JEE Chemistry S Block Elements MCQs Set 02

Question. Which one of the following properties of alkali metals increases in magnitude as the atomic number rises ?
(a) Ionic radius
(b) Electronegativity
(c) Melting point
(d) First ionization energy

Answer: A

Question. Out of the following elements which one do you expect to be most reactive, chemically ?
(a) Ba
(b) Ca
(c) Mg
(d) Sr

Answer: A

Question. The metals A and B form oxide but B also forms nitride when both burn in air. The A and B are
(a) K, Mg
(b) Mg, Ca
(c) Cs, K
(d) Li, Na

Answer: A

Question. Which of the following is the best method for preparation of BeF₂?
(a) Thermal decomposition of (NH₄)₂BeF₄
(b) Reaction of Be with F₂
(c) Reaction of Be with HF
(d) All of the above are equally effective

Answer: A

Question.  Arrange the following compounds in order of increasing solubility
(i) MgF₂ (ii) CaF₂, (iii) BaF₂
(a) (ii) < (i) < (iii)
(b) (iii) < (ii) < (i)
(c) (i) < (ii) < (iii)
(d) (ii) < (iii) < (ii)

Answer: A

Question. Alkaline earth metals are
(a) reducing agent
(b) dehydrating agent
(c) amphoteric
(d) oxidizing agent

Answer: A

Question. The oxidation state shown by alkaline earth metals is
(a) +2
(b) –2
(c) +1, +2
(d) –1, –2

Answer: A

Question. Which one of the following is the most soluble in water?
(a) Ba(OH)₂
(b) Sr(OH)₂
(c) Mg(OH)₂
(d) Ca(OH)₂

Answer: A

Question. Which of the following alkaline earth metal hydroxides is amphoteric in character
(a) Be(OH)₂
(b) Sr(OH)₂
(c) Ca(OH)₂
(d) Ba(OH)₂

Answer: A

Question. Of the metals Be, Mg, Ca and Sr of group 2 A. In the periodic table the least ionic chloride would be formed by
(a) Be
(b) Ca
(c) Mg
(d) Sr

Answer: A

Question. The order of solubility of sulphates of alkaline earth metals in water is
(a) Be > Mg > Ca > Sr > Ba
(b) Mg > Be >> Ba > Ca > Sr
(c) Be > Ca > Mg > Ba >> Sr
(d) Mg > Ca > Ba >> Be > Sr

Answer: A

Question. The solubilities of carbonates decrease down the magnesium group due to a decrease in
(a) hydration energies of cations
(b) inter-ionic attraction
(c) entropy of solution formation
(d) lattice energies of solids

Answer: A

Question. In which of the following the hydration energy is higher than the lattice energy?
(a) MgSO₄
(b) SrSO₄
(c) RaSO₄
(d) BaSO₄

Answer: A

Question. Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
(a) BeSO₄
(b) SrSO₄
(c) CaSO₄
(d) BaSO₄

Answer: A

Question. Beryllium shows diagonal relationship with aluminium. Which of the following similarity is incorrect ?
(a) Be(OH)₂ like Al(OH)₃ is basic.
(b) Be forms beryllates and Al forms aluminates
(c) Be like Al is rendered passive by HNO₃
(d) None of these

Answer: A

Question. The substance not likely to contain CaCO₃ is
(a) gypsum
(b) sea shells
(c) a marble statue
(d) dolomite

Answer: A

Question. Gypsum on heating at 120 – 130°C gives
(a) hemihydrate
(b) dihydrate
(c) anhydrous salt
(d) monohydrate

Answer: A

Question. Plaster of Paris on making paste with little water sets to hard mass due to formation of
(a) CaSO₄.2H₂O
(b) CaSO₄.1/2H₂O
(c) CaSO₄
(d) None of these

Answer: A

Question. Dead burn plaster is
(a) CaSO₄
(b) MgSO₄. 7H₂O
(c) CaSO₄.2H₂O
(d) None of these

Answer: A

Question. The formula for calcium chlorite is
(a) Ca(ClO₂)₂
(b) Ca(ClO₃)₂
(c) Ca(ClO₄)₂
(d) CaClO₂

Answer: A

Question. The chemical which is used for plastering the broken bones is
(a) (CaSO₄)₂H₂O
(b) FeSO₄. 7H₂O
(c) MgSO₄.7H₂O
(d) None of these

