CHAPTER THE S-BLOCK ELEMENTS

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1 90 CHAPTER THE S-BLOCK ELEMENTS 1. Which one of the following properties of alkali metals increases in magnitude as the atomic number rises? [1989] (a) Ionic radius (b) Melting point (c) Electronegativity (d) First ionization energy. 2. Which of the following atoms will have the smallest size? [1989] (a) Mg (b) Na (c) Be (d) Li 3. Compared with the alkaline earth metals, the alkali metals exhibit [1990] (a) Smaller ionic radii (b) Highest boiling points (c) Greater hardness (d) Lower ionization energies. 4. Washing soda has formula [1990] (a) Na2CO3.7H2O (b) Na2CO3.10H2O (c) Na2CO3.3H2O (d) Na2CO3 5. Electronic configuration of calcium atom may be written as [1992] (a) Ne, 4p 2 (b) Ar, 4s 2 (c) Ne, 4s 2 (d) Ar, 4p 2 6. Which one of the following has minimum value of cation/anion ratio. [1993] (a) NaCl (b) KCl (c) MgCl2 (d) CaF2 7. Which of the following has largest size? [1993] (a) Na (b) Na + (c) Na (d) Can t be predicted 8. Which of the following is known as fusion mixture? [1994] (a) Mixture of Na2CO3 + NaHCO3 (b) Na2CO3.10H2O (c) Mixture of K2CO3 + Na2CO3 (d) NaHCO3 9. All the following substances react with water. The pair that gives the same gaseous product is [1994] (a) K and KO2 (b) Na and Na2O2 (c) Ca and CaH2 (d) Ba and BaO2 10. Among the following oxides, the one which is most basic is [1994] (a) ZnO (b) MgO (c) Al2O3 (d) N2O5 11. Which of the following metal ions plays an important role in muscle contraction? [1994] (a) K + (b) Na + (c) Mg 2+ (d) Ca Which of the following statement is false? [1994] (a) Strontium decomposes water readily than beryllium (b) Barium carbonate melts at a higher temperature than calcium carbonate (c) Barium hydroxide is more soluble in water than magnesium hydroxide (d) Beryllium hydroxide is more basic than barium hydroxide.

2 Sodium is made by the electrolysis of a molten mixture of about 40% NaCl and 60% CaCl2 because [1995] (a) (b) (c) (d) 14. Identify the correct statement [1995] (a) gypsum is obtained by heating plaster of Paris (b) plaster of Paris can be obtained by hydration of gypsum (c) plaster of paris is obtained by partial oxidation of gypsum (d) gypsum contains a lower percentage of calcium than plaster of Paris 15. Aqueous solution of sodium carbonate absorbs NOand NO2 to give [1996] (a) CO2 + NaNO3 (b) CO2 + NaNO2 (c) NaNO2 + CO (d) NaNO3 + CO 16. Which one is the correct statement with reference to solubility of MgSO4 in water? [1996] (a) SO4 2 ion mainly contributes towards hydration energy (b) Sizes of Mg 2+ and SO4 2 are similar (c) Hydration energy of MgSO4 is higher in comparison to its lattice energy (d) Ionic potential (charge/radius ratio) of Mg 2+ is very low 17. Calcium is obtained by the [1997] (a) electrolysis of solution of calcium chloride in water (b) electrolysis of molten anhydrous calcium chloride or fused calcium chloride (c) roasting of limestone (d) reduction of calcium chloride with carbon 18. In crystals of which one of the following ionic compounds would you expect maximum distance between centres of cations and anions? [1998] (a) LiF (b) CsF (c) CsI (d) LiI 19. In which of the following processes, fused sodium hydroxide is electrolysed at a 330ºCtemperature for extraction of sodium? [2000] (a) Castner's process (b) Down's process (c) Cyanide process (d) Both 'b' and 'c' 20. Asolid compound X on heating gives CO2 gas and a residue. The residue mixed with water forms Y. On passing an excess of CO2 through Y in water, a clear solution Z, is obtained. On boiling Z, a compound X is reformed. The compound X is [2004] (a) Ca(HCO3) 2 (b) CaCO3 (c) Na2CO3 (d) K2CO3 21. The correct order of the mobility of the alkali metal ions in aqueous solutions is [2006] (a) Na + > K + > Rb + > Li + (b) K + > Rb + > Na + > Li + (c) Rb + >K + > Na + > Li + (d) Li + > Na + > K + > Rb The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is [2007] (a) BeCO3 < MgCO3 < CaCO3 < K2CO3 (b) MgCO3 < BeCO3 < CaCO3 < K2CO3 (c) K2CO3 < MgCO3 < CaCO3 < BeCO3 (d) BeCO3 < MgCO3 < K2CO3 < CaCO3 23. In which of the following the hydration energy is higher than the lattice energy? [2007] (a) MgSO4 (b) RaSO4 (c) SrSO4 (d) BaSO4

3 The sequence of ioinic mobility in aqueous solution is: [2008] (a) K + > Na + > Rb + > Cs + (b) Cs + > Rb + > K + > Na + (c) Rb + > K + > Cs + > Na + (d) Na + > K + > Rb + > Cs 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? [2008] (a) CsH> RbH> KH> NaH> LiH (b) KH> NaH> LiH> CsH> RbH (c) NaH> LiH> KH> RbH> CsH (d) LiH> NaH> KH> RbH> CsH 26. Which of the following oxides is not expected to react with sodium hydroxide? [2009] (a) CaO (b) SiO2 (c) BeO (d) B2O3 27. Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy? [2010] (a) CaSO4 (b) BeSO4 (c) BaSO4 (d) SrSO4 28. Property of the alkaline earth metals that increases with their atomic number: [2010] (a) Solubility of their hydroxides in water (b) Solubility of their sulphates in water (c) Ionization energy (d) Electronegativity 29. The compound Aon heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO2 is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid Con gentle heating gives back A. The compound is [2010] (a) CaSO4.2H2O (b) CaCO3 (c) Na2CO3 (d) K2CO3 30. Which of the following compounds has the lowest melting point? [2011] (a) CaCl2 (b) CaBr2 (c) CaI2 (d) CaF2 31. Which one of the following is present as an active ingredient in bleaching powder for bleaching action? [2011] (a) CaOCl2 (b) Ca(OCl) 2 (c) CaO2Cl (d) CaCl2 32. Which of the following statements is incorrect? [2011M] (a) Pure sodium metal dissolves in liquid ammonia to give blue solution. (b) NaOHreacts with glass to give sodium silicate (c) Aluminium reacts with excess NaOH to give Al(OH) 3 (d) NaHCO3 on heating gives Na2CO3 33. (a) (b) (c) (d) 34. Which one of the alkali metals, forms only, the normal oxide, M2Oon heating in air? [2012] (a) Rb (b) K (c) Li (d) Na 35. The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order: [2012] (a) Li + < K + < Na + < Rb + (b) Rb + < K + <Na + < Li + (c) K + < Na + < Rb + < Li + (d) Na + < Li + < K + < Rb +

4 In the replacement reaction CI + MFCF + MIThe reaction will be most favourable if Mhappens to be: [2012 M] (a) Na (b) K (c) Rb (d) Li In Castner-Kellner cell for production of sodium hydroxide: [NEETKar. 2013] (a) Brine is electrolyzed with Pt electrodes (b) Brine is electrolyzed using graphite electrodes (c) Molten sodium chloride is electrolysed (d) Sodium amalgam is formed at mercury cathode

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