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The following question consist of two statements one labelled $ASSERTION (A)$ and the another labelled $REASON (R)$ . Select the correct answer to the question from the codes given below:

$Assertion :$ Pure phosphine is non-inflammable.

$Reason :$ Impure phosphine is inflammable owing to the presence of $P_{2} H_{4}$ or $P_{4}$ vapours.

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Important Questions on The p-Block Elements

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Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

The pair that contains two

P - H

bonds in each of the oxoacids is:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

When copper is heated with conc.

H N O_{3}

it produces:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Good reducing nature of

H_{3} P O_{2}

is attributed to the presence of:

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Which of the following compounds has a

P - P

Bond?

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Which of the following oxy-acids has the maximum number of hydrogens directly attached to phosphorus?

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Strong reducing behaviour of

H_{3} P O_{2}

is due to:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Identify the correct statement from the statements given below.

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Consider the following statements concerning

N_{2} H_{4} :

(i) It is an exothermic compound.

(ii) It burns in air with the evolution of heat.

(iii) It has kinetic stability.

(iv) It reduces

F e^{3 +}

F e^{2 +}

in acidic medium.

Which of the following combinations is correct?

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Which among the following oxoacids of phosphorus shows a tendency of disproportionation?

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Excess of ammonia with sodium hypochlorite solution in the prescence of glue or gelatine gives:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Among the following compounds, the one which does NOT produce nitrogen gas upon heating is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Which of the following reactions cannot liberate phosphine?

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Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Among the oxides of nitrogen:

N_{2} O_{3}, N_{2} O_{4} a n d N_{2} O_{5};

the molecule

(s)

having nitrogen - nitrogen bond is/are:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Iodine reacts with concentrated

H N O_{3}

to yield

Y

along with other products. The oxidation state of iodine in

Y

, is:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

The most stable Lewis acid-base adduct among the following is

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Consider the following compounds:

1 . {(N H_{4})}_{2} C r_{2} O_{7}

2 . N H_{4} N O_{2}

3 . N H_{4} V O_{3}

4 . N H_{4} N O_{3}

Which compound(s) yield(s) nitrogen gas upon heating?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

The product obtained as a result of a reaction of nitrogen with

C a C_{2}

is:

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Which of the following reactions DOES NOT produce

{PH}_{3}

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Chemistry>Inorganic Chemistry>The p-Block Elements>Phosphene: Preparation, Structure, Properties and Uses

Phosphine is generally prepared in the laboratory by

Important Questions on The p-Block Elements

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