class 9 mcq

Among the following which elements can show multiple valencies 1) sulphur 2) phosphorus 3) sodium 4) both a, b

The isotope of iodine is used in the treatment of 1) cancer 2) goitre 3) age of fossil 4) fuel in nuclear react

The number of isotopes that are exhisted for both xenon and cesium are 1) 46 2) 16 3) 26 4) 36

Calcium, Magnesium, Sulphur and Chlorine have atomic numbers 20, 12, 16, 17 respectively. Which of these does not show a valency of 2? 1) Calcium 2) Magnesium 3) Sulphur 4) Chlorine

Which one is not true for two isotopes? 1) Similar mass number 2) Similar atomic number 3) Similar chemical properties 4) Similar electronic configurations

If a neutral atom has three shells completely filled up, then the number electrons of the atom is 1) 28 2) 32 3) 30 4) 18

Mass number of an element can be obtained by adding 1) Number of electrons and neutrons 2) number of protons and neutrons 3) number if electrons and protons 4) number of electrons, protons and neutrons

Rutherford alpha- particle scattering experiment was responsible for the discovery of 1) Nucleus 2) neutron 3) mass number 4) atomic number

Which of the following statements is wrong for the model of an atom as proposed by Rutherford 1) The atom consists of a positively charged centre called nucleus 2) Nucleus consists of protons and neutrons 3) Most of the mass is concentrated in the nucleus 4) The volume of nucleus is very small as compared to the total volume of the atom

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class 9 mcq

Isotopes have different physical properties due to 1) same number of protons 2) same number of electrons 3) same number of neutrons 4) Different number of neutrons or different mass numbers

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Among the following which elements can show multiple valencies 1) sulphur 2) phosphorus 3) sodium 4) both a, b

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The isotope of iodine is used in the treatment of 1) cancer 2) goitre 3) age of fossil 4) fuel in nuclear react

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The number of isotopes that are exhisted for both xenon and cesium are 1) 46 2) 16 3) 26 4) 36

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Calcium, Magnesium, Sulphur and Chlorine have atomic numbers 20, 12, 16, 17 respectively. Which of these does not show a valency of 2? 1) Calcium 2) Magnesium 3) Sulphur 4) Chlorine

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Which one is not true for two isotopes? 1) Similar mass number 2) Similar atomic number 3) Similar chemical properties 4) Similar electronic configurations

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If a neutral atom has three shells completely filled up, then the number electrons of the atom is 1) 28 2) 32 3) 30 4) 18

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Mass number of an element can be obtained by adding 1) Number of electrons and neutrons 2) number of protons and neutrons 3) number if electrons and protons 4) number of electrons, protons and neutrons

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Rutherford alpha- particle scattering experiment was responsible for the discovery of 1) Nucleus 2) neutron 3) mass number 4) atomic number

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