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Explore popular questions from sBlock Element (Alkali and Alkaline earth metals) for NEET. This collection covers sBlock Element (Alkali and Alkaline earth metals) previous year NEET questions hand picked by experienced teachers.

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sBlock Element (Alkali and Alkaline earth metals)

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Q 1. Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

A

{tex} \mathrm { K } {/tex}

B

{tex} \mathrm { Rb } {/tex}

{tex}\mathrm {Li} {/tex}

D

{tex} \mathrm { Na } {/tex}

Explanation


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Q 2. Which of the following statements is false?

{tex} \mathrm { Ca } ^ { 2 + } {/tex} ions are not important in maintaining the regular beating of the heart.

B

{tex} \mathrm { Mg } ^ { 2 + } {/tex} ions are important in the green parts of the plants.

C

{tex} \mathrm { Mg } ^ { 2 + } {/tex} ions form a complex with ATP

D

{tex} \mathrm { Ca } ^ { 2 + } {/tex} ions are important in blood clotting

Explanation


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Q 3. The product obtained as a result of a reaction of nitrogen with {tex} \mathrm { CaC } _ { 2 } {/tex} is

A

{tex} \mathrm { CaCN } _ { 3 } {/tex}

B

{tex} \mathrm { Ca } _ { 2 } \mathrm { CN } {/tex}

{tex} \mathrm { Ca } \mathrm{C} \mathrm{ N _2 } {/tex}

D

{tex} \mathrm { CaCN } {/tex}

Explanation


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Q 4. On heating which of the following releases {tex} \mathrm { CO } _ { 2 } {/tex} most easily?

A

{tex} \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

{tex} \mathrm { MgCO } _ { 3 } {/tex}

C

{tex} \mathrm { CaCO } _ { 3 } {/tex}

D

{tex} \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

Explanation


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Q 5. {tex} \mathrm { 20.0g } {/tex} of a magnesium carbonate sample decomposes on heating to give carbon dioxide and {tex} \mathrm { 8.0g } {/tex} magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? {tex} \text { (At. wt. of } \mathrm { Mg } = 24 ) {/tex}

A

{tex} \mathrm { 96 } {/tex}

B

{tex} \mathrm { 60 } {/tex}

{tex} \mathrm {84 } {/tex}

D

{tex} \mathrm { 75 } {/tex}

Explanation


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Q 6. The function of the "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?

{tex} \mathrm { K^{+} } {/tex}

B

{tex} \mathrm { Fe } ^ { 2 + } {/tex}

C

{tex} \mathrm {Ca} ^ { 2 + } {/tex}

D

{tex} \mathrm { Mg } ^ { 2 + } {/tex}

Explanation

The Sodium pump is also known as a sodium-potassium pump. This pump is an important contributor to action potential produced by nerve cells. The process of moving sodium and potassium ions across the cell membrane is an active transport process involving the hydrolysis of ATP to provide the necessary energy. This process is responsible for maintaining the large excess of {tex} \mathrm {Na} ^ { + } {/tex} outside the cell and the large excess of {tex} \mathrm { K^{+} } {/tex} ions on the inside.

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Q 7. Solubility of the alkaline earth metal sulphates in water decreases in the sequence

A

{tex} \mathrm { Sr } > \mathrm { Ca } > \mathrm { Mg } > \mathrm { Ba } {/tex}

B

{tex} \mathrm { Ba } > \mathrm { Mg } > \mathrm { Sr } > \mathrm { Ca } {/tex}

{tex} \mathrm { Mg } > \mathrm { Ca } > \mathrm { Sr } > \mathrm { Ba } {/tex}

D

{tex} \mathrm { Ca } > \mathrm { Sr } > \mathrm { Ba } > \mathrm { Mg } {/tex}

Explanation


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Q 8. In Castner-Kellner cell for production of sodium hydroxide

A

brine is electrolyzed using graphite electrodes

B

molten sodium chloride is electrolysed

sodium amalgam is formed at mercury cathode

D

brine is electrolyzed with Pt electrodes

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Q 9. Which one of the alkali metals, forms only, the normal oxide, {tex} M _ { 2 } \mathrm { O } {/tex} on heating in air?

