The s-Block Elements

Class 11th Chemistry – 10 The s-Block Elements MCQs

Magnesium burns in CO2 to form

Correct! Wrong!

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Mg burns in Co2 to give MgO and C.

The compound of ____ is used for the production of acetylene.

Correct! Wrong!

Calcium carbide is used for the production of acetylene. CaC2 + 2 H2O ----------Ca(OH)2 + HC≡CH

Which of the following does not illustrate the anomalous behaviour of lithium?

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'Lithium is the hardest alkali metal' does not illustrate the anomalous behaviour of the lithium. Lithium is the hardest among alkali metals, as it has the strongest metallic bond.

Lithium is strongest reducing agent among alkali metals due to which of the following factor?

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Li due to highest hydration energy among the alkali metals is the strongest reducing agent.

The gas evolved on heating Na2CO3 is

Correct! Wrong!

Na2CO3 does not decompose on heating even to redness.

The solubility of calcium acetate in water ____ with rise in temperature.

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The solubility of calcium acetate in water decreases with rise in temperature. The dissolution of calcium water is of exothermic in nature. Therefore, the solubility of calcium acetate in water decreases with rise in temperature.

____ is sparingly soluble in water.

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CaSO4 is sparingly soluble in water. The sulphates of alkaline earth metals are less soluble in water. Their solubilities decrease on moving down the group from Be to Ba.

A mild base which is used as antacid is ____ .

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A mild base which is used as antacid is magnesium hydroxide.

Which of the following properties is not true for an alkali metal?

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In any period, alkali metal (except noble gas) has the lowest density. Therefore, alkali metals have large atomic volumes.

____ is used in the making of high strength springs.

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Copper-beryllium alloy is used in the making of high strength springs.

Plaster of Paris is used

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Plaster of Paris is used as a setting material for fractured bones and also in dentary.

Washing soda has formula

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Washing soda is Na2CO3.10 H2O.

Which of the statement is incorrect in context of alkali metals?

Correct! Wrong!

Alkali metals exhibit only +1 oxidation state as they have only 1 electron in their valence shell

Baking powder has one of the following constituents

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Baking powder contains NaHCO3, potassium hydrogen tartrate and starch.

Which statement is false for alkali metals?

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Na is basic in nature.

The formula of nitre is

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Nitre or Indian salt petre is KNO3.

The common Alum is

Correct! Wrong!

The common Alum is K2SO4.Al2(SO4)3.24H2O.

Of the metals Be, Mg, Ca and Sr of group IIA. In the periodic table the least ionic chloride would be formed by

Correct! Wrong!

Because of small atomic size and high I.E. Be forms covalent chloride.

Anhydrous calcium chloride is used as a ____ agent.

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Anhydrous calcium chloride is used as a dehydrating agent. Anhydrous halides of alkaline earth metals are hygroscopic and form hydrates. The tendency to form halide hydrates decreases down the group, due to which anhydrous calcium chloride is used as a dehydrating agent.

____ does not impart colour to flame.

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Magnesium does not impart colour to flame. This is because it has very high ionization enthalpy. Large amount of energy is required to excite their electrons. This energy is not available from the flame and hence, the electrons are not excited.

The formula of calcium cyanamide is

Correct! Wrong!

Calcium Cyanamide is CaNCN or CaCN2.

Setting of Plaster of Paris involves ____ .

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Setting of Plaster of Paris involves hydration. Setting of Paris involves hydration to yield another hydrate. CaSO4.0.5 H2O + 1.5 H2O ------ CaSO4.2 H2O

The substance not likely to contain CaCO3 is

Correct! Wrong!

Gypsum is CaSO4.2H2O

Which alkali metal cation has the highest polarising power?

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A cation is highly polarising if its charge/size ratio is very high. All cations have +1 charge but Li+ cation has the smallest size, thus it has the largest polarising power.

Which of these elements exhibits the maximum Photoelectric effect?

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Cs is the most electropositive, due to its lowest ionisation energy. Hence, it exhibits the maximum photoelectric effect.

____ and ____ are also essential for the transmission of impulses along nerve fibres.

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Calcium and magnesium ions are also essential for the transmission of impulses along nerve fibres.

Fly ash consists of ____.

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Fly ash consists of CaSiO3. To meet the increasing demand of cement, efforts have been made to find some substitute for cement. One of this is fly ash, which is a waste product from steel industry and mainly consists of calcium silicate CaSiO3.

____ maintain/s the concentration of calcium ions in the blood plasma.

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Calcitonin and parathyroid hormone maintain the concentration of calcium ions in the blood plasma. The concentration of calcium ions in blood plasma is about 100 mg L-1. This concentration is maintained by two hormones, calcitonin and parathyroid.

When sodium chloride is dissolved in water, the sodium ion is ____.

Correct! Wrong!

When sodium chloride is dissolved in water, the sodium ion is hydrated. Dissolution leads to hydration of the ions formed.

Which of the alkali metals exhibits radioactivity?

Correct! Wrong!

The last member of the alkali metal family exhibits radioactivity.

Class 11th Chemistry - 10 The s-Block Elements MCQs
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Class 11th Chemistry - 10 The s-Block Elements MCQs