Phosphine

Q.

Holmes signals can be given by using

1. ${\mathrm{CaC}}_2+{\mathrm{CaCN}}_2$

2. ${\mathrm{CaC}}_2+{\mathrm{Ca}}_3{\mathrm{P}}_2$

3. ${\mathrm{CaC}}_2+{\mathrm{CaCO}}_3$

4. ${\mathrm{Ca}}_3{\mathrm{P}}_2+{\mathrm{CaCN}}_2$

Q.

Give balanced equation for the action of heat on :

Lead nitrate

Q. Among the following, the correct statement(s) is/are:
Between $N{H}_3$ and $P{H}_3$

1. $P{H}_3$ is a better electron donor because the lone pair of electrons occupies the spherical $s$ orbital and is less directional
2. $N{H}_3$ is a better electron donor because the lone pair of electrons occupies the $s{p}^3$ orbital and is more directional
3. $P{H}_3$ is a better electron donor because the lone pair of electrons occupies the $s{p}^3$ orbital and is more directional
4. $N{H}_3$ is a better electron donor because the lone pair of electrons occupies the spherical $s$ orbital and is less directional

Q.

Write a balanced chemical equation for each of the following:

Reaction of ammonia with heated copper oxide.

Q.

What is the product formed when white phosphorus reacts with caustic soda?

Q.

When a solution of phosphine in water is decomposed in the presence of light, __ phosphorus is obtained

Q.

At a temperature under high pressure
$K_w={10}^{-10}$, A solution of pH =5.4 ; Under these conditions is said to be -

1. Acidic

2. Basic

3. Neutral

4. Amphoteric

Q. Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The H–O–H bond angle in water molecule is ${104.5}^o$.
Reason R : The lone pair–lone pair repulsion of electrons is higher than the bond pair-bond pair repulsion.

1. A is false but R is true
2. Both A and R are true, but R is not the correct correct explanation of A
3. A is true but R is false
4. Both A and R are true, and R is the correct explanation of A

Q.

Write balanced chemical equation for which of the following-

Reaction of ammonia with heated copper oxide

Q. Dissolving $1.24\text{g}$ of white phosphorous in boiling $\text{NaOH}$ solution in an inert atmosphere gives a gas Q. The amount of ${\text{CuSO}}_4$ (in $\text{g}$ ) required to completely consume the gas $\text{Q}$ is .
[Given : Atomic mass of $\text{H}=1,\text{O}=16,\text{Na}=23,\text{P}=31,$ $\text{S}=32,\text{Cu}-63$ ]

Q. If m and e are the mass and charge of revolving electron in the orbit of radius r for hydrogen atom then what is the total energy of the revolving electron?

Q. The total number of electrons donated by ligands to platinum ion in [Pt(en)2CI2] is (2) 10 (4) 14 (3) 12

Q. Name three oxoacids of nitrogen. Write the disproportionation reaction of that oxoacid of nitrogen in which nitrogen is in +3 oxidation state.

Q.

The Bosch process is used for the large-scale production of hydrogen. Write a balanced reaction.

Q. When a small amount of solid calcium phosphide ($C{a}_3{P}_2$) is added to water, what are the most likely products formed?

1. Aqueous $C{a}^{2+}$ and $O{H}^{-}$ ions and $P{H}_3$ gas
2. Aqueous $C{a}^{2+}$ and $O{H}^{-}$ ions and $H_{3}P{O}_3$
3. Solid $Ca{H}_2$ and $H_{3}P{O}_3$
4. Solid $CaO$ and $P{H}_3$ gas

Q.

An acid is regarded as strong if it:

1. is highly soluble in water

2. turns blue litmus red

3. has a strong action on skin.

4. is completely dissociated in an aqueous solution.

Q. In the reaction : [Ag(CN)2]– + Zn → the complex formed will be tetrahedral. WHY----

Q. Holmes signals can be given by using :

1. $Ca{C}_2+C{a}_3{P}_2$
2. $Ca{C}_2+CaC{N}_2$
3. $Ca{C}_2+CaC{O}_3$
4. $C{a}_3{P}_2+CaC{N}_2$

Q.

Write a balanced chemical equation for the following reaction:

Aluminum nitride is heated with water.

Q. When a small amount of solid calcium phosphide ($C{a}_3{P}_2$) is added to water, what are the most likely products formed?

1. Aqueous $C{a}^{2+}$ and $O{H}^{-}$ ions and $P{H}_3$ gas
2. Aqueous $C{a}^{2+}$ and $O{H}^{-}$ ions and $H_{3}P{O}_3$
3. Solid $Ca{H}_2$ and $H_{3}P{O}_3$
4. Solid $CaO$ and $P{H}_3$ gas

Q.

Balance the following chemical reaction by identifying the products:

${\mathrm{Fe}}_3{\mathrm{O}}_4+\mathrm{HCl}\to {\mathrm{FeCl}}_2+{\mathrm{FeCl}}_3+\mathrm{\_\_\_\_\_}$

Q. From the given metal nitrides how many will produce ammonia on hydrolysis?
$AlN,M{g}_3{N}_2,L{i}_{3}N,B{a}_3{N}_2,C{a}_3{N}_2$

Q. How many metal nitrides among the following will produce ammonia on hydrolysis?
$AlN,M{g}_3{N}_2,L{i}_{3}N,B{a}_3{N}_2,C{a}_3{N}_2$

1. $1$
2. $2$
3. $4$
4. $5$

Q.

How many moles of Nacl will be formed from the combination of 1 mole of Na and cl each. What will be the excess reactants in the chemical reaction.

Q.

What poisons the Catalytic chamber?

1. Nitrogen monoxide

2. Excess air

3. Platinum gauze

4. Impurities

Q.

1. $N{H}_3<P{H}_3<As{H}_3<Sb{H}_3$
2. $N{H}_3>Sb{H}_3>As{H}_3>P{H}_3$
3. $N{H}_3>P{H}_3>As{H}_3>Sb{H}_3$
4. $N{H}_3>Sb{H}_3>P{H}_3>As{H}_3$

Q. Which of the following is correct order of bond angle?
$\left(1\right)N{H}_3>P{H}_3>N{F}_3\left(2\right)N{F}_3>N{H}_3>P{H}_3$
$\left(3\right)N{H}_3>N{F}_3>P{H}_3\left(4\right)P{H}_3>N{H}_3>N{F}_3$

Q.

Write a balanced chemical reaction when potassium iodide reacts with lead nitrate?

Q.

Write balanced equation for the following reaction:

A mixture of ammonium chloride and slaked line

Q.

Write balanced equations for the following reactions:
(c) Lead chloride from lead nitrate solution and sodium chloride solution