Other Compounds of Phosphorus

Q. Charge required to reduce one mole of $C{r}_2{O}_7^{2-}$ to $C{r}^{3+}$ in an acidic medium is:

1. 3 Faraday
2. 6 Faraday
3. 0.3 Faraday
4. 0.6 Faraday

Q. A metal X on heating in nitrogen gas gives Y. Y on treatment with $H_{2}O$ gives a colourless gas which when passed through $CuS{O}_4$ solution gives a blue colour. Y is

1. $Mg(N{O}_3{)}_2$
2. $M{g}_3{N}_2$
3. $N{H}_3$
4. $MgO$

Q. One mole each of $H_{3}P{O}_2,H_{3}P{O}_3$ and $H_{3}P{O}_4$ will neutralize '$x$' mol of $NaOH,\text{'}y\text{' mol of Ca}{\left(OH\right)}_2$ and $\text{'}z\text{' mol of Al}{\left(OH\right)}_3$ (assuming all to be strong electrolytes) respectively. $x,y$ and $z$ are in the ratio:

1. $3:1.5:1$
2. $1:2:3$
3. $3:2:1$
4. $1:1:1$

Q. In each of the following questions, two statements are given: statement -1 and statement -2. Examine the statements carefully and answer the questions according to the instructions given below:

Statement 1: $H_{3}P{O}_4$ is the most acidic among $H_{3}P{O}_4,H_{3}P{O}_3\text{and}{H}_{3}P{O}_2$.

Statement 2: In general, the acidity of oxyacids increases with the increase in percentage of oxygen.

1. Statement -1 is false, Statement -2 is true.
2. Statement -1 is true, statement -2 is true; statement -2 is the correct explanation for statement -1.
3. Statement -1 is true, statement -2 is true; statement -2 is NOT the correct explanation for statement -1.
4. Statement -1 is true, statement -2 is false.

Q. The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product ‘A’. The reaction of 1 mol of ‘A’ with excess of $AgN{O}_3$ in aqueous medium gives mol(s) of Ag.
(Round off to the Nearest Integer)

Q. Decay of nitrogeneous organic matter will produce _____.

1. $N{H}_3$
2. $NO$
3. $N_2$
4. $N_{2}O$

Q. A metal X on heating in nitrogen gas gives Y. Y on treatment with $H_{2}O$ gives a colourless gas which when passed through $CuS{O}_4$ solution gives a blue colour. Y is

1. $Mg(N{O}_3{)}_2$
2. $M{g}_3{N}_2$
3. $N{H}_3$
4. $MgO$

Q. Arrange the following in decreasing order of their acidic strengths.

1. A > C > B > D
2. A > D > B > C
3. A > D > C > B
4. D > A > C > B

Q. Phosphate rocks - in the form of $C{a}_3(P{O}_4{)}_2$ are soluble in water - True or False?

1. False
2. True

Q. Upon heating with $C{u}_{2}S,$ the reagent(s) that give copper metal is/are
(IIT-JEE, Advanced 2014)

1. $CuFe{S}_2$
2. $C{u}_{2}O$
3. $CuS{O}_4$
4. $CuO$

Q. Consider the following reaction sequence:
Metal (M) $\stackrel{\text{very dil.}HN{O}_3}{\to }$ no reaction
Metal (M) $\stackrel{Conc.HN{O}_3}{\to }$ light blue solution (A) + gas (B)
The incorrect statement(s) is(are) :

1. gas (B) is diamagentic
2. solution (C) contain only $NaN{O}_2$ salt
3. dark blue solution is paramagnetic
4. metal (M) is extracted by thermite process

Q. Choose correct statements:

1. Superphosphate is $Ca{H}_4{P}_2{O}_8$
2. triple superphosphate is $Ca(H_{2}P{O}_4{)}_2$
3. Both (a) and (b) are correct
4. None of the above is coreect

Q. Phosphate rocks - in the form of $C{a}_3(P{O}_4{)}_2$ are soluble in water - True or False?

1. False
2. True

Q. Atomicity of white or yellow phosphorus is 4 and it forms a molecule $-P_4$. Calculate the value of the expression $\frac{x.y}{z}$, where:
$x$: Total number of vertex angles in $P_4$ molecule
$y$: Total number of lone pairs in $P_4$ molecule
$z$: Total number of $P-P$ bonds in $P_4$ molecule

Q. In each of the following questions, two statements are given: statement -1 and statement -2. Examine the statements carefully and answer the questions according to the instructions given below:

Statement 1: $H_{3}P{O}_4$ is the most acidic among $H_{3}P{O}_4,H_{3}P{O}_3\text{and}{H}_{3}P{O}_2$.

