Identify the correct statement from the following. Be 2+ < Mg 2+ < Ca 2+ < Sr 2+ < Ba 2+

Lithium and Magnesium show some similarities in their physical properties as they are diagonally placed in the periodic tables.

The order of hydration enthalpies of alkaline earth cations

Lithium is softer among all alkali metals.

Lithium chloride is deliquescent and crystallizes as a hydrate, LiCl·6H 2 O.

What is the role of gypsum, CaSO 4 .2H 2 O in setting of cement? Identify the correct option from the following:

To slow down the setting process

To provide water molecules for hydration process

To help to remove water molecules

Chemistry - Sblock Elements - Quiz-9

(a) Limestone- used in the preparation of lime and cement.

(b) Cement- used in plastering and in construction of bridges.

The one which is correctly matched with its uses is-

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a,b
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b,c
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c
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a,b,c

Identify the correct statement from the following.

Be²⁺ < Mg²⁺ < Ca²⁺ < Sr²⁺ < Ba²⁺

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The order of hydration enthalpies of alkaline earth cations
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Lithium and Magnesium show some similarities in their physical properties as they are diagonally placed in the periodic tables.
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Lithium is softer among all alkali metals.
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Lithium chloride is deliquescent and crystallizes as a hydrate, LiCl·6H₂O.

What is the role of gypsum, CaSO₄.2H₂O in setting of cement? Identify the correct option from the following:

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To fasten the setting process
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To provide water molecules for hydration process
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To help to remove water molecules
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To slow down the setting process

The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO₂ is bubbled through an aqueous solution of B, C is a solid. Solid C on gentle heating gives back A. The compound A is -

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Na₂CO₃
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K₂CO₃
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CaSO₄.2H₂O
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CaCO₃

In replacement reaction

The reaction will be most favorable if M happens to be -

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K
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Rb
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Li
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Na

Match List I with List II for the compositions of substances and select the correct answer using the code given below the lists-

List-I Substances	List-II Composition
(A) Plaster of paris	(i) CaSO₄. 2HO
(B) Epsomite	(ii) CaSO₄.½H₂O
(C) Kieserite	(iii) MgSO₄.7H₂O
(D) Gypsum	(iv) MgSO₄.H₂O
	(v) CaSO₄

Code :

(A) (B) (C) (D)

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(iv) (iii) (ii) (i)
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(iii) (iv) (i) (ii)
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(ii) (iii) (iv) (i)
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(i) (ii) (iii) (v)

When A + Water → C + B, B is reacted with D, gas C again obtained. 'D' gives 'C' with $H_{2} S O_{4}$ . B gives yellow colour with bunsen flame. C is a flamable gas then what would be A, B, C and D :

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K, $H_{2}$ , NaOH, Zn
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Na, NaOH, $H_{2}$ , Zn
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Li, $H_{2}$ , LiOH, Zn
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None of the above

A solid compound 'X' on heating gives CO₂ gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of CO₂ through 'Y' in water, a clear solution, 'Z' is obtained. On boiling 'Z', compound 'X' is reformed. The compound 'X' is :-

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${CaCO}_{3}$
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${Na}_{2} {CO}_{3}$
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$K_{2} {CO}_{3}$
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$Ca {({HCO}_{3})}_{2}$

The most convenient method to protect the bottom of ship made of iron is : -

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Coating it with Red lead oxide.
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White tin plating.
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Connecting it with Mg block.
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Connecting it with Pb block.

Alkali metals are not found in nature in their elemental state because they are :

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Less reactive due to low ionization energies.
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Highly reactive due to low ionization energies.
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Highly reactive due to low electron gain enthalpy.
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Less reactive due to low electron gain enthalpy.

The oxidation state of sodium in Na₂O₂ is -

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+1
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-1
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0
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+2

Alkali and alkaline earth metals cannot be obtained by chemical reduction method because they are the strongest :

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Oxidizing agents.
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Reducing agents.
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Hydrating agents.
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Drying agents.

Beryllium and Magnesium do not impart color in flame test, because -

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Be and Mg have high Ionization Energy.
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Be and Mg have low Ionization Energy.
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Be and Mg radiate energy in the Infra-Red region.
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Be and Mg have a high radius.

The incorrect equation for Solvay process is -

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$Ca {(OH)}_{2} + 2 {NH}_{4} Cl \to {NH}_{3} + 2 H_{2} O + {CaCl}_{2}$
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$2 {NaHCO}_{3} \to {Na}_{2} {CO}_{3} + {CO}_{2} + H_{2} O$
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$2 NaCl + {CaCO}_{3} \to {Na}_{2} {CO}_{3} + {CaCl}_{2}$
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None of the above.

