atoms and molecules class 9 mcq

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

There is no difference between valency and valence electrons except in case of 1) elements of group 2 2) elements of group 3 3) elements of group 4 4) elements of group 5

Calcium has 20 electrons. These occupy K,L,M, and N shells. Which shell or shells are incomplete 1) L,M,N shells 2) M,N shells 3) N shells 4) K,L,M,N shells

The size of an atom is decided by 1) mass of the atom 2) no. of protons 3) no. of protons and neutrons 4) no. of electrons

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atoms and molecules class 9 mcq

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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There is no difference between valency and valence electrons except in case of 1) elements of group 2 2) elements of group 3 3) elements of group 4 4) elements of group 5

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Calcium has 20 electrons. These occupy K,L,M, and N shells. Which shell or shells are incomplete 1) L,M,N shells 2) M,N shells 3) N shells 4) K,L,M,N shells

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The size of an atom is decided by 1) mass of the atom 2) no. of protons 3) no. of protons and neutrons 4) no. of electrons

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