Magnetic Properties

Q. The magnetic moment of a transition metal ion is found to be 3.87 B.M. It is probably

1. $T{i}^{3+}$
2. $F{e}^{2+}$
3. $C{r}^{3+}$
4. $N{i}^{2+}$

Q.

The spin only magnetic moment of ${\mathrm{Mn}}^{4+}$ is:

1. $3\mathrm{BM}$

2. $5\mathrm{BM}$

3. $4\mathrm{BM}$

4. $6\mathrm{BM}$

Q.

Write the probable colour of the following salts

1. Ferrous salts.
2. Ammonium salts.
3. Cupric salts.
4. Calcium salts.
5. Aluminium salts.

Q. The calculated spin magnetic moment of Fe(II) is

1. 4.90 B.M.
2. 6.90 B.M.
3. 5.91 B.M.
4. 0

Q. Which of the following has magnetic moment of 1.73 B.M. (approx.)?

1. $[CoC{l}_6{]}^{4-}$
2. $\left[Fe\right(CN{)}_6{]}^{3-}$
3. $\left[Cu\right(N{H}_3{)}_4{]}^{2+}$
4. $\left[Ni\right(CO{)}_4]$

Q. Find the number of electrons in nickel atom (Z = 28) which have orbital angular momentum equal to $\frac{h}{\sqrt{2}\pi }$.

निकल परमाणु (Z = 28) में उन इलेक्ट्रॉनों की संख्या ज्ञात कीजिए जिनका कक्षीय कोणीय संवेग $\frac{h}{\sqrt{2}\pi }$ के बराबर होता है।

1. 18
2. 12
3. 10
4. 8

Q. Which one of the following transition metal ion shows magnetic moment 5.92 BM

1. $M{n}^{2+}$
2. $G^{3+}$
3. $T{i}^{3+}$
4. $C{u}^{2+}$

Q. Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)

1. $C{r}^{2+}$
2. $C{o}^{2+}$
3. $N{i}^{2+}$
4. $T{i}^{3+}$

Q. Eka-boron is ___

1. germanium
2. hydrogen
3. gallium
4. scandium

Q.

Which among the following is the correct formula of Glauber's salt?

1. $N{a}_2$${\left(S{O}_4\right)}_2$●9$H_2$O

2. $N{a}_2$S$O_4$●10$H_2$O

3. Na${\left(S{O}_4\right)}_2$●8$H_2$O

4. NaSO●10$H_2$O

Q. Which of the following species (ion) has the spin only magnetic moment value equal to 4.89 BM?

निम्नलिखित में से किस स्पीशीज (आयन) का चक्रण मात्र चुम्बकीय आघूर्ण का मान 4.89 BM है?

1. Fe³⁺
   
2. Cr²⁺
   
3. Co²⁺
   
4. Cu⁺
   

Q. In which states, the compound of vanadium is diamagnetic?

1. V(II)
2. V(III)
3. V(V)
4. V(IV)

Q. Atoms are extremely small and their radii are generally measured in nanometres.

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.

Q. A metal ion with +3 charge has five electrons in the 3d-subshell. The atomic number of the metal is_________.

Q. Magnetic moment 2.83 BM is given by which of the following ions?
(At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

1. $T{i}^{3+}$
2. $N{i}^{2+}$
3. $C{r}^{3+}$
4. $M{n}^{2+}$

Q. Assertion :$BeC{l}_2$ can not be easily hydrolysed. Reason: $BeC{l}_2$ is electron deficient compound.

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. The assertion is incorrect but Reason is correct
4. Both Assertion and Reason are incorrect

Q. How would you separate $ZnC{O}_3$ from a mixture of $ZnC{O}_3$ and $N{a}_{2}C{O}_3$?

1. distillation
2. filtration
3. chromatography
4. none of these

Q. Which of the following arrangements does not represent the correct order of the property stated against it?

1. Sc ‹Ti ‹Cr ‹Mn : number of oxidation states
2. V²⁺ ‹Cr²⁺ ‹Mn²⁺ ‹Fe²⁺: paramagnetic behavior
3. Ni²⁺ ‹ Co²⁺ ‹ Fe²⁺ ‹ Mn²⁺: ionic size
4. Co³⁺ ‹Fe³⁺ ‹ Cr3⁺ ‹ Sc³⁺: stability in aqueous solution.

Q. if mixed, iron and sulphur form a mixture, but heated form a compound. how are the mixture and compound so formed, identified?

Q. $F{e}^{2+}$ shows

1. Ferromagnetism
2. Paramagnetism
3. Diamagnetism
4. None

Q. Match the column:
$\begin{array}{cccc}& & & \\ & Column-I& & Column-II\\ \left(a\right)& Ni& \left(p\right)& Elementshavingsamenumberofunpairedelectron\\ & & & intheirdipositiveincolumn-I\\ \left(b\right)& K& \left(q\right)& Atleast13electronsarehaving\\ & & & magneticquantumnumber{}^{\prime }zer{o}^{\prime }.\\ \left(c\right)& Mn& \left(r\right)& Atomisparamagnetic\\ \left(d\right)& Pd& \left(s\right)& Elementisnottransitionelemeent\\ & & \left(t\right)& Elementhavingpseudoinertgas\\ & & & configurationinitsdipositivecation\end{array}$

1. (a) p, q, s; (b) r, s; (c) q, r; (d) p, q
2. (a) p, q; (b) r, s; (c) q, r; (d) p, q, s
3. (a) p, q, s; (b) q, r; (c) q, r, s; (d) p, q
4. (a) p, q, s; (b) r, s; (c) p, q; (d) q, r

Q. The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all :

1. halogens
2. noble metals
3. noble gases
4. light metals

Q. The colour of Cu(I) salts is

1. Blue
2. Green
3. White
4. Bluish Green

Q. Which of the following is paramagnetic as well as coloured?

1. $S{c}^{3+}$
2. $T{i}^{4+}$
3. $C{u}^{2+}$
4. $C{u}^{+}$

Q. Atomic number of Cr and Fe are 24 and 26 respectively. Which of the following is paramagnetic with the spin of electron?

1. 
2. 
3. 
4. 

Q. Choose correct option:-
1. Zinc forms colored ions
2. $[Co{F}_6{]}^{3-}$ is paramagnetic
3.Sc forms +4 oxidation state
4. Zinc is not a transition element

1. 1 and 2
2. 1 and 3
3. 2 and 4
4. 3 and 4

Q. Which ion has maximum magnetic moment?

1. 
2. 
3. 
4. 

Q. The aqueous solution of the salt will be colored in the case of:

1. $Zn(N{O}_3{)}_2$
2. $LiN{O}_3$
3. $Co(N{O}_3{)}_2$
4. $CrC{l}_3$