Important Questions From S Block Elements For Class 11

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Questions
1 Dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl26H2O, BaCl2.2H2O, SrCl2.2H2O, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?
A act as dehydrating agent
B can absorb moisture from air
C Tendency to form hydrate decreases from calcium to barium
D All of the above

Answer:All of the above
2 Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterised by which of the following properties?
A High boiling point
B High negative standard electrode potential
C High density
D Large atomic size

Answer:B, D
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3 Several sodium compounds find use in industries. Which of the following compounds are used for textile industry?
A Na2CO3
B NaHCO3
C NaOH
D NaCl

Answer:A, C
4 Which of the following compounds are readily soluble in water?
A BeSO4
B MgSO4
C BaSO4
D SrSO4

Answer:A, B
5 When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?
A H+ ions
B Mg2+ ions
C Ca2+ ions
D S-Block Element

Answer:B, C
6 Identify the correct formula of halides of alkaline earth metals from the following.
A BaCl2.2H2O
B BaCl2.4H2O
C CaCl2.6H2O
D SrCl2.4H2O

Answer:A, C
7 Choose the correct statements from the following.
A Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
B Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of Be2+ overcomes the lattice enthalpy factor.
C Beryllium exhibits coordination number more than four.
D Beryllium oxide is purely acidic in nature.

Answer:A, B
8 Which of the following are the correct reasons for anomalous behaviour of lithium?
A Exceptionally small size of its atom
B Its high polarising power
C It has high degree of hydration
D Exceptionally low ionisation enthalpy

Answer:A, B
9 Assertion (A): The carbonate of lithium decomposes easily on heating to form lithium oxide and CO2.

Reason (R) : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li2O and CO2.

A Both A and R are correct and R is the correct explanation of A.
B Both A and R are correct but R is not the correct explanation of A.
C Both A and R are not correct
D A is not correct but R is correct.

Answer:Both A and R are correct and R is the correct explanation of A.
10 Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide.

Reason (R) : Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.

A Both A and R are correct and R is the correct explanation of A.
B Both A and R are correct but R is not the correct explanation of A.
C Both A and R are not correct.
D A is not correct but R is correct.

Answer:Both A and R are correct and R is the correct explanation of A.
11 Find the incorrect trend for alkaline earth metals
A atomic size Be < Mg < Ca < Sr
B second ionization energy Be < Mg < Ca < Sr
C Hydration enthalpy Sr < Ca < Mg < Be
D Density Ca < Mg < Be < Sr

Answer:second ionization energy Be < Mg < Ca < Sr
12 Which one is known as a fusion mixture?
A Na2CO3 + NaHCO3
B Na2CO3 + NaOH
C Na2CO3 + K2SO4
D Na2CO3 + K2CO3

Answer:Na2CO3 + K2CO3
13 The tendency to lose their valance electron easily by alkali metals makes them
A strong reducing agent
B weak reducing agent
C strong oxidising agent
D weak oxidising agent

Answer:strong reducing agent
14 Be shows the diagonal relationship with
A Na
B Al
C Mg
D B

Answer:Al
15 Which oxide is amphoteric?
A BaO
B CaO
C BeO
D MgO

Answer:BeO
16 Plaster of Paris (POP) is
A CaSO4 H2O
B CaSO4 2H2O
C CaSO4
D CaSO4 1/2H2O

Answer:CaSO4 1/2H2O
17 Which one is the most stable carbonate?
A BaCO3
B MgCO3
C CaCO3
D BeCO3

Answer:BaCO3
18 As compared to K, Na has
A higher ionization potential
B lower melting point
C lower electronegativity
D larger atomic radius

Answer:higher ionization potential
19 Which of the ions have maximum hydration energy?
A Sr2+
B Ca2+
C Mg2+
D Be2+

Answer:Be2+
20 Which of the compounds is known as Slaked lime?
A CaO
B CaSO4
C Ca(OH)2
D CaCO3

Answer:Ca(OH)2

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