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Standard XII

Chemistry

Synthetic Dyes

Assertion :Po...

Question

Assertion :Potassium and sodium react with water. Reason: Both $N a$ and $K$ liberate $H_{2}$ on reacting with water.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Sodium or potassium react with water to form their hydroxides and liberate hydrogen.
$2 N a + 2 H_{2} O \to 2 N a O H + H_{2}$
$2 K + 2 H_{2} O \to 2 K O H + H_{2}$

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Similar questions

Q. Assertion: The compressibility factor for

H_{2}

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H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

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{SiO}_{2}

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Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :Potassium and sodium react with water. Reason: Both Na and K liberate H2 on reacting with water.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionSodium or potassium react with water to form their hydroxides and liberate hydrogen.2Na+2H2O→2NaOH+H22K+2H2O→2KOH+H2

Assertion :Potassium and sodium react with water. Reason: Both $N a$ and $K$ liberate $H_{2}$ on reacting with water.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Sodium or potassium react with water to form their hydroxides and liberate hydrogen.
$2 N a + 2 H_{2} O \to 2 N a O H + H_{2}$
$2 K + 2 H_{2} O \to 2 K O H + H_{2}$