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Ionic Radii and Ionisation Enthalpy (Group 2)

Element A bur...

Question

Element (A) burns in nitrogen to given an ionic compound (B). Compound (B) reacts with water to give (C) and (D). A solution of (C) becomes 'milky' on bubbling carbon dioxide. (A), (B), (C) and (D) are identified as Ca, $C a_{3} N_{2}$ , $C a (O H)_{2}$ and $N H_{3}$ .

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Solution

Calcium burns in nitrogen to given an ionic compound calcium nitride.
$3 C a + N_{2} \to C a_{3} N_{2}$
Calcium nitride reacts with water to give calcium hydroxide and ammonia..
$C a_{3} N_{2} + 6 H_{2} O \to 3 C a (O H)_{2} + 2 N H_{3}$
A solution of calcium hydroxide becomes 'milky' on bubbling carbon dioxide.
$C a (O H)_{2} + C O_{2} \to C a C O_{3}$

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Similar questions

Q. Element A burns in nitrogen to give an ionic compound B. Compound B reacts with water to give C and D. A solution of C becomes 'milky' on bubbling carbon dioxide. Identify A, B, C, and D.

Q. The element A burns in nitrogen to give an ionic compound B. The compound B reacts with water to give C and D. A solution of C becomes milky on bubbling carbon dioxide. what is the nature of compound (D)?

Q. An aqueous solution of salt (A) gives a white crystalline precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when

H_{2} S

is passed through it. Compound (B) dissolves in hot water and the solution gives yellow precipitate (D) on treatment with potassium iodine and on cooling. The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating. Compounds (A) to (D) are identified as:

P b (N O_{3})_{3}

P b C l_{2}

P b S

P b I_{2}

If true enter 1, else enter 0.

Q. Read the following statements:
(i) A white amorphous powder (A) on strongly heating gives a colourless non-combustile gas (B) and solid (C).
(ii) The gas (B) turns lime water milky and turbidity disappear with the passage of excess of gas.
(iii) The solution (C) in dilute HCl gives a white precipitate with an aqueous solution of

K_{4} [F e (C N)_{6}]

.
(iv) The solution of (A) gives a white precipitate (D) on pasiing

H_{2} S

in presence of excess of

N H_{4} O H

.
Compound (A) to (D) are identified as:
(A) :

Z n C O_{3}

C O_{2}

Z n O

Z n S

If true enter 1, else enter 0.

Q. (i) A black mineral (A) on heating in presence of air gives a gas (B).
(ii) The mineral (A) on reaction with dilute

H_{2} S O_{4}

gives a gas (C) and solution of a compound (D).
(iii) On passing gas (C) into an aqueous solution (B), a white turbidity is obtained.
(iv) The aqueous solution of compound (D) on reaction with potassium ferricyanide gives a blue compound (E).

Compounds (A) to (E) are identified as:

F e S

S O_{2}

H_{2} S

F e S O_{4}

K F e^{I} I [F e^{I} I I (C N)_{6}]

If true enter 1, else enter 0.

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