Polarisability and Fajan's Rule

Q.

What is polarizing power and polarizability?

Q. 7. An ionic compound is made up of A and B only ions AOccopy all the corners and alternate edges centres while atoms B occupy all the face center the formula of compound will be

Q. 38. Explain the resonance structure of CO2 molecule.

Q.

$N{a}_{2}C{O}_3$ does not decompose on heating where as $CaC{O}_3$ decomposes. Why?

1. Higher cation charge

2. Presence of Oxygen

3. Lower anion charge

4. Insufficient data

Q. A sample of ammonium phosphate, (NH4)3PO4 contains 18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is

Q. 30. Calcium carbonate reacts with HCl to give CaCl, and CO2 according to the reaction:+ 2HCI(aq) CaCl, (aq) + CO2(g)CaCO3(s)H20(I) What mass of 20% impure CaCO3 isrequired to react completely with 250 mL of 0.50+M HCI?(1) 6.25 g(2) 5 g(3) 4.75 g(4) 7.8 g

Q.

Polarization is the distortion of the shape of an anion by an adjacently placed cation. Which of the following statements is correct

1. Maximum polarization is brought about by a cation of high charge

2. Minimum polarization is brought about by a cation of low radius

3. A large cation is likely to bring about a large degree of polarization

4. A small anion is likely to undergo a large degree of polarization

Q. The decreasing order of solubility of silver halides is:

1. $AgI>AgBr>AgCl>AgF$
2. $AgF>AgCl>AgBr>AgI$
3. $AgCl>AgF>AgBr>AgI$
4. $AgBr>AgF>AgI>AgCl$

Q. which is more stable para hydrogen or ortho hydrogen and why

Q. 17. Number of moles of oxygen atoms present in 360 mg of glucose is

Q.

If the solubility of lithium sodium hexafluoroaluminate, $L{i}_{3}N{a}_3(Al{F}_6{)}_2$ is 's' $mol{L}^{-1}$, its solubility product is equal to -

1. s8

2. 12s3

3. 18s3

4. 2916s8

Q. Knowing that $Na+>M{g}^{2+}$ and $S^{2-}>C{l}^{-}$, predict which compound will be the least soluble in a polar solvent?

1. $MgS$
2. $N{a}_{2}S$
3. $MgC{l}_2$
4. $NaCl$

Q. 81 Why is vinyl free radical more stable Than methyl and phenyl free radical?

Q. The correct order of polarizability is $I^{-},B{r}^{-},C{l}^{-},F^{-}$

1. $I^{-}>B{r}^{-}>C{l}^{-}>F^{-}$
2. $I^{-}>B{r}^{-}=C{l}^{-}>F^{-}$
3. $I^{-}=B{r}^{-}=C{l}^{-}>F^{-}$
4. $I^{-}=B{r}^{-}=F^{-}<C{l}^{-}$

Q.

Which of these pairs of elements would be most likely to form an ionic compound?

1. C and S

2. Cl and Mg

3. Cl and I

4. Al and K

Q. The mass of calcium carbonate required to react completely with 20 ml of 1M HCL as per the reaction CaCO3+2HCl--->CaCl2+CO2 +H2O

Q. Between naphthalene and diphenyl methane, which compound has higher resonance energy

Q. The stability of the following alkali metal chlorides follow the order- A. LiCl>KCl>NaCl>CsCl B. CsCl>KCl>NaCl>LiCl C. NaCl>KCl>LiCl>CsCl D. KCl>CsCl>NaCl>LiCl

Q. 40. The number of molecules in 4.25g of NH3 is approximately?

Q.

What happens if factors in column A are increased?

$\begin{array}{cc}A& B\\ \text{A) Cation size}& I)\text{More Covalent}\\ \text{B) Cation charge}& \text{II) Less ionic}\\ \text{C) Anion Size}& \text{III) More Covalent}\\ \text{D) Anion Charge}& \text{IV) More ionic}\end{array}$

1. C - IV, B - I, A - III or I, D - III or II

2. A - IV, B - II, C - III or I, D - III or I

3. B - IV, C - II, A - III or I, D - III or I

4. D - IV, B - II, C - III or I, A - III or I

Q. What if the radius ratio of an ion is 0.225? Which value of co-ordination no. to be taken? 3 or 4?

Q. A sample of ammonium phosphate (NH)POcontains 3.18 moles of hydrogen atoms. Thenumber of moles of oxygen atoms in the sample is

Q. 35. a) Calcium carbonate reacts with aqueous HCl according to the reaction: }{ CaCO_3(s)+2HCl(aq)→ CaCl_2(aq)+CO_2(g)+H_2O(l)} . What mass of CaCO3 is required to react completely with 25ml of 0.75M HCl } b) }1.0g of a mixture of }CaCO_3 and }MgCO_3 gave }240cm^3 of }CO_2 at STP. Calculate the percentage } composition of the mixture.

Q.

Which compound is highest covalent

1. LiCl

2. LiF

3. LiBr

4. Lil

Q. $AgCl$ is white while $AgI$ is yellow, this is because:

1. $A{g}^{+}$ has 18 electron shell to screen the nuclear charge
2. $A{g}^{+}$ shows pseudo inert gas configuration
3. Distortion of $I^{-}$ is more pronounced than $C{l}^{-}$ ion
4. Distortion of $A{g}^{+}$ ion is more in case of $AgI$

Q. why does thethermal stability of hydrides and fluorides decrease down the group when for other salts it increases in accordance with Fajans rule

Q. Select the correct statement(s).
(i) Polarizability of $S^{2-}$ is lesser than $S{e}^{2-}$
(ii) Polarizability of $S^{2-}$ is higher than $C{l}^{-}$
(iii) polarizability of $S^{2-}$ is lesser than $P^{3-}$
(iv) Polarizability of $O^{2-}$ is higher than $S^{2-}$

1. I, II, and III
2. I and II
3. II and IV
4. None of these

Q. Select the correct statement(s).
$\left(I\right)$ Polarisability of $S^{2-}$ is lower than $S{e}^{2-}$
$\left(II\right)$ Polarisability of $S^{2-}$ is higher than $C{l}^{-}$
$\left(III\right)$ Polarisability of $S^{2-}$ is lower than $P^{3-}$
$\left(IV\right)$ Polarisability of $O^{2-}$ is higher than $S^{2-}$

1. $I,II$ and $III$
2. $I$ and $II$
3. $II$ and $IV$
4. All of these

Q.

The correct order of decreasing polarisability of ion is :

1. 

2. 

3. 

4. 

Q. How to identify polar molecules and non polar molecules?