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Which of the following statements is false ?. When burned in air at 1 atm pressure, Li forms a normal oxide. When burned in air at 1 atm pressure, the IA metals (other than Li) form peroxides or superoxides. The IA metal oxides are basic. - PowerPoint PPT Presentation
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Which of the following statements is false?
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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.
Which one of the following compounds or elements is not correctly matched with a use? Substance / Use
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1. NaHCO3 / baking soda
2. NaOH / production of soap
3. K2CO3 / treatment for manic depression
4. KNO3 / a fertilizer
5. Li / heat transfer in experimental nuclear reactors
Which one of the following compounds is not correctly matched with its common name? Compound / Common Name
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1. NaHCO3 / baking soda
2. Na2CO3·10H2O / washing soda
3. KNO3 / niter or saltpeter
4. NaNO3 / caustic soda
5. Na2CO3 / soda or soda ash
Which one of the following metals exhibits the photoelectric effect with the lowest energy radiation, thereby making it useful in photoelectric cells?
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1. Li
2. K
3. Cs
4. Be
5. Ba
Which of the following element(s) is not known to be essential to humans?
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1. Mn
2. Se
3. Zn
4. Sn
5. Cr
Which one of the following is required for thyroid hormones function?
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1. Hg
2. Br
3. Zn
4. Co
5. I
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1. Be
2. Mg
3. Ca
4. Sr
5. Ba
Which one of the following compounds or elements and its uses do not match? Substance / Use
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1. 2MgSO4·H2O / plaster of Paris
2. strontium salts / red color in fireworks
3. BaSO4 / absorbs x-rays
4. Be / windows for x-ray tubes
5. Mg / photographic flash bulbs
Which one of the following is not a post-transition metal?
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1. aluminium
2. cesium
3. bismuth
4. lead
5. gallium
Which one of the following ions hydrolyzes the most extensively?
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1. K+
2. Ca2+
3. Mg2+
4. Al3+
5. Tl3+
Which one of the following has the highest melting point?
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1. Sc
2. Ti
3. Cr
4. Cu
5. Zn
Which one of the following is the strongest oxidizing agent?
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1. Cr(OH)2
2. CrCl3
3. K CrO2
4. K2Cr2O7
5. Cr2O3
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