A

{tex} \mathrm { Rb } {/tex}

B

{tex} \mathrm {K } {/tex}

{tex} \mathrm { L } { \mathbf { i } } {/tex}

D

{tex} \mathrm { Na } {/tex}

Explanation


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Q 10. The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order:

A

{tex} \mathrm { Li } ^ { + } < \mathrm { K } ^ { + } < \mathrm { Na } ^ { + } < \mathrm { Rb } ^ { + } {/tex}

{tex} \mathrm { Rb } ^ { + } < \mathrm { K } ^ { + } < \mathrm { Na } ^ { + } < \mathrm { Li } ^ { + } {/tex}

C

{tex} \mathrm { K } ^ { + } < \mathrm { Na } ^ { + } < \mathrm { Rb } ^ { + } < \mathrm { Li } ^ { + } {/tex}

D

{tex} \mathrm { Na } ^ { + } < \mathrm { Li } ^ { + } < \mathrm { K } ^ { + } < \mathrm { Rb } ^ { + } {/tex}

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Q 11. Which of the following compounds has the lowest melting point?

A

{tex} \mathrm { CaCl } _ { 2 } {/tex}

B

{tex} \mathrm { CaBr } _ { 2 } {/tex}

{tex} \mathrm { CaI } _ { 2 } {/tex}

D

{tex} \mathrm { CaF } _ { 2 } {/tex}

Explanation


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Q 12. Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

A

{tex} \mathrm { CaOCl } _ { 2 } {/tex}

{tex} \mathrm { Ca } ( \mathrm { OCl } ) _ { 2 } {/tex}

C

{tex} \mathrm { CaO } _ { 2 } \mathrm { Cl } {/tex}

D

{tex} \mathrm { CaCl } _ { 2 } {/tex}

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Q 13. Match List-I with List-II for the compositions of substances and select the correct answer using the code given above.

A

{tex} ( \mathrm { A } ) - ( \mathrm { iii } ) , ( \mathrm { B } ) - ( \mathrm { iv } ) , ( \mathrm { C } ) - ( 1 ) , ( \mathrm { D } ) = ( \mathrm { ii } ) {/tex}

{tex} ( \mathrm { A } ) - ( \mathrm { ii } ) , ( \mathrm { B } ) - ( \mathrm { iii } ) ,{ C } ( \mathrm {iv} ) - , ( \mathrm { D } ) - ( \mathrm { i } ) {/tex}

C

{tex} ( \mathrm { A } ) - ( \mathrm { i } ) , ( \mathrm { B } ) - ( \mathrm { iii } ) ,{ C } ( \mathrm {iii} ) - , ( \mathrm { D } ) - ( \mathrm { iv } ) {/tex}

D

{tex} ( \mathrm { A } ) - ( \mathrm { iv } ) , ( \mathrm { B } ) - ( \mathrm { iii } ) ,{ C } ( \mathrm {ii} ) - , ( \mathrm { D } ) - ( \mathrm { i } ) {/tex}

Explanation


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Q 14. Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

A

{tex} \mathrm { CaSO } _ { 4 } {/tex}

{tex} \mathrm { BeSO } _ { 4 } {/tex}

C

{tex} \mathrm { BaSO } _ { 4 } {/tex}

D

{tex} \mathrm { SrSO } _ { 4 } {/tex}

Explanation


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Q 15. Property of the alkaline earth metals that increases with their atomic number

solubility of their hydroxides in water

B

solubility of their sulphates in water

C

ionization energy

D

electronegativity

Explanation


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Q 16. Which one of the following compounds is a peroxide?

A

{tex} \mathrm { KO } _ { 2 } {/tex}

{tex} \mathrm { BaO } _ { 2 } {/tex}

C

{tex} \mathrm { MnO } _ { 2 } {/tex}

D

{tex} \mathrm { NO } _ { 2 } {/tex}

Explanation


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Q 17. The compound {tex} A {/tex} on heating gives a colourless gas and a residue that is dissolved in water to obtain {tex} B {/tex} . Excess of {tex} \mathrm { CO } _ { 2 } {/tex} is bubbled through aqueous solution of {tex} B , C {/tex} is formed which is recovered in the solid form. Solid {tex} C {/tex} on gentle heating gives back {tex} A . {/tex} The compound is

{tex} \mathrm { CaCO } _ { 3 } {/tex}

B

{tex} \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

C

{tex} \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

D

{tex} \mathrm { CaSO } _ { 4 } \cdot 2 \mathrm { H } _ { 2 } \mathrm { O } {/tex}

Explanation


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Q 18. In the case of alkali metals, the covalent character decreases in the order

A

{tex} M F > M C l > M B r > M I {/tex}

B

{tex} M F > M C 1 > M I > M B r {/tex}

{tex} MI > M B r > M Cl > M F {/tex}

D

{tex} M C l > M I> M B r > M F {/tex}

Explanation


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Q 19. Which of the following oxides is not expected to react with sodium hydroxide?

