Magnetic Properties

Q.

Assuming 2s - 2p mixing is not operative the paramagnetic species among the following is:

1. 

2. 

3. 

4. 

Q. 43 The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is (1)2 (2)3 (3)4 (4)1

Q. 59. Clo2 is paramagnetic. How??

Q. Chloro compound of Vanadium has only spin magnetic moment of 1.73 BM. This Vanadium chloride has the formula: (at. no. of V = 23)

1. $VC{l}_4$
2. $VC{l}_3$
3. $VC{l}_2$
4. $VC{l}_5$

Q.

The elements beyond atomic number (Z = 92) are known as:

1. oxygen family

2. trans fermium elements

3. carbon family

4. Transuranium elements

Q. 46. Why ferromagnetic substance doesnt lose magnetism in absence of an magnetic field like paramagnetic substances

Q. The characteristic properties of transition elements are due to

1. presence of 2 modal planes for d – orbital
2. unpaired electrons in d-sub shell
3. d – orbitals have five fold degeneracy
4. because they belong to d – block

Q.

The alkaline earth metal that forms mainly covalent compounds is

1. Ca

2. Mg

3. Be

4. Ba

Q. Consider the four sulphates: $FeS{O}_4,MnS{O}_4,CoS{O}_4$ and $ZnS{O}_4$. Four separate capsules of these materials have been made containing $0.1$ mole of the substance and are suspended by a thread. A strong magnet is brought close to each capsule. The order of sulphates according to the strength of the response towards the magnet is:

1. $MnS{O}_4>FeS{O}_4>CoS{O}_4>ZnS{O}_4$
2. $FeS{O}_4>MnS{O}_4>CoS{O}_4>ZnS{O}_4$
3. $CoS{O}_4>ZnS{O}_4>FeS{O}_4>MnS{O}_4$
4. $CoS{O}_4>FeS{O}_4>MnS{O}_4>ZnS{O}_4$

Q. Group IA alkali metals form covalent hydrides - true or false?

1. True

2. False

Q. The element in which $5f$ orbitals are progressively filled are known as

1. Actinides
2. Transition elements
3. Representative elements
4. Lanthanides

Q. In H-atom for n=2, how many degenerate orbitals are there

Q. 24. number quantum magnetic is What

Q. the edge length of fcc is 508 pm if radius of cation is 110 pm find radius of anion

Q. given 3 moles of C2H6 find 1. no. of moles of carbonatoms 2.no. of moles of hydrogen atoms 3. no. of molecules of C2H6

Q. 4. how to identify hybridisation if central atom has lone pairs?

Q. Which of the following substances will make a better permanent magnet?

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

Q. Select the correct statement(s).

सही कथन/कथनों का चयन कीजिए।

1. At the node, the value of radial wave function always changes from positive to negative
   
   नोड पर, त्रिज्य तरंग फलन का मान सदैव धनात्मक से ऋणात्मक में परिवर्तित हो जाता है
2. Only three quantum numbers n, l and m are needed to define an orbital
   
   एक कक्षक को परिभाषित करने के लिए केवल तीन क्वाण्टम संख्याओं n, l तथा m की आवश्यकता होती है
3. An electron near the nucleus is repelled by the nucleus and has a low potential energy
   नाभिक के समीप स्थित इलेक्ट्रॉन नाभिक द्वारा प्रतिकर्षित होता है तथा इसकी स्थितिज ऊर्जा कम होती है
4. The radial function depends on the quantum numbers n and l
   
   त्रिज्य फलन क्वाण्टम संख्याओं n तथा l पर निर्भर करता है

Q. which of the following would have a permanent dipole moment? BF3 SiF4 SF4 XeF4

Q. Which of the following is natural element?

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

Q. There is loss in weight when mixture of $L{i}_{2}C{O}_3$ and $N{a}_{2}C{O}_3\cdot 10H_{2}O$ is heated strongly. This loss is due to:

1. $L{i}_{2}C{O}_3$
2. $N{a}_{2}C{O}_3\cdot 10H_{2}O$
3. both (a) and (b)
4. none of these

Q. 27. The number of occupied orbital with magnetic quantum number equal to zero in Ca and N respectively are

Q.

The main axis of a diatomic molecule is z, molecular orbital p_{x }and p_x overlap to form which of the following orbitals

1) π molecular orbital 2) σ molecular orbital 3 No bond will form

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. An element with atomic number 34 belongs to 1) s-block 2) p-block 3) d-block 4) f-block

Q. The colour of Cu(I) salts is

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

Q. In H-atom for n=2, how many degenerate orbitals are there

Q. Statement 1: The number of unpaired electrons in the following ions:
$M{n}^{2+},C{r}^{3+},V^{3+}$ and $T{i}^{3+}$ are 5, 3, 2 and 1 respectively.
Statement 2: $V^{3+}$ has a magnetic moment $(8{)}^{\frac{1}{2}}BM$

1. Statement 1 is true, statement 2 is true, statement 2 is the correct explanation for statement 1
2. Statement 1 is true, statement 2 is true, statement 2 is not the correct explanation for statement 1
3. Both statements are false
4. Statement 1 is false, statement 2 is true

Q. Match the terms given in $\text{Column}1$ with the units in $\text{Column 2}$.

$\text{Column}1$	$\text{Column 2}$
$\left(p\right)E_{cell}$	$\left(1\right){\text{S cm}}^{-1}$
$\left(q\right)\text{Cell constant}$	$\left(2\right)\text{V}$
$\left(r\right)\text{Conductivity}$	$\left(3\right){\text{m}}^{-1}$
$\left(s\right)\text{molar conductivity}$	$\left(4\right){\text{S cm}{}^2\text{mol}}^{-1}$

1. $(p-2)(q-3)(r-4)(s-1)$
2. $(p-2)(q-1)(r-4)(s-3)$
3. $(p-1)(q-3)(r-2)(s-4)$
4. $(p-2)(q-3)(r-1)(s-4)$

Q. what is the difference between Ferrimagnetic and paramagnetic?