Answer: A

Question. Bone ash contains
(a) Ca₃ (PO₄)₂
(b) CaO
(c) CaSO₄
(d) None of these

Answer: A

Question. Mortar is a mixture of
(a) slaked lime, sand and water
(b) slaked lime and water
(c) CaCO₃, sand and water
(d) CaCO₃ and CaO

Answer: A

Question. Which gas is released when CaCO₃ reacts with dilute HCl?
(a) CO₂
(b) Cl₂
(c) H₂
(d) O₂

Answer: A

Question. Setting of cement is an
(a) exothermic reaction
(b) endothermic reaction
(c) neither endothermic nor exothermic
(d) example of neutralisation reaction

Answer: A

Question. Calcitonin and parathyroid hormone regulate concentration of which of the following element in plasma?
(a) Calcium
(b) Sodium
(c) Magnesium
(d) Potassium

Answer: A

Question. Which of the following metal is found in green colouring pigment chlorophyll of plants?
(a) Mg
(b) Al
(c) Fe
(d) Na

Answer: A

Question. Select the correct statements
(i) Cs⁺ is more highly hydrated that the other alkali metal ions
(ii) Among the alkali metals Li, Na, K and Rb, lithium has the highest melting point
(iii) Among the alkali metals only lithium forms a stable nitride by direct combination with nitrogen
(a) (ii) and (iii)
(b) (i) and (ii)
(c) (i), (ii) and (iii)
(d) (i) and (iii)

Answer: A

Question. Which of the following sequence of T and F is correct for alkali metals ? Here T represents True and F represents False statement.
(i) Alkali metal hydrides are ionic solids with high melting point.
(ii) All alkali halides are ionic in nature.
(iii) Li is the least powerful reducing agent and Na is the most powerful reducing agent.
(a) TFF
(b) TFT
(c) TTT
(d) FTF

Answer: A

Question.  Which of the following statement(s) is/are correct regarding
Li₂CO₃ and Na₂CO₃ ?
(i) Sodium salt evolve CO₂ at higher temperature.
(ii) Polarization of Na⁺ is lesser than that of Li+.
(a) Statement (ii) is correct explanation for statement (i)
(b) Statement (i) is correct explanation for statement (ii)
(c) Both statements (i) and (ii) are incorrect
(d) Both statements (i) and (ii) are correct

Answer: A

Question.  Which of the following sequence of T and F is correct for given statements?
(i) The alkali metal hydroxides are the strongest of all bases.
(ii) All alkali metal halides have high negative enthalpies of formation.
(iii) The stability of the carbonates and hydrogen carbonates of alkali metals decrease with increase in electropositive character down the group.
(iv) Only LiHCO₃ exist as solid.
(a) TTFF
(b) FTFT
(c) TTTT
(d) TFFT

Answer: A

Question. Which of the following statement(s) is/are correct?
(i) The atomic and ionic radii of alkaline earth metals are smaller than those of the corresponding alkali metals in the same periods.
(ii) Second ionisation enthalpies of the alkaline earth metals are smaller than those of the corresponding alkali metals.
(iii) Compounds of alkaline earth metals are more extensively hydrated than those of alkali metals
(a) (i), (ii) and (iii)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (i) and (iii)

Answer: A

Question. Which of the following statements are correct ?
(i) Copper - beryllium alloys are used in the preparation of high strength springs
(ii) Metallic beryllium is used for making window X-ray tubes.
(iii) Magnesium powder is used in incendiary bombs and singnals.
(iv) Barium is used in treatment of cancer.
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i) and (iii)
(d) (i), (ii), (iii) and (iv)

Answer: A

Question.  Which of the following is/are not characteristic property(ies) of alkaline earth metals ?
(i) All alkaline earth metal oxides are basic in nature and forms sparingly soluble hydroxides with water.
(ii) The hydrated chlorides, bromides and iodies of Ca, Sr and Ba on heating undergoes hydrolysis while corresponding hydrated halides of Be and Mg on heating undergo dehydration.
(iii) Nitrates of alkaline earth metals decompose on heating as below
(a) (i) and (ii)
(b) (ii) only
(c) (i) only
(d) (i) and (iii)

Answer: A

Question. Which of the following statement(s) is/are correct regarding Al and Be ?
(i) Both of these react with alkali.
(ii) There is diagonal relationship among these elements
(a) Both (i) and (ii)
(b) Only (ii)
(c) Only (i)
(d) Neither (i) nor (ii)

