By the action of barium hydroxide on potassium sulphate

By the electrolysis of potassium chloride solution

By the action of lime on potassium chloride

By the action of lime on potassium carbonate.

–1 and –2 oxidation states.

Chemistry - Sblock Elements - Quiz-5

Sodium looses its lustre on exposure to air due to formation of-

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$N a_{2} O,$ NaOH and $N a_{2} C O_{3}$
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$N a_{2} O$ and NaOH
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$N a_{2} O$ and $N a_{2} C O_{3}$
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NaOH and $N a_{2} C O_{3}$

Sodium oxide reacts with water violently forming NaOH. On heating above 400ºC, it produces

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Monoxide and peroxide
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Monoxide and metallic sodium
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Peroxide and metallic sodium
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Monoxide and oxygen

Alkaline earth metals form hydrated crystalline solids such as $M g C l_{2} . 6 H_{2} O, C a C l_{2} . 6 H_{2} O$ . This is due to-

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Smaller ionic size
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Increased charge on ions
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Higher hydration enthalpies
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High oxidation potential

The commercial salt is purified by passing-

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$H_{2} S$ gas through an alkaline solution of salt
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HCl gas through a saturated solution of salt
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$H_{2}$ gas through a solution of salt
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$C l_{2}$ gas through a saturated solution of salt

Potassium is kept-

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Under cold water.
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In ammonia.
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In alcohol.
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In kerosene.

KOH can be prepared-

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By the electrolysis of potassium chloride solution
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By the action of barium hydroxide on potassium sulphate
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By the action of lime on potassium chloride
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By the action of lime on potassium carbonate.

Magnesium can be prepared by heating-

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$M g C l_{2}$ with CaO at 1775 K
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$M g C l_{2}$ with $C a C_{2}$ at 1775 K
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$M g C l_{2}$ with $C a {(O H)}_{2}$ under pressure
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MgO with $C a C_{2}$ at ordinary temperature

Nitrolim (a nitrogenous fertilizer) is a mixture of-

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Calcium carbide and calcium cyanamide.
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Calcium oxide and calcium carbide.
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Calcium cyanamide and carbon.
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Calcium oxide and carbon.

The strongest base among the following is-

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$Al {(OH)}_{3}$
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$Mg {(OH)}_{2}$
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$Ca {(OH)}_{2}$
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$Ba {(OH)}_{2}$

When magnesium ribbon is heated to redness in an atmosphere of nitrogen and subsequently cooled with water, the gas evolved is-

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$N_{2}$
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$N H_{3}$
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$H_{2}$
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$C O_{2}$

The ion of which of the following metals has least ionic conductivity in the aqueous solution-

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Lithium
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Sodium
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Potassium
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Rubidium

Magnesium hydride can be prepared by the action of-

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Lithium hydride on magnesium chloride
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Aluminium hydride on magnesium chloride
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Lithium aluminium hydride on magnesium chloride
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Lithium magnesium hydride on lithium chloride

Which of the following is not the characteristics of alkali metals –

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Low m.p.
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Low electronegativity
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High ionisation energies
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Their ions are isoelectronic with noble gases

Calcium can be obtained by the electrolysis of-

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$C a C l_{2}$ and $C a F_{2}$
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$C a {(O H)}_{2}$
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$C a C l_{2}$
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$C a F_{2}$

The incorrect statement regarding Be(II group) is -

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It forms an ionic carbide.
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Its carbonate decomposes on heating.
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Its halides are covalent.
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It is easily attacked by water.

The atomic volumes of alkali metals are in the order-

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Li > Na > K > Rb > Cs
(2) Li > Na = K > Rb > Cs
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2
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Li < Na < K < Rb < Cs
(4) Li < Na < K < Rb = Cs
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4

Lithium has the minimum tendency to form ${Li}^{+}$ ion. The aqueous solution of lithium is the

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Strongest reducing agent.
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Poorest reducing agent.
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Strongest oxidising agent.
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Poorest oxidising agent.

Alkali metals show-

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Only +1 oxidation state
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Only –1 oxidation state
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+1 and +2 oxidation states
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–1 and –2 oxidation states.

Considering greater polarisation in LiCl compared to that in NaCl, which of the following statement is wrong –

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The m.p of LiCl is lower than that of NaCl
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LiCl dissolves more in organic solvent than NaCl
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LiCl will ionise in water more than NaCl
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Fused LiCl would be less conducing than fused NaCl

When heated in steam, Mg burns brilliantly producing-

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$M g {(O H)}_{2}$
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$M g O a n d H_{2}$
0%

$M g O a n d O_{2}$
0%

$M g O a n d O_{3}$

A chloride dissolves appreciably in cold water. When placed in a platinum wire in Bunsen flame no distinctive colour is noticed. Which cation could be present –

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$B e^{2 +}$
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$B a^{2 +}$
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$P b^{2 +}$
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$C a^{2 +}$

The compounds of Ca are-

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Paramagnetic and colourless
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Paramagnetic and coloured
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Diamagnetic and coloured, provided their anions are also coloured
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Diamagnetic and colourless, provided their anions are also colourless

Calcium hydride can be obtained by heating :

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Calcium oxide with hydrogen.
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Calcium oxide with hydrogen under pressure.
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Calcium with hydrogen under pressure.
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Calcium with hydrogen at a very low temperature.

Mark the incorrect statement:

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Alkali metals are strong reducing agents.
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The electropositive nature of alkali metals decreases with increase in atomic number.
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Alkali metals have relatively low electronegativity values.
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On burning in oxygen lithium forms only the monoxide while other alkali metals form peroxides and or superoxides.

A hydrated water soluble salt, A in solution gives a turbidity with dilute hydrochloric acid evolving a gas with a suffocation odour. The solution of A decolourises lodine solution. A is likely to be

0%

KI
0%

$N a_{2} S O_{4} . 10 H_{2} O$
0%

$N a_{2} S_{2} O_{3} . 5 H_{2} O$
0%

$A g N O_{3}$

Which of the following compounds may be soluble in pyridine-

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Barium chloride
0%

Sodium chloride
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Lithium chloride
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Potassium chloride

Which of the following is a false statement-

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Sodium oxide is more basic then magnesium oxide.
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Beryllium oxide is amphoteric
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The thermal stability of beryllium carbonate is more than that of calcium carbonate
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Beryllium is amphoteric

The basic character of oxides MgO, SrO, $K_{2} O$ , NiO and $C s_{2} O$ increases in the order –

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$M g O > S r O > K_{2} O > N i O > C s_{2} O$
0%

$C s_{2} O > K_{2} O > M g O > S r O > N i O$
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$N i O < M g O < S r O < K_{2} O < C s_{2} O$
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$K_{2} O < N i O < M g O < S r O < C s_{2} O$

Which of the following ions is the best conductor of electricity in aqueous solution –

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$L i^{+}$
0%

$N a^{+}$
0%

$C s^{+}$
0%

$K^{+}$

Among the following, the incorrect statement is–

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Lithium is the softest among all the alkali metals
0%

Lithium possesses higher melting and boiling points
0%

It is least reactive among alkali metals
0%

It forms chloride which is soluble in alcohol

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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