{tex} \mathrm { CaO } {/tex}

B

{tex} \mathrm { SiO } _ { 2 } {/tex}

C

{tex} \mathrm { BeO } {/tex}

D

{tex} \mathrm { B } _ { 2 } \mathrm { O } _ { 3 } {/tex}

Explanation


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Q 20. Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

A

{tex} \mathrm { MgCl } _ { 2 } {/tex}

B

{tex} \mathrm { CaCl } _ { 2 } {/tex}

C

{tex} \mathrm { SrCl } _ { 2 } {/tex}

{tex} \mathrm { BaCl } _ { 2 } {/tex}

Explanation

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Q 21. The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

A

{tex} \mathrm { NaH } > \mathrm { LiH } > \mathrm { KH } > \mathrm { RbH } > \mathrm { CsH } {/tex}

{tex} \mathrm { LiH } > \mathrm { NaH } > \mathrm { KH } > \mathrm { RbH } > \mathrm { CsH } {/tex}

C

{tex} \mathrm { CsH } > \mathrm { RbH } > \mathrm { KH } > \mathrm { NaH } > \mathrm { LiH } {/tex}

D

{tex} \mathrm { KH } > \mathrm { NaH } > \mathrm { LiH } > \mathrm { CsH } > \mathrm { RbH } {/tex}

Explanation


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Q 22. The suspension of slaked lime in water is known as

A

lime water

B

quick lime

milk of lime

D

aqueous solution of slaked lime.

Explanation


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Q 23. In context with beryllium, which one of the following statements is incorrect?

A

It is rendered passive by nitric acid.

B

It forms {tex} \mathrm { Be } _ { 2 } \mathrm { C } {/tex}

Its salts rarely hydrolyze.

D

Its hydride is electron-deficient and polymeric.

Explanation


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Q 24. The sequence of ionic mobility in aqueous solution is

A

{tex} \mathrm { Rb } ^ { + } > \mathrm { K } ^ { + } > \mathrm { Cs } ^ { + } > \mathrm { Na } ^ { + } {/tex}

B

{tex} \mathrm { Na } ^ { + } > \mathrm { K } ^ { + } > \mathrm { Rb } ^ { + } > \mathrm { Cs } ^ { + } {/tex}

C

{tex} \mathrm { K } ^ { + } > \mathrm { Na } ^ { + } > \mathrm { Rb } ^ { + } > \mathrm { Cs } ^ { + } {/tex}

{tex} \mathrm { Cs } ^ { + } > \mathrm { Rb } ^ { + } > \mathrm { K } ^ { + } > \mathrm { Na } ^ { + } {/tex}

Explanation




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Q 25. The correct order of increasing thermal stability of {tex} \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 } , \mathrm { MgCO } _ { 3 } , \mathrm { CaCO } _ { 3 } {/tex} and {tex} \mathrm { BeCO } _ { 3 } {/tex} is

{tex} \mathrm { BeCO } _ { 3 } < \mathrm { MgCO } _ { 3 } < \mathrm { CaCO } _ { 3 } < \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

B

{tex} \mathrm { MgCO } _ { 3 } < \mathrm { BeCO } _ { 3 } < \mathrm { CaCO } _ { 3 } < \mathrm { K } _ { 2 } \mathrm { CO } {/tex}

C

{tex} \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 } < \mathrm { MgCO } _ { 3 } < \mathrm { CaCO } _ { 3 } < \mathrm { BeCO } _ { 3 } {/tex}

D

{tex} \mathrm { BeCO } _ { 3 } < \mathrm { MgCO } _ { 3 } < \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 } < \mathrm { CaCO } _ { 3 } {/tex}

Explanation