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Standard X

Chemistry

Endothermic and Exothermic Reaction

Select the re...

Question

Select the reaction which is not an exothermic reaction?

CH_4(g) + 2O_2(g) → CO_2(g) + H₂O_(g)

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CaO_(s) + H₂O_(l) → Ca(OH)_2(aq)

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CaCO₃ → CaO + CO₂

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C₆H₁₂O_6(aq) + 6O_2(aq) + 6H₂O_(l) → 6CO_2(aq) + 12H₂O_(l)

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Solution

The correct option is C
CaCO₃ → CaO + CO₂

CaCO₃→ CaO + CO₂ is an endothermic reaction.

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Similar questions

Consider the reactions:

(a) 6 CO₂(g) + 6H₂O(l) → C₆ H₁₂ O₆(aq) + 6O₂(g)

(b) O₃(g) + H₂O₂(l) → H₂O(l) + 2O₂(g)

Why it is more appropriate to write these reactions as:

(a) 6CO₂(g) + 12H₂O(l) → C₆ H₁₂ O₆(aq) + 6H₂O(l) + 6O₂(g)

(b) O₃(g) + H₂O₂ (l) → H₂O(l) + O₂(g) + O₂(g)

Also suggest a technique to investigate the path of the above (a) and (b) redox

reactions.

Q. What is the relation between

Δ H

and

Δ E

in this reaction?

C H_{4 (g)} + 2 O_{2 (g)} ⇌ C O_{2 (g)} + 2 H_{2} O_{(l)}

Q. From the following data:
(i)

H_{2} (g) + C O_{2} (g) ⇌ H_{2} O (g) + C O (g)

;

K_{2000 K} = 4.4

(ii)

2 H_{2} O (g) ⇌ {2 H}_{2} (g) + {2 O}_{2} (g)

;

K_{2000 K} = 5.31 \times 10^{- 10}

(iii)

2 C O (g) + {2 O}_{2} (g) ⇌ 2 C O_{2} (g)

;

K_{1000 K} = 2.24 \times 10^{22}

State whether the reaction (iii) is exothermic or endothermic?

Complete and balance the following reaction:

${CH}_{4} (g) + O_{2} (g) \to$

Q. Assertion :

C a C O_{3} (s) + 2 H C l (a q) ⟶ C a C l_{2} (a q) + H_{2} C O_{3} (a q)

C a C O_{3} (s) + 2 H^{+} (a q) + 2 C l^{-} (a q) ⟶ [C a^{2 +} (a q) + 2 C l^{-} (a q)] + H_{2} C O_{3} (a q)

Thus, net reaction is

C a C O_{3} (s) + 2 H^{+} (a q) ⟶ C a^{2 +} (a q) + H_{2} C O_{3} (a q)

This is an exothermic reaction (in which heat is evolved) and thus there is thermal decomposition of carbonic acid into gaseous carbon dioxide and water. Reason: Heat evolved in the reaction (exothermic) causes decomposition of

H_{2} C O_{3} (a q)

into

C O_{2} (g)

and

H_{2} O (l)

H_{2} C O_{3} ⟶ H_{2} O (l) + C O_{2} (g)

Thus,

H_{2} C O_{3}

is unstable.

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Select the reaction which is not an exothermic reaction?

The correct option is C CaCO3 → CaO + CO2CaCO3 → CaO + CO2 is an endothermic reaction.

The correct option is C
CaCO₃ → CaO + CO₂

CaCO₃→ CaO + CO₂ is an endothermic reaction.