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What are the major differences between metals and non-metals?
Metals Non–metals 1. Metals can lose electrons easily. 1. Non-metals cannot lose electrons easily. 2. Metals cannot gain electrons easily. 2. Non-metals can gain electrons easily. 3. Metals generally form ionic compounds. 3. Non–metals generally form covalent compounds. 4. Metals...
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The two forms of oxygen found in the atmosphere are (a) water and ozone (b) water and oxygen (c) ozone and oxygen (d) water and carbon-dioxide
(c) ozone and oxygen
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Compare the alkali metals and alkaline earth metals with respect to
(i) Ionisation enthalpy: The first ionisation enthalpies of alkaline earth metals are higher than those ) of alkali metal because of increased nuclear charge, However 2nd ionisation enthalpies of alkaline...
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Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals.
Thermal stability: - Carbonates: - The carbonates of alkali metals except lithium carbonate are stable towards heat. The carbonates of alkaline earth metals and Lithium carbonate decompose on heating to form...
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Elements with valency 1 are (a) always metals (b) always metalloids (c) either metals or non-metals (d) always non-metals
(c) either metals or non-metals
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Two elements X and Y combine in a ratio of 3:8 by mass and the compound ‘Z’ is formed.
(a) ‘X’ and ‘Y’ are C (carbon) and O (oxygen). These combine in ratio of 12:32 i.e., 3:8. ‘Z’ is CO2(carbon dioxide) (b) ‘X’ is carbon (atomic number 6) so its...
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Hydrogen and oxygen combine in the ratio of 1 : 8 by mass to form water. What mass of oxygen
It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then, the mass of oxygen gas required to react completely with 1g of...
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Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
(a) Iodine (b) Bromine (c) Graphite (d) Carbon (e) Sulphur, phosphorus (f) Oxygen
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Which of the following statements is correct? a. All metals are ductile. b. All non-metals are ductile. c. Generally, metals are ductile.
(c) Generally, metals are ductile. However, mercury metal - a liquid at room temperature - cannot be drawn into wires and is not ductile.
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Explain, Most metal oxides are insoluble in water but some of these dissolve in water. What are these oxides
These oxides are called basic oxides and their solutions in water are called alkalis.
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