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Why is White Phosphorus Kept Immersed Under Water?

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प्रश्न

Why is white phosphorus kept immersed under water?

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उत्तर

White phosphorus is kept immersed in water because it starts burning spontaneously when it comes into contact with air. But it does not react with water.

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अध्याय 3: Metals and Non-metals - Exercise 1 [पृष्ठ १३४]

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लखमीर सिंग Chemistry [English] Class 10
अध्याय 3 Metals and Non-metals
Exercise 1 | Q 51.2 | पृष्ठ १३४

संबंधित प्रश्न

Write equations for the reactions of calcium and potassium with water.


Which gas is produced when dilute hydrochloric acid is added to a reactive metal? 


A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.

In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.


What will happen if a strip of zinc is immersed in a solution of copper sulphate?


Fill in the following blank with suitable word:

 Magnesium liberates ............... gas on reacting with hot boiling water.


Which of the following elements would yield an acidic oxide.

Na, S, C, K, H


What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.


Give one example, with equation, of the displacement of hydrogen by a metal from an acid.


What is the action of water on aluminium ? Write equation of the chemical reaction involved.


What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.


The metals which can produce amphoteric oxides are:
(a) sodium and aluminium
(b) zinc and potassium
(c) calcium and sodium
(d) aluminium and zinc


The elements whose oxides can turn litmus solution red are:
(a) lithium and sodium
(b) copper and potassium
(c) carbon and hydrogen
(d) phosphorus and sulphur


A metal less reactive and another metal more reactive than hydrogen are:
(a) aluminium and lead
(b) iron and magnesium
(c) copper and tin
(d) copper and mercury


An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be:
(a) S
(b) Ca
(c) C
(d) Ag


An element is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na


Calcium floats over water during the reaction with water. Give reason.  


Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example. 


Write the chemical equation for the following reaction:
Calcium metal reacts with water.


Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.


Why is acidified water considered to be a good conductor of electricity?


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