Q261
Open questionThe constituents of automobile exhaust that can cause cancer is/are :
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Q262
Open questionThe acid rain destroys vegetations because it contains
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Q263
Open questionOf the following, which one pollutes the air of a big city ?
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Q264
Open questionOf the following which one pollutes the air of a big city ?
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Q265
Open questionWhich of the following is usually not an air-pollutant?
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Q266
Open questionWhich of the following pollutants is main product of automobile exhaust ?
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Q267
Open questionThe smog is essentially caused by the presence of
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Q268
Open questionThe depletion in Ozone layer is caused by ________ .
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Q269
Open questionWhich of the following is the maximum number of electrons that can be present in M-shell?
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Q270
Open questionAtoms of different elements have
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Q271
Open questionAll isotopes of the same element have ________
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Q272
Open questionThe fundamental particles present in the nucleus of an atom are
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Q273
Open questionJ.J. Thomson’s proposed model of atom is generally called ________ model.
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Q274
Open questionWhat particles move around the nucleus of an atom and are negatively charged?
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Q275
Open questionAll isotopes of the same element have ______________
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Q276
Open questionAtoms having the same number of protons but different number of neutrons are called :
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Q277
Open questionChemical properties of isotopes
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Q278
Open questionWhich of the following does the nucleus of an atom consists of?
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Q279
Open questionThe nucleus of an atom consists of
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Q280
Open questionThe mass number of a nucleus is
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