VBT Tetrahedral vs Square Planar

Q.

Why is ${\mathrm{O}}_2$ paramagnetic?

Q.

Why some ions like Zn^+2 Cu^+1 Sc^+3 Ti^+4 are colourless?

Q.

When sodium sulphate solution and barium chloride solution are mixed together, the colour of precipitate formed is:

1. Yellow

2. Green

3. White

4. Red

Q.

Acetic acid was added to a solid X kept in a test tube. A colorless and odorless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that

1. Solid X is sodium hydroxide and the gas evolved is ${\mathrm{CO}}_2$

2. Solid X is sodium bicarbonate and the gas evolved is ${\mathrm{CO}}_2$

3. Solid X is sodium acetate and the gas evolved is ${\mathrm{CO}}_2$

4. Solid X is sodium chloride and the gas evolved is ${\mathrm{CO}}_2$

Q.

Ionisation energy of magnesium is more than that aluminum?

Q.

A square planar complex is formed by hybridization of which of the following atomic orbitals:

1. s, , , ,

2. s, , , ,

3. s, , ,

4. s, , ,

Q.

(a) For the complex $\left[Fe\right(CN{)}_6{]}^{4-}$, write the hybridisation, magnetic character and spin type of the complex. (At. number: Fe=26)
(b) Draw one of the geometrical isomers of the complex $\left[Co\right(en{)}_{2}C{l}_2{]}^{+}$ which is optically active.

Q. Which of the following is planar?

1. 
2. 
3. 
4. 

Q.

Identify X in the following reaction -

${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{OH}\stackrel{\mathrm{Hot}\mathrm{conc}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }\mathrm{X}+{\mathrm{H}}_2\mathrm{O}$

1. Ethane

2. Methane

3. Ethene

4. Ethanol

Q.

Why ${\mathrm{TiCl}}_2$ Is paramagnetic but ${\mathrm{TiO}}_2$ is diamagnetic?

Q.

(a) What happens when a strip of lead metal is placed in a solution of copper chloride? Write the balanced chemical equation for the reaction along with the colour changes observed during the reaction.

(b) What are precipitation reactions? Give one example of precipitation reaction.

Q. Both $\left[Ni\right(CO{)}_4]$ and $\left[Ni\right(CN{)}_4{]}^{2-}$ are diamagnetic. The hybridisations of nickel in these complexes respectively are

1. $s{p}^3,ds{p}^2$
2. $s{p}^3,s{p}^3$
3. $ds{p}^2,s{p}^3$
4. $ds{p}^2,ds{p}^2$

Q.

What do you observe when sodium hydroxide solution is added to zinc sulphate solution in excess?

Q.

Which one of the following has a square planar geometry?

1. $[PtC{l}_4{]}^{2-}$
2. $[CoC{l}_4{]}^{2-}$
3. $[NiC{l}_4{]}^{2-}$
4. $[FeC{l}_4{]}^{2-}$

Q. The ion which is not tetrahedral in shape is?

1. $B{F}_4^{-}$
2. $\left[Cu\right(N{H}_3{)}_4{]}^{2+}$
3. $N{H}_4^{+}$
4. $NiC{l}_4^{2-}$

Q. The shape and total number lone pair of electron present in $Cl{O}_2^{-}$ is

1. bent, 7
2. 7, bent
3. planar , 2
4. tetrahedral, 2

Q.

Which One Of The Following Molecule Is Planar?

1. ${\mathrm{NF}}_3$

2. ${\mathrm{PH}}_3$

3. ${\mathrm{BF}}_3$

4. ${\mathrm{NCl}}_3$

Q.

Rhombic sulphur Consists of:

1. S₄ Rings

2. S₈ Rings

3. S₈Chains

4. S₂ Molecules

Q.

Which of the following process does not occur at the interface of phases?

1. Corrosion

2. Crystallisation

3. Heterogeneous catalysis

4. Homogeneous catalysis

Q.

Among the following compounds the one that is paramagnetic is:

1. ${{\mathrm{O}}_2}^{2-}$

2. ${\mathrm{O}}_3$

3. ${\mathrm{N}}_2\mathrm{O}$

4. ${{\mathrm{O}}_2}^{-}$

Q.

According to CFT, as the ligand approaches towards d orbital it results into

1. No effect

2. Energy remains same

3. Degeneracy is maintained

4. Splitting of d orbital

Q.

Sodium hydroxide solution is added first in small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride and iron (III) sulphate. Copy the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipitate (soluble or insoluble) in (vi) to $\left(x\right)$.

Aqueous salt solution	Colour of precipitate When NaOH is added in a small quantity	Nature of precipitate (soluble or insoluble) when NaOH is added in excess
Copper (II) sulphate	(i)	(vi)
Zinc nitrate	(ii)	(vii)
Lead nitrate	(iii)	(vii)
Calcium chloride	(iv)	(ix)
Iron (III) sulphate	(v)	(x)

Q. Choose the incorrect order of stability :

1. $\left[Cu\right(N{H}_3{)}_4{]}^{2+}<\left[Cu\right(en{)}_2{]}^{2+}<\left[Cu\right(trien){]}^{2+}$
2. $\left[Fe\right(H_{2}O{)}_6{]}^{3+}<\left[Fe\right(N{O}_2{)}_6{]}^{3-}<\left[Fe\right(N{H}_3{)}_6{]}^{3+}$
3. $\left[Fe\right(H_{2}O{)}_6{]}^{2+}<\left[Fe\right(H_2{O}_2{)}_6{]}^{3+}<\left[Co\right(N{H}_3{)}_6{]}^{3+}$
4. $\left[Co\right(H_{2}O{)}_6{]}^{3+}<\left[Rh\right(H_{2}O{)}_6{]}^{2+}<\left[Ir\right(H_{2}O{)}_6{]}^{3+}$

Q. With the help of Valence Bond Theory(VBT), explain hybridisation, geometry and magnetic property of $[NiC{l}_4{]}^{2-}$.

Q.

(c) Write the balanced equation for the following chemical reaction:

Barium chloride + Aluminium sulphate$\to$Barium sulphate + Aluminium chloride

Q. $NiC{l}_2+KCN\left(excess\right)\to A\left(cyanocomplex\right)$
$NiC{l}_2+conc.HCl\left(excess\right)\to B\left(Chlorocomplex\right)$
The hybridisation of A and B are:

1. $ds{p}^2,s{p}^3$
2. $ds{p}^2,ds{p}^2$
3. $s{p}^3{d}^2,d^{2}s{p}^3$
4. $s{p}^3,s{p}^3$

Q.

Which of the following process does not occur at the interface of phases?

1. Crystallisation

2. Homogeneous catalysis

3. Heterogeneous catalysis

4. Corrosion

Q.

When lead nitrate reacts with potassium iodide, yellow precipitate of

1. ${\mathrm{PbI}}_2$ is formed.

2. ${\mathrm{KNO}}_3$ is formed.

3. $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$ is formed.

4. ${\mathrm{PbIO}}_3$ is formed.

Q.

Explain the hybridization of the central atom in ${\mathrm{PCl}}_3$.

Q. Which of the following has square planar structure?

1. $[NiC{l}_4{]}^{2\ominus }$
2. $\left[Ni\right(CO{)}_4]$
3. $\left[Cd\right(CN{)}_4{]}^{2\ominus }$
4. $\left[Ni\right(CN{)}_4{]}^{2\ominus }$