Electronic Configuration and Oxidation States

Q.

Write the electronic configuration and valency of $1$ to $30$ elements.

Q. Amongst the following, the number of oxide(s) which are paramagnetic in nature is
$N{a}_{2}O,K{O}_2,N{O}_2,N_{2}O,Cl{O}_2,NO,S{O}_2,C{l}_{2}O$

Q. Number of paramagnetic oxides among the following given oxides is ____

$L{i}_{2}O,CaO,N{a}_2{O}_2,K{O}_2,MgO\text{and}{K}_{2}O$

1. 3
2. 2
3. 1
4. 0

Q.

Why is Nitrogen an Inert gas?

Q.

What is the oxidation number of N in ${\mathrm{NaNO}}_3$?

Q.

What is the oxidation state of chlorine in bleaching powder?

Q.

What is a diamagnetic ion ?

Q.

What is the oxidation number of $\mathrm{S}$in the ion ${\mathrm{S}}_2{{\mathrm{O}}_3}^{2-}$?

Q.

Which element of group $13$ shows anomalous behavior?

Q. Assertion: Potassium ferrocyanide is diamagnetic whereas potassium ferricyanide is paramagnetic.
Reason: Crystal field splitting in ferrocyanide ion is greater than that of ferricyanide ion.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Which of the following statements is/are true?

1. Among the group 15 elements, Nitrogen has the lowest tendency for catenation
2. Among the group 15 elements, Phosphorus has the highest tendency for catenation
3. Both Nitrogen and Phosphorus do not exhibit catenation at all
4. Both Nitrogen and Phosphorus have very similar trends in terms of ability of catenate

Q. The oxidation number of O in potassium superoxide is

1. -1
2. 
3. 
4. -2

Q. Which of the following species has the electronic configuration $\left[Ar\right]3d^5$?

1. $Cr$
2. $F{e}^{3+}$
3. $Mn$
4. $V$

Q. If the electrons in chromium $\left(Cr\right)$ have $m_l=+1$ and $m_s=-\frac{1}{2}$, then:

1. The minimum number of such electrons is 3
2. The minimum number of such electrons is 2
3. The maximum number of such electrons is 3
4. The maximum number of such electrons is 4

Q. Which oxide of nitrogen is obtained on heating ammonium nitrate at ${250}^{\circ }$ C?

1. 
2. NO
3. 
4. 

Q. Assertion: Both rhombic and monoclinic sulphur exist as $S_8$ but oxygen exists as $O_2.$

Reason: Oxygen form $p\pi -p\pi$ multiple bond due to small size and small bond length but $p\pi -p\pi$ bonding is not possible in sulphur due to its larger atomic size than oxygen.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. The number of unpaired electrons in $F{e}^{2+}$ are :

1. 4
2. 5
3. 3
4. 6

Q.

Nitrogen has the electronic configuration $1s^2,2s^{2}2p_x^{1}2p_y^{1}2p_z^1$ and not $1s^2,2s^{2}2p_x^{2}2p_y^{1}2p_z^0$ which is determined by

1. Pauli's exclusion principle

2. Hund's rule

3. Uncertainty principle

4. Aufbau's principle

Q.

Can chromium be magnetized?

Q. $\left[NiC{l}_2\right\{P\left(C_2{H}_5{)}_2\right(C_6{H}_5){\}}_2]$ exhibits temperature dependent magnetic behavior (paramagnetic/diamagnetic). The coordination geometries of $N{i}^{2+}$ in the paramagnetic and diamagnetic states are respectively:

1. Tetrahedral and tetrahedral
2. Square planar and square planar
3. Tetrahedral and square planar
4. Square planar and tetrahedral

Q. How many unpaired electrons are present in ${Ni}^{2+}$?

1. $0$
2. $2$
3. $4$
4. None of the above

Q. The bond order of $CO\text{and}NO\text{is}$:

1. 3 and 2
2. 3 and 2.5
3. 3 and 1.3
4. 3 and 3.5

Q. Which of the following substance if kept in magnetic field, is thrown out of the magnetic field?

1. Paramagnetic
2. Ferromagnetic
3. Diamagnetic
4. Antiferromagnetic

Q. what happens when these nitrates reacts with KCN -Cu(NO3)2 AgNO3 Cd(NO3)2 Pb(NO3)2

Q. What is the oxidation number of sulfur in H2S?

1. -2
2. -1
3. 1
4. 2

Q. The oxidation states of nitrogen in $N{H}_{4}N{O}_3$ are :

1. -3 , + 5
2. -4, + 5
3. + 3, + 5
4. +3 , -5

Q.

Draw the electronic distribution for sodium (

Q. If 1gram of copper on oxidation gives 1.252grams of copper oxide. Find the formula of copper oxide.

Q. Which one of the following sets of quantum numbers represents the highest energy level in an atom?

1. $n=4,l=0,m=0,s=+1/2$
2. $n=3,l=1,m=1,s=+1/2$
3. $n=3,l=2,m=-2,s=+1/2$
4. $n=3,l=0,m=0,s=+1/2$

Q. Nitrogen exist as a _____________ at room temperature.

1. Monoatomic gas
2. Diatomic gas
3. Triatomic gas
4. None of the options are corect