Statement 2: In general, the acidity of oxyacids increases with the increase in percentage of oxygen.

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. Statement -1 is true, statement -2 is false.
4. Statement -1 is false, Statement -2 is true.

Q. Element A which belongs to group 12 and period 4 is a bluish white metal. A reacts with conc. $H_{2}S{O}_4$ and gives B with the liberation of $S{O}_2$. With $NaOH$. A gives compound C. Identify A, B and C. Explain the reaction.

Q. What will occur if a block of copper metal is dropped into a beaker containing a solution of 1M $ZnS{O}_4$?

1. No reaction will occur
2. The copper metal will dissolve with evolution of oxygen gas
3. The copper metal will dissolve with evolution of hydrogen gas
4. The copper metal will dissolve and zinc metal will be deposited

Q. Which of the following is the composition of the yellow precipitate obtained in the test for phosphates using ammonium molybdate?

1. $\left(N{H}_4{)}_3\right[PM{o}_{12}{O}_{36}]$
2. $(N{H}_4{)}_{3}P{O}_4.10Mo{O}_3$
3. $(N{H}_4{)}_{3}P{O}_4.14Mo{O}_3$
4. $\left(N{H}_4{)}_3\right[PM{o}_{12}{O}_{40}]$

Q. Upon heating with $C{u}_{2}S,$ the reagent(s) that give copper metal is/are
(IIT-JEE, Advanced 2014)

1. $CuFe{S}_2$
2. $CuO$
3. $C{u}_{2}O$
4. $CuS{O}_4$

Q. Atomicity of white or yellow phosphorus is 4 and it forms a molecule $-P_4$. Calculate the value of the expression $\frac{x.y}{z}$, where:
$x$: Total number of vertex angles in $P_4$ molecule
$y$: Total number of lone pairs in $P_4$ molecule
$z$: Total number of $P-P$ bonds in $P_4$ molecule

Q. The nature of the final solution is :

1. acidic
2. basic
3. neutral
4. None of the above

Q. The volume of $1.5$ M $H_{3}P{O}_4$ solution required to neutralize exactly $90$ mL of a $0.5$ M $Be(OH{)}_2$ solution is:

1. $10$ mL
2. $30$ mL
3. $20$ mL
4. $60$ mL

Q. One mole each of $H_{3}P{O}_2,H_{3}P{O}_3$ and $H_{3}P{O}_4$ will neutralize '$x$' mol of $NaOH,\text{'}y\text{' mol of Ca}{\left(OH\right)}_2$ and $\text{'}z\text{' mol of Al}{\left(OH\right)}_3$ (assuming all to be strong electrolytes) respectively. $x,y$ and $z$ are in the ratio:

1. $3:1.5:1$
2. $1:2:3$
3. $1:1:1$
4. $3:2:1$

Q. Upon heating with $C{u}_{2}S,$ the reagent(s) that give copper metal is/are
(IIT-JEE, Advanced 2014)

1. $C{u}_{2}O$
2. $CuS{O}_4$
3. $CuO$
4. $CuFe{S}_2$

Q. When basic cations like sodium, calcium and magnesium are leached out in humid places by the action of water.

1. Stiff soils are formed
2. Acidic soils are formed
3. Alkaline soils are formed
4. The soil level declines

Q. 5.6 g $KOH$ completely neutralises 0.1 mole of $H_{3}P{O}_x$. Thus $x$ is:

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

Q. Which of the following given fertilizers contains the highest Phosphorus content?

1. Superphosphate
2. Triple Superphosphate
3. Both a and b
4. None of the above

Q. $1,2$-Dibromopropane on treatment with $X$ moles of $Na{NH}_2$ followed by treatment with $C_2{H}_{5}Br$ gives a pentyne. The value of $X$ is:

1. $1$
2. $2$
3. $3$
4. $4$

Q.

1. $6\times {10}^{23},1.5\times {10}^{23},3\times {10}^{28}$
2. $1.5\times {10}^{23},1.5\times {10}^{23},6\times {10}^{23}$
3. $1.5\times {10}^{23},0.75\times {10}^{23},3\times {10}^{23}$
4. $0.75\times {10}^{23},0.75\times {10}^{23},6\times {10}^{23}$

Q. Atomicity of white or yellow phosphorus is 4 and it forms a molecule $-P_4$. Calculate the value of the expression $\frac{x.y}{z}$, where:
$x$: Total number of vertex angles in $P_4$ molecule
$y$: Total number of lone pairs in $P_4$ molecule
$z$: Total number of $P-P$ bonds in $P_4$ molecule