Group 1 Elements

Q. For electrolysis of aqueous $ZnS{O}_4$ solution using $Zn$ electrodes, which of the following is true:

1. $Zn$ get dissolved at positive terminal electrode
2. $Zn$ get dissolved at negative terminal electrode
3. $Zn$ get deposited on positive terminal electrode
4. All of the above

Q. 66. The order of stability of metal oxides in the increasing order Al2O3, MgO, Fe2O3, Cr2O3

Q. On electrolysis of aqueous $CuS{O}_4$ with $Cu$ electrodes, the reduced $Cu$ gets deposited on:

1. sides of the container
2. half of positive terminal and half of negative terminal electrodes
3. negative terminal electrode
4. positive terminal electrode

Q. Sodium ordinarily does not show an oxidation state of +2, because of its

1. High first ionization potential
2. High second ionization potential
3. Large ionic radius
4. High electronegativity

Q. $1000mL$ of $1MCuS{O}_4\left(aq\right)$ is electrolysed by $9.65$ ampere current for $100s$ using $Pt-$ electrode. Which of the following statement is correct?
[ Equivalent weight of $O_2$ is 8 g]

1. Blue colour intensity of solution decreases during electrolysis
2. Blue colour intensity of solution increases during electrolysis
3. Blue colour intensity of solution remains constant during electrolysis
4. Blue colour intensity of solution remains increases if copper electrode is used

Q. 16. The order of stability of metal oxides is Cr2O3 MgO Al2O3 Fe2O3

Q. For the electrolysis of molten $NaCl$ using inert platinum electrodes, choose the correct option(s).

1. Reaction at anode :
   $N{a}^{+}\left(l\right)+e^{-}\rightleftharpoons Na\left(s\right)$
2. Reaction at cathode :
   $N{a}^{+}\left(l\right)+e^{-}\rightleftharpoons Na\left(s\right)$
3. Chlorine gas is produced at anode
4. Chlorine gas is producedat cathode

Q. The first three elements of Group I have the following atomic structures
a) Lithium : 3 protons , 4 neutrons; 2, 1 electrons
b) Sodium : 11 protons, 12 neutrons ; 2, 8, 1 electrons
c) Potassium : 19 protons, 20 neutrons; 2, 8, 8, 1 electrons
Which of the following features causes them to have similar properties ?

1. The same number of protons
2. One electron in the outermost shell
3. More protons than electrons
4. Two electrons in the first shell

Q. Which of the following statements are true?

1. Only type of interactions between particles of noble gases are due to weak dispersion forces.
2. Ionization enthalpy of molecular oxygen is very close to that of xenon.
3. Xenon fluorides are not reactive.
4. Hydrolysis of $Xe{F}_6$ is a redox reaction.

Q. Which one of the following electrolytes is used in Down's process of extracting sodium metal?

1. $NaCl+KCl+KF$
2. $N{a}_{2}C{O}_3$
3. $NaOH$
4. $NaHC{O}_3$

Q.

$\mathrm{NaCl}$ molecule is made of which of the following ions?

1. ${\mathrm{Na}}^{+}$ and ${\mathrm{Cl}}^{-}$

2. ${\mathrm{Na}}^{-}$and ${\mathrm{Cl}}^{+}$

3. ${\mathrm{Na}}^{-}$ and ${\mathrm{C}}^{+}$

4. ${\mathrm{Na}}^{+}$ and ${\mathrm{C}}^{-}$

Q. Which of the following is true regarding oxides and hydroxides of alkali metals?

1. As the size of metal ion increases, the stability of peroxide or superoxide decreases.
2. As the size of metal ion increases, the stability of peroxide or superoxide increases.
3. As the size of metal ion increases, the stability of peroxide or superoxide remains the same.
4. None of the above

Q. Which of the following is true regarding oxides and hydroxides of alkali metals?

1. As the size of metal ion increases, the stability of peroxide or superoxide decreases.
2. As the size of metal ion increases, the stability of peroxide or superoxide increases.
3. As the size of metal ion increases, the stability of peroxide or superoxide remains the same.
4. None of the above

Q. Which of the following is true for mercury cell?

1. Products of the electrode reactions are separated by thin membrane
2. Paste of $HgO$ and carbon will act as anode
3. Zinc – mercury amalgam will act as cathode
4. All of the above.

