Introduction to d and f Block Elements

Q.

The ground state electronic configuration of chromium atom is:

1. 

2. 

3. 

4. 

Q. Q. The density of mercury is 13.6 g/mL. The diameter of an atom of mercury assuming that each atom is occupying a cube of edge length equal to the diameter of the mercury atom is approximately (in Angstrom): (a) 3.01 (b) 2.54 (c) 0.29 (d) 2.91

Q. 20. Gold crystallises in an fcc lattice. If the edge length of unit cell of gold is 350 pm, the radius of gold atom will be

Q.

In which set of molecules all species are paramagnetic

1. B₂, O₂, N₂

2. B₂, O₂, NO

3. B₂, F₂, O₂

4. B₂, O₂, Li₂

Q. in ab3 anions b are present in ccp structure and cation a is present in octahedral void the percentage of octahedral void occupied is a. 25% b. 33% c. 50% d. 67

Q. Why does NH3 have a higher dipole moment than H2S?

Q. 2 If edge length of NaH unit cell is 488 pm, what is the length of Na--H bond if it crystallises in fcc structure (1)488 pm (2)122 pm (3)244 pm (4) 976 pm

Q. 41.What is redistribution of electron

Q. The general electronic configuration of d-block elements is
[ Noble gas] $(n-1)d^{1-10}n{s}^{1-2}$ .

1. False
2. True

Q. in which of the following crystal st all the tetrahedral voids are vacant 1 caf2 2 na2o 3zns 4nacl

Q. 30. Silver has a density of g/cm^3 the number of silver atoms on a surface of area 10^{-22} meter^2 can be expressed in scientific notation

Q. 20. which of following have almost equal spin only and observed magnetic moment a)Fe(II) b)Ni(II) c)Cu(II) d)V(II)

Q. 4.If in a crystal structure Y constitutes ccp unit cell with Y again occupying 1/2 of the tetrahedral voids, then find approximate packing fraction of the solid.

Q. radiusWhat is the value of electron gain enthalpy of Na ifIE, of Na 5.1 eV?(1) +2.55 eV(3) -5.1 eV\lbrack AIPMT (Mains) -2011\rbrack(2) +10.2 eV(4) -10.2 eVt ordor.

Q. Is C2H6 paramagnetic

Q. why deuterium mostly in the form of H

Q. why 1s electron level allaws hydrogen to absorb a photon but not emit a photon?

Q. IS THE white phosphorus is a monomer of p4 or a polymer of p4

Q. An electron is revolving around the nucleus of He+ ion speed 2.188 ×10⁶ m/s.What is the P.E of Electron?

Q. Which of the following are d-block elements?

1. Sodium
2. Zinc
3. Titanium
4. Argon

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Three elements $X,Y$ and $Z$ are in the $3^{rd}$ period of the periodic table. The oxides of $X,Y$ and $Z$, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of $X,Y$ and $Z$ is :

JEE MAIN - 2020

1. $X<Y<Z$
2. $Y<X<Z$
3. $Z<Y<X$
4. $X<Z<Y$

Q.

1. Para, para

2. Dia, para

3. Dia , dia

4. Para, dia

Q. 8. in which of the following defects, the stoichiometry of the crystal is disturbed? a)Metal excess defect b)Impurity defect c)Schottky defect d)Both (1) & (2)

Q. TOTAL NO OF UNPAIRED ELECTRONES IN NO2 ? A.1 B.2 C.3 D.4

Q. 23. If in a crystal structure Y constitutes ccp unit cell with Y again occupying 1/2 of the tetrahedral voids, then find approximate packing fraction of the solid.

Q. how many molucle of Na in NaCl compound?

Q. in the ground state an element has 13 electrons in its M-shell. the element i

Q. correct order of unpaired electron in O_2^{2+}, O_2^{-2}, O_2^{+1}, O_2^{-1}, O_{

Q. the number of electrons in H^{2^+}, H_2 , and {O^+}_2 ?

Q. The number of completely filled shells for the element 16S32 is [2017] (A) 1 (B) 2 (C) 3 (D) 4