Atoms of an element differ from those of all other elements in
1 Atomic number and electronic configuration
2 Atomic number and number of valence electrons
3 Number of neutrons and electronic configuration
4 None of these
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In vulcanization, natural rubber is heated with 1 Carbon 2 Sulphur 3 Silicon 4 Phosphorus
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Isotopes are separated by 1 Filtration 2 Sublimation 3 Distillation 4 Crystallization
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Brass is an alloy of 1 Nickel and copper 2 Zinc and copper 3 Nickel and zinc 4 Nickel and silver
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The group of metals Fe, Co, Ni may be best called as 1 Alkali metals 2 Rare metals 3 Main group metals 4 Transition metals
Which isotope of Uranium is capable of sustaining chain reaction ?
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Mesons are found in 1 ?-rays 2 Laser beam 3 X-rays 4 Cosmic rays
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Superphosphate fertilizer is prepared by the reaction between 1 Calcium phosphate and Sulphuric hydroxide 2 Sodium phosphate and Sodium nitrate 3 Magnesium phosphate and Sodium nitrate 4 Sodium sulphate and Phosphoric acid
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