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Which of the following species has more number of
electrons in comparison with the neutrons ?
1. ${\mathrm{Al}}^{3+}$
2. ${\mathrm{O}}^{2-}$
3. ${\mathrm{F}}^{-}$
4. C

The electronic configuration of a dipositive ion M²⁺ is 2,
8, 14 and its mass number is 56. The number of neutrons
present in
1. 32
2. 42
3. 30
4. 34

The work function of a metal is 4.2 eV. If radiations of
2000 Å fall on the metal then the kinetic energy of the
fastest photoelectron is
1. 1.6 × 10^–19 J
2. 16 × 10¹⁰ J
3. 3.2 × 10^–19 J
4. 6.4 × 10^–10 J

 The relationship between the energy \(E_1\) of radiation with a wavelength of \(8000\) Å and the energy \(E_2\)​ of radiation with a wavelength of \(1600\) Å is:
1. \(E_1=2E_2\)
2. \(E_1=4E_2\)
3. \(E_1=6E_2\)
4. \(E_1=E_2\)${\mathrm{}}_{}$

According to Bohr’s theory the angular momentum of an
electron in the fourth orbit is
1. $\frac{h}{2\mathrm{\pi }}$
2. $\frac{2h}{\mathrm{\pi }}$
3. $\frac{3h}{2\mathrm{\pi }}$
4. $\frac{3h}{\mathrm{\pi }}$

The transition of electrons in H atom that will emit
maximum energy is :
1. ${\mathrm{n}}_3\to {\mathrm{n}}_2$
2. ${\mathrm{n}}_4\to {\mathrm{n}}_3$
3. ${\mathrm{n}}_5\to {\mathrm{n}}_4$
4. ${\mathrm{n}}_6\to {\mathrm{n}}_5$

The transition in He⁺ ion that would have the same wave
number as the first Lyman line in hydrogen spectrum is:
1. $2\to 1$
2. $5\to 3$
3. $4\to 2$
4. $6\to 4$

For the electronic transition from n = 2$\to$ n =1 which of
the following will produce shortest wavelength ?
1. H atom
2. D atom
3. He⁺ ion
4. Li²⁺ ion

If the speed of electron in Bohr first orbit of hydrogen
atom be x, then speed of the electron in 3rd orbit is :
1. x/9
2. x/3
3. 3x
4. 9x

In Bohr’s model of the hydrogen atom the ratio between
the period of revolution of an electron in the orbit n = 1 to
the period of revolution of the electron in the orbit n = 2 is
1. 1 : 2
2. 2 : 1
3. 1 : 4
4. 1 : 8

If uncertainties in the measurement of position and
momentum are equal, the uncertainty in the measurement
of velocity is:
1. $\frac{1}{2}\sqrt{\frac{mh}{\mathrm{\pi }}}$
2. $\frac{1}{2\mathrm{\pi }}\sqrt{\frac{h}{m}}$
3. $\frac{1}{2m}\sqrt{\frac{h}{\mathrm{\pi }}}$
4. None of these

How many electrons in ₁₉K have n = 3; l = 0?
1. 1
2. 2
3. 4
4. 3

The electronic configuration of Mn can be written as :
1. $\left[\mathrm{Ar}\right]4s^2$
2. $\left[\mathrm{Ar}\right]3d^6,4s^2$
3. $\left[\mathrm{Ar}\right]3d^5,4s^1$
4. $\left[\mathrm{Ar}\right]3d^5,4s^2$

Which of the following sets of quantum numbers is
impossible arrangement ?
1. n = 3, m = –2, s=+1/2
2. n = 4, m = 3, s = +1/2
3. n = 5, m = 2, s=–1/2
4. n = 3, m = –3, s = –1/2

One unpaired electron causes magnetic moment of 1.1
BM. The magnetic moment of ₂₆Fe²⁺ is :
1. 4.4
2. 5.5
3. 2.2
4. 0

For d-electron, the orbital angular momentum is
1. $\sqrt{6}\frac{h}{2\mathrm{\pi }}$
2. $\sqrt{2}\frac{h}{2\mathrm{\pi }}$
3. $\frac{h}{2\mathrm{\pi }}$
4. $\frac{2h}{\mathrm{\pi }}$

The First ionisation enthalpies of Na,Mg,Al and Si are in the order
1. Na < Mg > Al < Si
2. Na > Mg > Al > Si
3. Na < Mg < Al < Si
4. Na > Mg > Al < Si

Which of the following is smallest in size?
1. Na⁺
2. F^–
3. O^2–
4. N^3–

For electron affinity of halogens, which of the following is correct?
1. Br > F
2. F > Cl
3. Br > Cl
4. F > I

Which species among the following exhibits the highest electron affinity?
1. F^–
2. O^–
3. O
4. Na

Most basic oxide is
1. N₂O₃
2. N₂O₅
3. Bi₂O₅
4. Bi₂O₃

Which of largest in size?
1. Li⁺(aq)
2. Cs⁺(aq)
3. Li⁺(g)
4. Cs⁺(g)

The correct order of 3rd ionisation potential of Na, Mg, Al and Si is
1. Si > Al > Mg > Na
2. Mg > Si > Al > Na
3. Mg > Na > Si > Al
4. Mg > Na > Al > Si

Which pair has largest size difference?
1. Na and Na⁺
2. Na and K
3. Cl and Cl^–
4. Mg and Mg⁺

The number of d -electrons in Fe²⁺ (atomic number  Z = 26)  is different from the number of:
1. s-electrons in Mg (Z = 12)
2. p-electrons in Cl (Z = 17)
3. d-electrons in Fe (Z = 26)
4. p-electrons in Ne (Z = 10)

The correct order of ionic radii is:
1. $H^{-}>H^{+}>H$ $$
2. $N{a}^{+}>F^{-}>O^{2-}$
3. $F^{-}>O^{2-}>N{a}^{+}$
4. $N^{3-}>M{g}^{2+}>A{l}^{3+}$

An element whose IUPAC name is ununtrium (Uut) belongs to:
1. s-block element
2. p-block element
3. d-block element
4. Transition element

If IUPAC name of an element is "unununium" then correct statement regarding element is:
1. It is a inner transition element
2. It belongs to 8th period in periodic table
3. It is transition element
4. It is a non-transition element

Which of the following processes involves absorption of energy?
1. $\mathrm{S}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}\to {\mathrm{S}}^{-}\left(\mathrm{g}\right)$
2. ${\mathrm{S}}^{-}+{\mathrm{e}}^{-}\to {\mathrm{S}}^{2-}\left(\mathrm{g}\right)$
3. $\mathrm{Cl}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}\to {\mathrm{Cl}}^{-}\left(\mathrm{g}\right)$
4. None of these

Which of the following atomic species has maximum ionisation energy?
1. O^-
2. S^-
3. Se^-
4. Te^-

Which is the correct order of ionization energies?