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Which of the following statements is false? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.When burned.

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Presentation on theme: "Which of the following statements is false? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.When burned."— Presentation transcript:

1 Which of the following statements is false? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.When burned in air at 1 atm pressure, Li forms a normal oxide. 2.When burned in air at 1 atm pressure, the IA metals (other than Li) form peroxides or superoxides. 3.The IA metal oxides are basic. 4.The IA metal oxides react with water to form weak bases. 5.The IA metals react vigorously with water.

2 Which one of the following compounds or elements is not correctly matched with a use? Substance / Use 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.NaHCO 3 / baking soda 2.NaOH / production of soap 3.K 2 CO 3 / treatment for manic depression 4.KNO 3 / a fertilizer 5.Li / heat transfer in experimental nuclear reactors

3 Which one of the following compounds is not correctly matched with its common name? Compound / Common Name 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.NaHCO 3 / baking soda 2.Na 2 CO 3 ·10H 2 O / washing soda 3.KNO 3 / niter or saltpeter 4.NaNO 3 / caustic soda 5.Na 2 CO 3 / soda or soda ash

4 Which one of the following metals exhibits the photoelectric effect with the lowest energy radiation, thereby making it useful in photoelectric cells? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.Li 2.K 3.Cs 4.Be 5.Ba

5 Which of the following element(s) is not known to be essential to humans? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.Mn 2.Se 3.Zn 4.Sn 5.Cr

6 Which one of the following is required for thyroid hormones function? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.Hg 2.Br 3.Zn 4.Co 5.I

7 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.Be 2.Mg 3.Ca 4.Sr 5.Ba

8 Which one of the following compounds or elements and its uses do not match? Substance / Use 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.2MgSO 4 ·H 2 O / plaster of Paris 2.strontium salts / red color in fireworks 3.BaSO 4 / absorbs x-rays 4.Be / windows for x-ray tubes 5.Mg / photographic flash bulbs

9 Which one of the following is not a post-transition metal? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.aluminium 2.cesium 3.bismuth 4.lead 5.gallium

10 Which one of the following ions hydrolyzes the most extensively? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.K + 2.Ca 2+ 3.Mg 2+ 4.Al 3+ 5.Tl 3+

11 Which one of the following has the highest melting point? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.Sc 2.Ti 3.Cr 4.Cu 5.Zn

12 Which one of the following is the strongest oxidizing agent? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.Cr(OH) 2 2.CrCl 3 3.K CrO 2 4.K 2 Cr 2 O 7 5.Cr 2 O 3

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