Q.

The Down’s process is used for the extraction of which alkali metal?

1. Li

2. Na

3. K

4. None of the Above

Q. Which of the following statements are true?

1. Only type of interactions between particles of noble gases are due to weak dispersion forces.
2. Xenon fluorides are not reactive.
3. Ionization enthalpy of molecular oxygen is very close to that of xenon.
4. Hydrolysis of $Xe{F}_6$ is a redox reaction.

Q. For electrolysis of aqueous $ZnS{O}_4$ solution using $Zn$ electrodes, which of the following is/are true:

1. $Zn$ get dissolved at positive terminal electrode
2. $Zn$ get dissolved at negative terminal electrode
3. $Zn$ get deposited on negative terminal electrode
4. $Zn$ get deposited on positive terminal electrode

Q. Select the correct statement for electrolysis of $A{l}_2{O}_3$ by Hall-Heroult process.

1. Cryolite $N{a}_3\left[Al{F}_6\right]$ lowers the melting point of $A{l}_2{O}_3$ and increases its electrical conductivity.
2. Al is obtained at cathode and probably $C{O}_2$ at anode.
3. Both of the above statements are correct.
4. None of the above statements are correct.

Q. Explain briefly the extraction of aluminium from bauxite.

Q. Which of the following statements is incorrect ?

1. $L{i}^{+}$ has minimum degree of hydration
2. $MgS{O}_4$ is readily soluble in water
3. $Na$ is used to make a $Na/Pb$ alloy
4. The oxidation state of $K$ in $K{O}_2$ is +1

Q. For the electrolysis of molten $NaCl$ using inert platinum electrodes, choose the correct option.

1. Reaction at anode :
   $N{a}^{+}\left(l\right)+e^{-}\rightleftharpoons Na\left(s\right)$
2. Reaction at cathode :
   $N{a}^{+}\left(l\right)+e^{-}\rightleftharpoons Na\left(s\right)$
3. Chlorine gas is produced at cathode
4. All of the above.

Q. The correct sequence of groups in assigning R, S configuration in the above-given figure is:

1. $N{H}_2>C{H}_3>COOH>H$
2. $N{H}_2>COOH>C{H}_3>H$
3. $COOH>N{H}_2>C{H}_3>H$
4. $C{H}_3>N{H}_2>COOH>H$

Q. Assertion :Elemental sodium is a good reducing agent Reason: An atom of elemental sodium gives up its valence electron readily

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

Q. The major role of fluorspar which is added in small amount in the electrolytic reduction of $A{l}_2{O}_3$ dissolved in fused cryolite is :

1. as a catalyst
2. to make the fused mixture very conducting
3. to decreases the rate of oxidation of carbon at the anode
4. to lower the temperature of melting

Q. During electrolytic reduction of alumina, two auxiliary electrolytes X and Y are added to increase the electrical conductance and lower the temperature of melt in order to make fused mixture very conducting. X and Y are :

1. cryolite and flourspar
2. cryolite and alum
3. alum and flourspar
4. flourspar and bauxite

Q. The product obtained at anode when $50\%H_{2}S{O}_4$ aqueous solution is electrolysed using platinum electrodes is :

1. $H_{2}S{O}_3$
2. $O_2$
3. $H_2$
4. $H_2{S}_2{O}_8$

Q. Which one of the following electrolytes is used in Down's process of extracting sodium metal?

1. $NaCl+KCl+KF$
2. $N{a}_{2}C{O}_3$
3. $NaOH$
4. $NaHC{O}_3$

Q. On electrolysis of a solution of dilute $H_{2}S{O}_4$ between platinum electrodes, the gas evolved at the anode is:

1. $S{O}_2$
2. $S{O}_3$
3. $O_2$
4. $H_2$

Q. Electrolysis of which of the following electrolytes does not liberate oxygen at anode?

1. Dilute $H_{2}S{O}_4$ with platinum electrodes
2. Dilute $H_{2}S{O}_4$ with copper electrodes
3. Saturated solution of potassium chloride with $Pt$ electrodes
4. Aqueous solution of $AgN{O}_3$ using $Pt$ electrodes

Q. With reference only to the periodic table, indicate which of the atoms Bi, S, Ba, As and Ca is most metallic?

1. Ba
2. Bi
3. S
4. Ca