19 March - Super Live Session (2024)

19 March - Super Live Session - Structue of Atom & Classification of Elements & PeriodicityContact Number: 9667591930 / 8527521718

1.

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

2.

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

3.

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

4.

The relationship between energy E, of the radiation with
a wavelength 8000 Å and the energy of the radiation with
a wavelength 16000 Å is
1.${\mathrm{E}}_1=6{\mathrm{E}}_2$
2.${\mathrm{E}}_1=2{\mathrm{E}}_2$
3.${\mathrm{E}}_1=4{\mathrm{E}}_2$
4.${\mathrm{E}}_1=1/2{\mathrm{E}}_2$

5.

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.$\frac{3h}{\mathrm{\pi }}$

6.

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.${\mathrm{n}}_6\to {\mathrm{n}}_5$

7.

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.$6\to 4$

8.

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

9.

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

10.

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

11.

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

12.

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

13.

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.$\left[\mathrm{Ar}\right]3d^5,4s^2$

14.

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

15.

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

16.

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.$\frac{2h}{\mathrm{\pi }}$

17.

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

18.

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

19.

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

20.

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

21.

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

22.

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

23.

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

24.

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

25.

26.

The number of d-electrons in Fe²⁺ (Z = 26) is not equal to 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)

27.

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

28.

Which one of the following arrangements does not give the correct picture of the trends indicated against it?
1. F₂> Cl₂> Br₂> I₂ : Oxidising power
2. F<Cl>Br>I: Electron gain enthalpy
3. F₂> Cl₂> Br₂> I₂ : Bond dissociation energy
4. F> Cl> Br> I: Electronegativity

29.

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

30.

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

31.

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

32.

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

33.

Which is the correct order of ionization energies?

(1) F^-> F >Cl^->Cl
(2) F >Cl>Cl^-> F^-
(3) F^->Cl^->Cl> F
(4) F^->Cl^-> F >Cl

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