Introduction to d and f Block Elements

Q.

Please tell me a trick to memorize the elements in the periodic table.....!!!!!

Q.

The most reactive metal is _____.

1. Sodium

2. Magnesium

3. Potassium

4. Calcium

Q. nt2.56g sulphur in 100g CS2 has depression in freezing point of 0.010, Kf=0.1. hence atomicity of sulphur in the solution isn

Q.

The 3d transition series starts from which atomic number?

Q. Which of the following do not form hydrides?

1. $Fe$
2. $Co$
3. $Ni$
4. $Pd$

Q.

What are the characteristics of the transition elements and why are they called transition elements? Which of the d-block elements may not be regarded as the transition elements?

Q. A compound XY crystallizes in BCC lattice with unit cell -edge length of 480 pm, if the radius of anion is 225 pm, then the radius of cation is

Q.

Which of the following element does not belong to Actinoids series?

1. Uranium

2. Thorium

3. Plutonium

4. Holmium

Q. Which one of the following is a mineral of iron ?

1. Malachite
2. Pyrolusite
3. Magnetite
4. Cassiterite

Q.

Name an ore of mercury and write its formula.

Q. The spin-only magnetic moment value of an octahedral complex among $CoC{l}_3.4N{H}_3,NiC{l}_2.6H_{2}O$ and $PtC{l}_4.2HCl$, which upon reaction with excess of $AgN{O}_3$ gives 2 moles of $AgCl$ is B.M. (Nearest Integer)

Q. Which of the following 3d-metal ion will give the lowest enthalpy of hydration $\left({\Delta }_{\text{hyd}}\text{H}\right)$ when dissolved in water ?

1. ${\text{Mn}}^{2+}$
2. ${\text{Fe}}^{2+}$
3. ${\text{Cr}}^{2+}$
4. ${\text{Co}}^{2+}$

Q.

Zinc oxide is said to have amphoteric nature, but Sodium oxide is not. Explain.

Q. In which of the following species, the colour is due to charge transfer?
$\left(I\right)C{r}_2{O}_7^{2-}\left(II\right)Mn{O}_4^{2-}\left(III\right)Cr{O}_4^{2-}\left(IV\right)Mn{O}_4^{-}$

1. I, II, III correct
2. II, IV correct
3. I, III correct
4. I, II, III, IV correct

Q.

What are transition metals used for in everyday life?

Q.

Classify the following change as physical or chemical:

Magnetizing a piece of iron.

Q. 32.Why hydroxide of lanthanoid are less basic than actinides ??

Q.

The silver salts like $\mathrm{AgBr}$ and $\mathrm{AgI}$ are colored because of

1. d-d transition of electrons

2. charge transfer

3. both A and B

4. Polarisation of halid ${\mathrm{Ag}}^{+}$

Q.

Give the reason why the magnetization of iron is a physical change while rusting of iron is a chemical change.

Q.

5) Classify the following changes as physical and chemical change

f) Magnetization of iron

Q. 77 If the vant Hoff factor and degree of dissociation of Al2(SO4)3 are i and alpha then show that i=1+4alpha.

Q.

Which state is the largest producer of manganese in India?

Q. what is the work of reagent DIBAL-H and on which type of compounds does it works

Q.

Define electropositivity?

Q.

Which form of silver is colourless?

Q. Which of the following complex compound is low spin, inner orbital, diamagnetic complex? (a) \lbrack Ni(NH_3)_6\rbrack Cl_{2 } (b) K_3\lbrack Fe(CN)_6\rbrack (c) K_2\lbrack PtCl_6\rbrack (d) \lbrack Cr(H_2O)_6\rbrack Cl_{

Q. The name rare earths is used for

1. lanthanides only

2. actinides only

3. both lanthanides and actinides

4. alkaline earth metals

Q. The ionic radii of $R{b}^{+}and{I}^{-}$ are 1.46 $\stackrel{\circ }{A}$ and 2.16$\stackrel{\circ }{A}$. the most probable type of structure exhibited by it is

1. ZnS type
2. NaCl type
3. CsCl type
4. CaF₂ type

Q.

Is Germanium radioactive

Q. Among the four resonating structures of anthracene, what is the stability order?