{"id":17611,"date":"2021-02-02T17:14:13","date_gmt":"2021-02-02T11:44:13","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=17611"},"modified":"2021-02-03T13:00:23","modified_gmt":"2021-02-03T07:30:23","slug":"mcq-questions-for-class-11-chemistry-chapter-10","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-11-chemistry-chapter-10\/","title":{"rendered":"MCQ Questions for Class 11 Chemistry Chapter 10 The s-Block Elements with Answers"},"content":{"rendered":"

Students are advised to practice the\u00a0NCERT MCQ Questions for Class 11 Chemistry Chapter 10 The s-Block Elements with Answers Pdf free download is available here. MCQ Questions for Class 11 Chemistry with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these The s-Block Elements Class 11 MCQs Questions with Answers and assess their preparation level.<\/p>\n

The s-Block Elements Class 11 MCQs Questions with Answers<\/h2>\n

Solving the The s-Block Elements Multiple Choice Questions of Class 11 Chemistry Chapter 10 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on The s-Block Elements Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 10 Chemistry Class 11 and cross-check your answers during preparation.<\/p>\n

Question 1.
\nBeryllium shows diagonal relationship with
\n(a) Mg
\n(b) Na
\n(c) Al
\n(d) B.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Al
\nExplanation:
\nJust as Li shows resemblance with its diagonally opposite element Al. This is because the two elements have the same electronegativity (Be = 1.5, Al = 1.5) and possess similar polarizing power (i.e., charge\/radius).<\/p>\n<\/details>\n

\n

Question 2.
\nWhich of the following metal has stable carbonates?
\n(a) Na
\n(b) Mg
\n(c) Al
\n(d) Si<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Na
\nExplanation:
\nWhen carbonates are heated they decompose to form the oxide. Sodium carbonate and potassium carbonate do not decompose. The carbonates become more difficult to decompose as we go down the group.<\/p>\n<\/details>\n

\n

Question 3.
\nThe reaction of Cl2<\/sub> with X gives bleaching powder X is
\n(a) CaO
\n(b) Ca(OH)2<\/sub>
\n(c) Ca(OCl)2<\/sub>
\n(d) Ca(O3<\/sub>Cl)2<\/sub><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Ca(OCl)2<\/sub>
\nExplanation:
\nCalcium hypochlorite is a compound with formula Ca (ClO)2<\/sub>. As a mixture with lime and calcium chloride, it is marketed as chlorine powder or bleach powder for water treatment and as a bleaching agent.
\nCalcium hypochlorite is produced industrially by treating lime (Ca(OH)2<\/sub>) with chlorine gas.
\n2Cl2<\/sub> + 2Ca(OH)2<\/sub> \u2192 Ca(OCl)2<\/sub> + CaCl2<\/sub> + 2H2<\/sub>O<\/p>\n<\/details>\n

\n

Question 4.
\nNaOH is prepared by the method
\n(a) Downs cell
\n(b) Castner cell
\n(c) Solvay process
\n(d) Castner – Kellner cell.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Castner – Kellner cell.
\nExplanation:
\nIn the Castner-Kellner method, electrolysis of brine solution is performed in order to obtain sodium hydroxide.<\/p>\n<\/details>\n

\n

Question 5.
\nMilk of lime reacts with chlorine to form ________, a constituent of bleaching powder.
\n(a) Ca(OCI)2<\/sub>
\n(b) Ca(CIO2<\/sub>)2<\/sub>
\n(c) Ca(CIO3<\/sub>)2<\/sub>
\n(d) Ca(CIO4<\/sub>)2<\/sub><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Ca(OCI)2<\/sub>
\nExplanation:
\nMilk of lime reacts with chlorine to form bleaching powder.
\n2Ca(OH)2<\/sub> + 2Cl2<\/sub> \u2192 CaCl2<\/sub> + Ca(OCl)2<\/sub> + 2H2<\/sub>O<\/p>\n<\/details>\n

\n

Question 6.
\nWhich one of these are main components of kidney stones?
\n(a) Sodium Oxalate
\n(b) Potassium Oxalate
\n(c) Calcium Oxalate
\n(d) Copper Oxalate<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Calcium Oxalate
\nExplanation:
\nCalcium oxalate is the main component of kidney stone.<\/p>\n<\/details>\n