Answer: A

Question. Assertion: Lithium salts are mostly hydrated.
Reason : The hydration enthalpy of alkali metal ions decreases with increase in ionic sizes.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Compounds of beryllium is largely covalent and get hydrolysed easily.
Reason : This is due to high value of ionisation potential and small size of Be.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Radium is most abundant s-block element.
Reason : s-block elements are non-radioactive in nature
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) None of these

Answer: A

Question. The melting point of lithium (181°C) is just double the melting point of sodium (98°C) because
(a) down the group the cohesive energy decreases
(b) None of these
(c) down the group, the ionization energy decreases

Answer: A

Question. Li has the maximum value of ionisation potential among alkali metals i.e. lithium has the minimum tendency to ionise to give LI⁺ ion. Thus, in aq. solution lithium is
(a) strongest reducing agent
(b) poorest reducing agent
(c) strongest oxidising agent
(d) poorest oxidising agent

Answer: A

Question. Lithium is strongest reducing agent among alkali metals due to which of the following factor?
(a) Hydration energy
(b) Ionization energy
(c) Electron affinity
(d) Lattice energy

Answer: A

Question. Which of the following statements is incorrect?
(a) Dissolution of alkali metal hydroxide is endothermic
(b) Aqueous solution of alkali metal hydroxides are strongly basic
(c) Alkali metal hydroxides form ionic crystals
(d) Alkali metal hydroxide are hygroscopic

Answer: A

Question. Which of the following on thermal decomposition yields a basic as well as acidic oxide ?
(a) CaCO₃
(b) NaNO₃
(c) KClO₃
(d) NH₄NO₃

Answer: A

Question. Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, H₂O₂ and O₂?
(a) NaO₂
(b) Li₂O
(c) Na₂O₂
(d) Na₂O

Answer: A

Question. Which of the following oxides of potassium is not known ?
(a) K₂O₄
(b) K₂O₃
(c) K₂O
(d) KO₃

Answer: A

Question. Suppose an element is kept in air chamber, than air content was evaluated after sometime , oxygen and nitrogen content was found to be low comparitively. The given element will be
(a) Li
(b) Na
(c) Rb
(d) K

Answer: A

Question. Suppose metal react with the oxygen to form oxide, than aqueous solution of this oxide when added to a solution of HI, solution turn yellowish brown in colour. This compound is
(a) Na₂O₂
(b) Li₂O
(c) Na₂O
(d) None 0f these

Answer: A

Question. Which of the following salt of lithium is most soluble in organic solvent ?
(a) LiI
(b) LiCl
(c) LiF
(d) LiBr

Answer: A

Question. Arrange the following in increasing order of their melting point ?
(A) LiCl, (B) NaCl, (C) KCl
(a) A < B < C
(b) C < A < B
(c) B < A < C
(d) None of these

Answer: A

Question. The raw materials in Solvay Process are
(a) NaCl , NH ₃ and CaCO₃.
(b) NaOH, CaO and NH₃
(c) Na₂CO₃ ,CaCO₃ and NH₃
(d) All of these

Answer: A

Question. Compared with the alkaline earth metals, the alkali metals exhibit
(a) lower ionization energies
(b) highest boiling points
(c) smaller ionic radii
(d) greater hardness

Answer: A

Question. Property of the alkaline earth metals that increases with their atomic number is
(a) solubility of their hydroxides in water
(b) solubility of their sulphates in water
(c) ionization energy
(d) electronegativity

Answer: A

Question. Which one of the following does not react with water even under red hot condition?
(a) Be
(b) K
(c) Na
(d) Ca

Answer: A

Question. Magnesium burns in CO₂ to form
(a) MgO + C
(b) MgO + CO
(c) MgO
(d) MgCO₃

Answer: A

Question. Which of the following will precipitate first when aqueous solution containing sulphate ions are added?
(a) Ba²⁺
(b) Ca²⁺
(c) Mg²⁺
(d) Sr²⁺

Answer: A

Question. If the fluoride salts of group 2 metals are dissolved in water, than which of the following will show high solubility?
(a) BaF₂
(b) CaF₂
(c) RbF₂
(d) BeF₂

Answer: A

Question. Aqueous solution of group 2 is precipitated by adding Na₂CO₃, then this precipitate is tested on flame, no light in visible region is observed , this element can be
(a) Mg
(b) Sr
(c) Ba
(d) Ca

Answer: A