Colour

Q. What is the common oxidation state of all elements of alkali metals ?

Q. Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

1. The common oxidation states of cerium are +3 and +4
2. Cerium (IV) acts as an oxidizing agent.
3. The +4 oxidation state of cerium is not known in solutions
4. The +3 oxidation state of cerium is more stable than the +4 oxidation state

Q.

Which amongst the following is the least reactive metal ?

1. Gold

2. Magnesium

3. Zinc

4. Copper

Q. (b) Comment on the
(ii) colour of group $17$ elements.

Q.

The elements that gain electrons to form ion are good oxidizing agents.

1. True

2. False

Q. Iron has the lowest oxidation state in

1. $K_4\left[Fe\right(CN{)}_6]$
2. $F{e}_2{O}_3$
3. $\left[Fe\right(CO{)}_5]$
4. $\left[Fe\right(C_2{O}_4{)}_3{]}^{3-}$

Q.

Read the following and select one the correct answer.​​​​​​​

Statement I: $P{b}^{4+}$ compounds are stronger oxidizing agents than $S{n}^{2+}$ compounds

Statement II: The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to inert pair effect.

1. Statement I and Statement II are both correct. Statement II correctly explains Statement I

2. Statement I and Statement II are both correct. Statement II does not explain Statement I

3. Statement II is correct and Statement I is wrong

4. Statement I is correct and Statement II is wrong

Q. Q) How to find Equivalent Weight or Equivalent Volume of CO2 gas?

Q. Which of the following is colourless?

1. $\left[Cu\right(H_{2}O{)}_4{]}^{2+}$
2. $\left[Cu\right(CN{)}_2{]}^{-}$
3. $Cu(N{H}_3{)}_4{]}^{2+}$
4. $[CuC{l}_4{]}^{2-}$

Q. Amongst $Ti{F}_6^{2-},Co{F}_6^{3-},C{u}_{2}C{l}_2$ and $NiC{l}_4^{2-}$ (Atomic number Ti=22, Co=27, Cu=29, Ni=28 The colourless species are

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

Q. Which ion gives coloured solution?

1. $Z{n}^{2+}$
2. $Cu$
3. $T{i}^{4+}$
4. $V^{3+}$

Q.

The magnetic moment of 'autocatalyst' formed in the reaction between acidified oxalic acid and potassium permanganate is

1. 5.9 BM
2. 4.9 BM
3. 3.9 BM
4. 2.8 BM

Q. An ion which imparts lilac colour to the flame and pale yellow colour through blue glass is :

1. sodium
2. chlorine
3. calcium
4. potassium

Q.

Which of these is a polyatomic ion?

${{SO}_4}^{-2}$, ${{NO}_3}^{-1}$, ${{CO}_3}^{-2}$

1. 

2. (NO₃)^-1

3. (CO₃)^-2

4. All of the given options are correct.

Q.

expalin why the solution of alkali metal in liquid ammonia is blue in colour

Q. Although +3 is the characteristic oxidation state for lanthanoids but cerium also shows +4 oxidation state because ___

1. It has variable ionization enthalpy
2. It has a tendency to attain a noble gas configuration
3. It has a tendency to attain $f^0$ configuration
4. It resembles $P{b}^{4+}$

Q. In which case the octet rule is not obeyed ?

1. In the formation $C{a}^{+2}$
2. In the formation of $N{a}^{+}$
3. In the formation $M{g}^{+}$
4. In the formation of $K^{+}$

Q. Which of the following set has all coloured ions

1. $C{u}^{2+},C{o}^{2+},S{c}^{2+}$
2. $C{u}^{+},C{u}^{2+},N{i}^{2+}$
3. $Cu{2}^{+},F{e}^{2+},C{o}^{2+}$
4. $N{a}^{+},M{g}^{2+},A{l}^{3+}$

Q. Which of the following has tendency to act as an oxidizing agent?

1. $C{e}^{4+}$
2. $S{m}^{2+}$
3. $L{u}^{3+}$
4. $G{d}^{3+}$

Q. Which of the following pairs has almost same colour?

1. ${}_{60}N{d}^{3+},{}_{69}T{m}^{3+}$
2. ${}_{70}Y{b}^{3+},{}_{59}P{r}^{3+}$
3. ${}_{63}E{u}^{3+},{}_{67}T{b}^{3+}$
4. ${}_{64}G{d}^{3+},{}_{67}H{o}^{3+}$

Q.

ti3+ salts are coloured. whereas ti4+ salts are white.why?

Q. what is the colour of copper metal

Q. The lines in hydrogen spectrum correspond to the energy levels. What do the fine lines in the spectrum correspond to ?

1. Orbitals
2. Orientation of orbitals
3. Spin of an electron
4. Sub energy levels

Q. The aqueous solution containing which one of the following ions will be colourless

1. 
2. 
3. 
4.