\n

Question 7.
\nA nitrate of an alkali metal M on heating gives O2<\/sub>.NO2<\/sub> and M2<\/sub>O. The metal M will be:
\n(a) Na
\n(b) K
\n(c) Rb
\n(d) Li<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Li
\nExplanation:
\nAll group 1 compounds (metal nitrates) decompose to give metal nitrates and
\noxygen \u2192 2MNO3<\/sub> \u200b\u2192 2MNO2<\/sub> + O2<\/sub>
\n\u200bSince Lithium shows diagonal relationship with magnesium, it shows different behaviour
\n4LiNO3<\/sub>\u200b \u2192 2Li2<\/sub>\u200bO + 4NO2<\/sub> \u200b+ O2<\/sub>
\n\u200b(Its nitrate decomposes like Group 2 elements)<\/p>\n<\/details>\n

\n

Question 8.
\nWhich of the following metal carbonates decompose on heating?
\n(a) LiCO3<\/sub> & MgCO3<\/sub>
\n(b) Na2<\/sub>CO3<\/sub>
\n(c) K2<\/sub>CO3<\/sub>
\n(d) None of the Above<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) LiCO3<\/sub> & MgCO3<\/sub>
\nExplanation:
\nLithium carbonate and magnesium carbonate are thermally unstable. They decompose on heating. Properties of Li are similar to Mg because of diagonal relationship.
\nLi2<\/sub>CO3<\/sub> \u2192 Li2<\/sub>O + CO2<\/sub>
\nMgCO3<\/sub> \u2192 MgO + CO2<\/sub>
\nLi2<\/sub>\u200bCO3<\/sub> and MgCO3<\/sub> are salts of weak acid (CO2<\/sub>) with weak bases LiOH and Mg(OH)2<\/sub>. On the other hand, NaOH and KOH are much stronger bases and can hold the CO2<\/sub> easily. Thus, sodium carbonate and potassium carbonate are thermally stable. They do not decompose on heating.<\/p>\n<\/details>\n

\n

Question 9.
\nWhich of the following alkaline earth metals do not impart any color to the flame?
\n(a) Ca,Sr
\n(b) Mg,Ca
\n(c) Be,Mg
\n(d) Sr,Ba<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Mg,Ca
\nExplanation:
\nRelative to other group 2 elements, Be and Mg atoms are smaller in size. Thus, the electrons in Be and Mg are too strongly bound to get excited by flame. In other words, the energy required to excite electrons in Be and Mg atoms does not lie in the visible range.<\/p>\n<\/details>\n

\n

Question 10.
\nWhich one of the following alkali metals emit light of longest wavelength in the flame test ?
\n(a) Na
\n(b) K
\n(c) Cs
\n(d) Li<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) K
\nExplanation:
\nActually Rb emits the longest wavelength light in flame test. Since Rb is one there in the options, therefore, correct option should be K<\/p>\n<\/details>\n

\n

Question 11.
\nWhat will be final weight of 286 gm Na2<\/sub>CO3<\/sub>.10H2<\/sub>O by Heating at 373 K?
\n(a) 206 gm
\n(b) 162 gm
\n(c) 186 gm
\n(d) 124 gm<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) 124 gm<\/p>\n<\/details>\n

\n

Question 12.
\nSolubilities of carbonates decrease down the magnesium group due to decrease in
\n(a) Entropy of solution formation
\n(b) Lattice energies of solids
\n(c) Hydration energy of cations
\n(d) Inter – ionic attraction.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Hydration energy of cations
\nExplanation:
\nThe stability of the carbonates of the alkaline earth metals increases on moving down the group. The solubility of carbonate of metals in water is generally low. However, they dissolve in water containing CO2<\/sub> yielding bicarbonates, and this solubility decreases on going down in a group with the increase in stability of carbonates of metals, and decrease in hydration energy of the cations.<\/p>\n<\/details>\n

