(A) When hydrogen gas $(H_2)$ and oxygen gas $(O_2)$ combine,they react to form water $(H_2O)$.The chemical equation for this reaction is: $2H_2(g) +

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(A) When hydrogen gas $(H_2)$ and oxygen gas $(O_2)$ combine,they react to form water $(H_2O)$.The chemical equation for this reaction is: $2H_2(g) + O_2(g) \rightarrow 2H_2O(l)$.Water is a liquid at room temperature.

Class 11 Chemistry Hydrogen Water or hydride of oxygen

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Hydrogen and oxygen are both gases. What compound is formed by their combination?

A
Water $(H_2O)$
B
Hydrogen peroxide $(H_2O_2)$
C
Hydroxyl radical $(OH)$
D
Ozone $(O_3)$

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Class 11

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Chapter

Hydrogen

Subtopic

Water or hydride of oxygen

Give reason: Hard water is not suitable for washing clothes.

Easy

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Match the following methods for treating hardness of water with their corresponding reagents used.
List-$I$ List-$II$
$A$. Treatment with washing soda $I$. $Ca(OH)_2$
$B$. Calgon's method $II$. $Na_2CO_3$
$C$. Clark's method $III$. $NaAlSiO_4$
$D$. Zeolite/permutit process $IV$. $Na_6P_6O_{18}$

The correct match is:

List-$I$	List-$II$
$A$. Treatment with washing soda	$I$. $Ca(OH)_2$
$B$. Calgon's method	$II$. $Na_2CO_3$
$C$. Clark's method	$III$. $NaAlSiO_4$
$D$. Zeolite/permutit process	$IV$. $Na_6P_6O_{18}$

EasyTS EAMCET 2020

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