Reactivity of Actinides

Q.

Name the twelve elements of nature.

Q. The incorrect statement among the following is :

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1. Actinoid contraction is greater for element than Lanthanoid contraction.
2. Lanthanoids are good conductors of heat and electricity.
3. Most of the trivalent Lanthanoid ions are colourless in the solid state.
4. Actinoid are highly reactive metals, especially when finely divided.

Q. The maximum number of electrons in a sub shell is given by ?

Q. the order of E2 elimination for alkyl halides is what? among 1^° , 2^° and 3 .compare it with E1 too.

Q.

How many Actinides are Found in Nature?

Q. What is difference between alkyl and aryl halides

Q. Which of the following configuration follows Hund's rule:

1. 
2. 
3. 
4. 

Q.

Which of the following is not the condition for the complex formation?

1. Smaller size of transition metal ion.

2. Absence of vacant d-orbitals

3. Availability of vacant d-orbitals.

4. High ionic charge density on metal ion.

Q. the energy gap between the two sets of orbital is small enough to prevent electron enetring 3d orbital. What does the above statement mean

Q.

Give any two differences between lanthanoids and actinoids.

Q.

The elements which lie between s and p block elements in the long form periodic table are called as:

1. Electropositive elements

2. d-block elements

3. Lanthanides

4. Actinides

Q. Rare earths are generally

1. Lanthanides
2. f – block elements
3. Actinides
4. Inner transition elements

Q.

Which elements in the second period will have the lowest and highest ionization energies? Explain.

Q.

The noble gas that was discovered first on sun and then on earth is:

1. Neon

2. Argon

3. Xenon

4. Helium

Q. Actinides have higher tendency to form complexes than Lanthanides, due to

1. Higher charge and smaller size
2. Smaller charge and larger size
3. They are radioactive
4. They are electropositive

Q.

Which of the following group contain mostly radioactive elements ?

1. 3 d transition series

2. 4 d transition series

3. Actinoids

4. Lanthanoids

Q. Write the uses of actinides.

Q. Select incorrect statement.

1. Ionisation energies of 5d-elements are greater than those of 3d and 4d elements.
2. Cu(I) is diamagnetic while Cu(II) is paramagnetic.
3. $\left[Ti\right(H_{2}O{)}_6{]}^{3+}$ is coloured while $\left[Sc\right(H_{2}O{)}_6{]}^{3+}$ colourless.
4. Transition elements cannot form complexes.

Q. Write quantum numbers for valance shell of chromium

Q. Lanthanide and actinides resemble in:

1. electronic configuration
2. oxidation state
3. ionisation energy
4. formation of complexes

Q. While making a hybrid orbitals and moving electrons to d subshell why we take first dz2 and then dx2 - y2 whereas in p subshell we can take any orbital

Q.

Which of the following are all radio active elements?

1. Transition elements
2. P block elements
3. Lathanides
4. Actinides

Q. The incorrect statement among the following is :

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1. Lanthanoids are good conductors of heat and electricity.
2. Actinoid are highly reactive metals, especially when finely divided.
3. Actinoid contraction is greater for element than Lanthanoid contraction.
4. Most of the trivalent Lanthanoid ions are colourless in the solid state.

Q. What does it mean by maximum multiplicity in hunds rule

Q. Q. Which of the following shows biggest jump in II and III ionization energy :
a)1s^2, 2s^2, 2p^6, 3s^2
b)1s^2, 2s^2, 2p^6, 3s^2, 3p^2
c)1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 4p^2
d)1s^2, 2s^2

Doubt : After removal of two electrons, option 'a' has the electonic configuration of Neon and option 'd' has the electronic configuration of Helium. Now how to choose between the two options ? Please explain.


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Q. Write one similarity and one difference between the chemistry of lanthanoids and that of actinoids.

Q. _________ form oxocations.

1. Lanthanides
2. Actinides
3. Alkali metals
4. Noble gas

Q.

Which of the following is natural element?

1. Pm
2. La
3. Pu
4. Np

Q. Uranium react with $conc.HN{O}_3$;

1. to give $U(N{O}_3{)}_2$ and $N{O}_2$
2. $U{O}_2(N{O}_3{)}_2$ and $H_2$
3. to make metal passive
4. to give $U(N{O}_3{)}_4$ and $H_2$

Q.

The color of sulphur is:

1. Black

2. Grey

3. Yellow

4. Green