice (Multiple Answers)

Which of the following metals on treatment with alkali will liberate $H _2$ gas?

Be
Sn
Ga
In

Question 8 Multiple Choice (Single Answer)

The substance used as pigment in paint is :

borax
alumina
lithophone
none of these

Question 9 Multiple Choice (Multiple Answers)

Mg and Zn have following resemblance :

MgO and ZnO are amphoteric.
$MgCO _3$ and $ZnCO _3$ both on heating give corresponding oxide.
both are d-block elements.
both are used to prevent corrosion.

Question 10 Multiple Choice (Multiple Answers)

Kieserite is not an ore of:

Cu
Fe
Mg
Al

Question 11 Multiple Choice (Single Answer)

Lithopone is mixture of :

$ZnCO _3, BaCO _3$
$ZnS, Na _2SO _4$
$ZnSO _4, BaSO _4$
$ZnS, BaSO _4$

Question 12 Multiple Choice (Single Answer)

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	$Na^+$	(i)	Chlorophyll
(B)	$K^+$	(ii)	Bones and teeth
(C)	$Ca^{2+}$	(iii)	Regulating flow of water across cell membrane
(D)	$Mg^{2+}$	(iv)	Activation of enzyme in this cell fluids

$(A)\rightarrow (i), (B)\rightarrow (iii), (C)\rightarrow (ii), (D)\rightarrow (iv)$
$(A)\rightarrow (iv), (B)\rightarrow (iii), (C)\rightarrow (ii), (D)\rightarrow (i)$
$(A)\rightarrow (i), (B)\rightarrow (ii), (C)\rightarrow (iii), (D)\rightarrow (iv)$
$(A)\rightarrow (iii), (B)\rightarrow (iv), (C)\rightarrow (ii), (D)\rightarrow (i)$

Question 13 Multiple Choice (Single Answer)

Nuclear attraction is often the deciding control factor for the association of natural molecules to
a given metal ion. Which one of the following represents the correct order of stability of the ions?
$[Be(H _2O) _4]^{2+} , [Mg(H _2O) _4]^{2+} , Ca(H _2O) _4]^{2+} and Sr(H _2O)^4]^{2+}$

$[Be(H _2O) _4]^{2+} > Sr(H _2O) _4]^{2+}] > [Mg(H _2O) _4]^{2+} > [Ca(H _2O)^4]^{2+}$
$[Ca(H _2O) _4]^{2+} > [Mg(H _2O) _4]^{2+} > [Be(H _2O) _4]^{2+} > Sr(H _2O) _4]^{2+}$
$[Sr(H _2O) _4]^{2+} > [Ca(H _2O) _4]^{2+} > [Mg(H _2O) _4]^{2+} > [Be(H _2O) _4]^{2+}$
$[Be(H _2O) _4]^{2+} > [Mg(H _2O) _4]^2 > [Ca(H _2O) _4]^{2+} > Sr(H _2O) _4]^{2+}$

Question 14 Multiple Choice (Single Answer)

Based on the following analytical data, answer the given question.
A mineral, which can be represented by the formula $Mg _xBa _y(CO _3) _2$, was analyzed as described below:

A sample of the mineral was dissolved in excess hydrochloric acid and the solution made up to $100 cm^3$ with water. During the process, $48 cm^3$ of carbon dioxide, measured at $25^{\circ}C$ and 1-atmosphere pressure, were evolved.

A $25.0 cm^3$ portion of the resulting solution required $25.0 cm^3$ of EDTA solution of concentration $0.02 \ mol / dm^3$ to reach an end-point. A further $25.0 cm^3$ portion gave a precipitate of barium sulphate of mass 0.058 g on treatment with excess dilute sulphuric acid. You may assume that group-2 metal ions form 1:1 complexes with EDTA. Molar volume of any gas at $25^{\circ}C$ and 1 atmosphere pressure $ = 24 dm^3$).

The formula of the mineral is:

$MgBa(CO _3) _4$
$MgBa(CO _3) _2$
$MgBa(CO _3) _3$
$Mg _2Ba(CO _3) _4$

Uses of group 2 compounds - class-XII

Questions