\n

Question 13.
\nWhat are the products formed when Li2<\/sub>CO3<\/sub> undergoes decomposition?
\n(a) Li2<\/sub>O2<\/sub>, CO
\n(b) Li2<\/sub>O, CO
\n(c) Li2<\/sub>O, CO2<\/sub>
\n(d) LiO2<\/sub>, CO<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Li2<\/sub>O, CO2<\/sub>
\nExplanation:
\nLithium carbonate is unstable carbonate due to polarizing power of Li+<\/sup>. Hence it undergoes easy dissociation just like alkaline earth metal carbonates upon heating to give lithium oxide and carbon dioxide.
\nLi2<\/sub>CO3<\/sub> \u2192 Li2<\/sub>O + CO2<\/sub><\/p>\n<\/details>\n

\n

Question 14.
\nAlkali metals give a _________ when dissolved in liquid ammonia
\n(a) Deep blue solution
\n(b) Colourless
\n(c) Red colour
\n(d) None of the Above<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Deep blue solution
\nExplanation:
\nWhen an alkali metal is dissolved in liquid ammonia, it results in the formation of a deep blue coloured solution. The ammoniated electrons absorb energy corresponding to a red region of visible light. Therefore, the transmitted light is blue in colour.<\/p>\n<\/details>\n

\n

Question 15.
\n_______ does not exhibit coordination number more than four.
\n(a) Magnesium
\n(b) Beryllium
\n(c) Calcium
\n(d) None of the Above<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Beryllium
\nExplanation:
\nBeryllium does not exhibit coordination number more than four as in its valence shell there are only four orbitals. The remaining members of the group can have a coordination number of six by making use of d-orbitals.<\/p>\n<\/details>\n

\n

Question 16.
\nThe composition of Sorels cement is
\n(a) KCl \u00d7 MgCl2<\/sub> \u00d7 6H2<\/sub>O
\n(b) MgCl2<\/sub> \u00d7 5MgO \u00d7 (xH2<\/sub>O)
\n(c) MgCO3<\/sub> \u00d7 CaCO3<\/sub>
\n(d) CaSO4<\/sub> \u00d7 2H2<\/sub>O<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) MgCl2<\/sub> \u00d7 5MgO \u00d7 (xH2<\/sub>O)
\nExplanation:
\nMixture of MgCl2<\/sub> and MgO is called Sorels cement. It is MgCl2<\/sub> \u00d7 5MgOx (xH2<\/sub>O).<\/p>\n<\/details>\n

\n

Question 17.
\nWhich of the following metals is most commonly used in photo – chemical cells?
\n(a) Lithium
\n(b) Calcium
\n(c) Caesium
\n(d) Francium<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Caesium
\nExplanation:
\nAmong the given metals, Cesium(Cs) has lowest ionization enthalpy. Hence it loses electrons readily. Therefore, cesium is used in solar cells.<\/p>\n<\/details>\n

\n

Question 18.
\nhe wire of flash bulb is made up of:
\n(a) Mg
\n(b) Ag
\n(c) Cu
\n(d) Ba<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Mg
\nExplanation:
\nMagnesium metal is used for the preparation of the wire of flash bulb.<\/p>\n<\/details>\n

\n

Question 19.
\nWhich of the following metals is not manufactured by electrolysis ?
\n(a) Na
\n(b) Mg
\n(c) Al
\n(d) Fe<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Fe
\nExplanation:
\nMethod of extraction of a metal depends on the reactivity of the metal. Iron (Fe) is not manufacture by electrolysis. Moderately reactive metals like zinc and iron are extracted by reduction of their oxides using carbon.<\/p>\n<\/details>\n

\n

Question 20.
\nWhich elements of s- block are largely found in biological fluids?
\n(a) Sodium, Potassium
\n(b) Magnesium and Calcium
\n(c) Both (1) and (2) are true
\n(d) None of the Above<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Both (1) and (2) are true
\nExplanation:
\nMono valent sodium and potassium ions and divalent magnesium and calcium ions are found in large proportions in biological fluids. These ions perform important biological functions such as maintenance of ion balance and nerve impulse conduction.<\/p>\n<\/details>\n

\n

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