When the diamond is heated at 1800 - 2000 -C in a vacuum it converts into-

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Standard VII

Chemistry

Graphite

When the diam...

Question

When the diamond is heated at 1800 - 2000 $^{\circ} C$ in a vacuum it converts into:

graphite

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coke

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C O_{2}

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C O

C O_{2}

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Solution

The correct option is A graphite
Graphite is the most stable allotrope of carbon and hence all other allotropes turn into graphite at higher temperatures. Diamond turns into graphite at a temperature between 1800K and 2000K.

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Similar questions

Q. Answer the following questions based on the P – T phase diagram of CO2: (a) CO2 at 1 atm pressure and temperature – 60 °C is compressed isothermally. Does it go through a liquid phase ? (b) What happens when CO2 at 4 atm pressure is cooled from room temperature at constant pressure ? (c) Describe qualitatively the changes in a given mass of solid CO2 at 10 atm pressure and temperature –65 °C as it is heated up to room temperature at constant pressure. (d) CO2 is heated to a temperature 70 °C and compressed isothermally. What changes in its properties do you expect to observe ?

C

(diamond)

\to

C

(graphite),

Δ S_{300} = 10

cal

m o l^{- 1}

C

(diamond)

+ O_{2} \to C O_{2}

;

Δ H = - 91

kcal

m o l^{- 1}

300

C

(graphite)

+ O_{2} \to C O_{2}

;

Δ H = x

300

x

is:

Q. The correct order of increasing

C - O

bond length in

C O, C O_{3}^{2 -}, C O_{2}

and

C O^{+}

is:

Q. Answer the following questions based on the P-T phase diagram of

C O_{2}

(a)

C O_{2}

at 1 atm pressure and temperature

- 60^{o} C

is compressed isothermally. Does it go through a liquid phase?
(b) What happens when

C O_{2}

at 4 atm pressure is cooled from room temperature at constant pressure?

C O_{2}

at 10 atm pressure and temperature

- 65^{o} C

as it is heated up to room temperature at constant pressure .

(d)

C O_{2}

is heated to a temperature

70^{o} C

and compressed isothermally. What changes in its properties do you expect to observe?

Q. A vessel at

1000 K

contains

C O_{2}

with a pressure of

0.5 a t m

. Some of

C O_{2}

is converted into

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on addition of graphite. The value of

^{'} K_{p}^{'}

at equilibrium when total pressure is

0.8 a t m

will be ?

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When the diamond is heated at 1800 - 2000∘C in a vacuum it converts into:

The correct option is A graphiteGraphite is the most stable allotrope of carbon and hence all other allotropes turn into graphite at higher temperatures. Diamond turns into graphite at a temperature between 1800K and 2000K.

When the diamond is heated at 1800 - 2000 $^{\circ} C$ in a vacuum it converts into:

The correct option is A graphite
Graphite is the most stable allotrope of carbon and hence all other allotropes turn into graphite at higher temperatures. Diamond turns into graphite at a temperature between 1800K and 2000K.