Property which is same for the following species is:
N3–, O2–, F–, Na+, Mg2+ and Al3+
1. Ionic radii
2. Number of electrons
3. Nuclear charge
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe ejection of the photoelectron from the silver metal can be stopped by applying a voltage of 0.35 eV when the radiation having a wavelength of 256.7 nm is used. The work function for silver metal is
1. 3.40 eV
2. 5.18 eV
3. 4.48 eV
4. -4.40 eV
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe ionization energy for H atom in the ground state is 2.18 x 10-18 J. The process energy requirements will be: \(( He^+(g) \rightarrow He^{2+}(g) + e^- )\)
1. 8.72 x 10-18 J
2. 7.54 x 10-18 J
3. 5.67 x 10-17 J
4. 2.18 x 10-17 J
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe maximum number of emission lines obtained when the excited electron of the H atom jumps from n = 6 to the ground state is -
1. 30
2. 21
3. 15
4. 28
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyElectrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. The work function (W0 ) of the metal is
1. 3.109 x 10-20 J
2. 2.922 x 10-19 J
3. 4.031 x 1019 J
4. 2.319 x 10-18 J
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe total number of electrons present in one mole of methane is
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe total number and mass of neutrons in 7 mg of 14C would be
(Assume that mass of a neutron = 1.675 × 10–27 kg)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe wave number of a light whose time period is 2.0 × 10–10 s would be
1. 16.66 m-1
2. 1. 66 m-1
3. 32.34 m-1
4. 12.34 m-1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe number of photons of light with a wavelength of 4000 pm that provide 1J of energy would be
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyElectromagnetic radiation of wavelength 242 nm is just sufficient to ionise sodium atom. The ionisation energy of sodium in kJ mol-1 is -
1. 494
2. 4.94
3. 516
4. 0.50
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology