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Standard XII
Chemistry
Phosphine
Question

White phosphorous on reaction with limewater gives calcium salt of an acid $$(A)$$ along with a gas $$(X)$$. Which of the following is correct?

A
The bond angle in $$(X)$$ is less than that in case of ammonia
B
$$(X)$$ is more than ammonia
C
$$(A)$$ on heating gives $$(X)$$ and $$O_2$$
D
$$(A)$$ is a dibasic acid
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Solution
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Correct option is B. The bond angle in $$(X)$$ is less than that in case of ammonia

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Similar Questions
Q1
White phosphorous on reaction with limewater gives calcium salt of an acid $$(A)$$ along with a gas $$(X)$$. Which of the following is correct?
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Q2
Zinc on reaction with $$NaOH$$ gives a salt $$(A)$$ along with a gas $$(X)$$ and $$(A)$$ on reaction with a gas $$(Y)$$ gives white precipitate $$(W)$$. Which of the following is correct?
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Q3
Answer the question by selecting the appropriate option given below:

Assertion (A): The gas produced during the reaction of sodium carbonate with hydrochloric acid when passed through limewater, turns limewater milky.

Reason (R): Carbon dioxide reacts with limewater to form calcium hydrogen carbonate which forms a white precipitate.

[0.8 marks]
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Q4
(i) Sodium salt of an acid $$(A)$$ is formed on boiling white phosphorous with $$NaOH$$ solution.
(ii) On passing chlorine through phosphorous kept fused under water, another acid $$(B)$$ is formed which on strong heating gives metaphosphorous acid.
(iii) Phosphorous on treatment with conc. $$HNO_3$$ gives an acid $$(C)$$ which is also formed by the action of dilute $$H_2SO_4$$ on powdered phosphorite rock.
(iv) $$(A)$$ on treatment with a solution of $$HgCl_2$$ first gives a white precipitate of compound $$(D)$$ and then a grey precipitate of $$(E)$$.
Identify $$(A)$$ to $$(E)$$ and write balanced equations for the reactions at step (i) to (iv).
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Q5
On heating with concentrated NaOH solution in an inert atmosphere of CO2, white phosphorous gives a gas. Which of the following statement is incorrect about the gas?
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