Potassium carbonate cannot be prepared by the Solvay process because -

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Potassium carbonate is insoluble in water and does not precipitate out.
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Potassium carbonate is soluble in water and does not precipitate out.
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Potassium carbonate is soluble in water and does precipitate out.
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Potassium carbonate is insoluble in water and does precipitate out.

The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water because -

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Lattice energies of carbonates and hydroxides formed by calcium and magnesium are much more than those of sodium and potassium.
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Lattice energies of carbonates and hydroxides formed by sodium and potassium are much more than those of calcium and magnesium.
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Enthalpy of carbonates and hydroxides formed by calcium and magnesium are much more than those of sodium and potassium.
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Enthalpy of carbonates and hydroxides formed by sodium and potassium are much more than those of calcium and magnesium.

Lithium salts are generally hydrated because they have :

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High polarizing power.
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High ionization enthalpy.
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High electronegativity.
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Low polarizing power.

LiF is almost insoluble in water whereas LiCl is soluble in water and acetone both, because of:

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Greater covalent character of LiCl as compared to LiF.
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Greater hydration energy of LiF as compared to LiCl.
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Greater size of LiF as compared to LiCl.
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Greater lattice energy of LiF as compared to LiCl.

The incorrect reaction among the following is:

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Na₂O₂(s) + 2H₂O(l) → 2NaOH(aq) + H₂O₂(g)
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2KO₂(s) + 2H₂O(l) → 2KOH(aq) + H₂O₂(aq) + O₂(g)
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Na₂O(s) + CO₂(g) → NaHCO₃ (s) + H₂O₂(aq)
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Na₂O(s) + CO₂(g) → Na₂CO₃ (s)

The incorrect statement among the following regarding alkaline earth metals is :

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Alkaline earth metals are silvery-white, lustrous, and harder than alkali metals.
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Only Ca, Sr, Mg, and Ba give a flame test.
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Alkaline earth metals have high electrical, and thermal conductivities.
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All alkaline earth metals react with halogen and form metal halides, with the general formula ${MX}_{2}$ .

The incorrect statement among the following is-

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Ionisation enthalpy of alkaline earth metals is higher than alkali metals.
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Alkaline earth metal oxides are more basic than alkali metal oxides.
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Alkaline earth metal hydroxides are less basic and less stable than alkali metal hydroxides.
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Solubility of Alkaline earth metals and alkali metal hydroxide increases down the group.

Why can alkali and alkaline earth metals not be obtained by chemical reduction methods?

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They are a strong reducing agent
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They are a strong oxidizing agent
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Their compounds are nonreactive in nature.
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None of these

Quick lime is heated with silica to give:

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CaSiO₃
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CaSiO₄
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CaSiO
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Ca(SiO)₃

The correct statement(s) among the following options is/are:

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BeO is almost insoluble but BeSO₄ is soluble in water.
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BaO is soluble but BaSO₄ is insoluble in water.
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LiI is more soluble than KI in ethanol.
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All of the above.

Match the following:

Element Biological Significance

a) Sodium (i) oxidation of glucose to produce ATP.

b) Potassium (ii) Helps in transporting sugars and amino acids into the cells.

c) Magnesium (iii) Helps in the coagulation of blood.

d) Calcium (iv) Helps in building and strengthening bones.

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(a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)
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(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
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(a) - (iv), (b) - (ii), (c) - (i), (d) - (iii)
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(a)- (iii), (b) - (i), (c) - (iv), (d) - (iii)

Sodium hydroxide can be prepared by:

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Down's Process.
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Castner–Kellner process.
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Solvay's Process.
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None of the above.

The correct order of hydration enthalpies of alkali metal ions is -

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$L i^{+} > N a^{+} > K^{+} > R b^{+} > C s^{+}$
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$N a^{+} > L i^{+} > K^{+} > R b^{+} > C s^{+}$
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$L i^{+} > N a^{+} > K^{+} > C s^{+} > R b^{+}$
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$N a^{+} > L i^{+} > K^{+} > C s^{+} > R b^{+}$

Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is:

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Calcium chloride
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Magnesium chloride
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Beryllium chloride
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Strontium chloride

The structures of beryllium chloride in solid-state, and vapour state are :

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Dimer, and Linear, respectively.
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Chain in both.
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Chain, and dimer, respectively.
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Linear in both.

Among the following, the metal that can be used as electrode in the photoelectric cell is-

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Li
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Na
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Rb
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Cs

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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