Medium
$A$ small amount of quicklime is added to water in a beaker.
$(a)$ Name and define the type of reaction that has taken place.
$(b)$ Write the balanced chemical equation for the above reaction. Write the chemical name of the product obtained.
$(c)$ State two observations that you will make in the reaction.
$(a)$ Name and define the type of reaction that has taken place.
$(b)$ Write the balanced chemical equation for the above reaction. Write the chemical name of the product obtained.
$(c)$ State two observations that you will make in the reaction.
(N/A) This is a combination reaction. It is defined as a reaction in which a single product is formed from two or more reactants.
$(b)$ The balanced chemical equation is: $CaO(s) + H_2O(l) \rightarrow Ca(OH)_2(aq)$. The chemical name of the product obtained is calcium hydroxide.
$(c)$ Two observations made during the reaction are:
$(i)$ The reaction occurs vigorously with the evolution of heat (exothermic reaction).
$(ii)$ The beaker becomes hot to the touch due to the release of thermal energy.
$(b)$ The balanced chemical equation is: $CaO(s) + H_2O(l) \rightarrow Ca(OH)_2(aq)$. The chemical name of the product obtained is calcium hydroxide.
$(c)$ Two observations made during the reaction are:
$(i)$ The reaction occurs vigorously with the evolution of heat (exothermic reaction).
$(ii)$ The beaker becomes hot to the touch due to the release of thermal energy.
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$(a)$ Gypsum is heated at $373 \, K$.
Also,write the chemical equation for the reaction.
$(a)$ Gypsum is heated at $373 \, K$.
Also,write the chemical equation for the reaction.
Medium
View Solution$2 \, g$ of ferrous sulphate crystals are heated in a boiling tube.
$(i)$ State the colour of ferrous sulphate crystals both before heating and after heating.
$(ii)$ Name the gases produced during heating.
$(iii)$ Write the chemical equation for the reaction.
$(i)$ State the colour of ferrous sulphate crystals both before heating and after heating.
$(ii)$ Name the gases produced during heating.
$(iii)$ Write the chemical equation for the reaction.
Medium
View Solution$(a)$ Give an example of a combination reaction which is exothermic.
$(b)$ Identify the oxidizing agent and reducing agent in the following reaction:
$H_{2}S + Cl_{2} \rightarrow 2HCl + S$
$(c)$ Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in the open. Suggest one method to prevent it.
$(b)$ Identify the oxidizing agent and reducing agent in the following reaction:
$H_{2}S + Cl_{2} \rightarrow 2HCl + S$
$(c)$ Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in the open. Suggest one method to prevent it.
Medium
View SolutionWhich of the following statements about the given reaction are correct?
$3 Fe (s) + 4 H_2 O (g) \rightarrow Fe_3 O_4 (s) + 4 H_2 (g)$
$(i)$ Iron metal is getting oxidised
$(ii)$ Water is getting reduced
$(iii)$ Water is acting as reducing agent
$(iv)$ Water is acting as oxidising agent
$3 Fe (s) + 4 H_2 O (g) \rightarrow Fe_3 O_4 (s) + 4 H_2 (g)$
$(i)$ Iron metal is getting oxidised
$(ii)$ Water is getting reduced
$(iii)$ Water is acting as reducing agent
$(iv)$ Water is acting as oxidising agent
Medium
View SolutionWhich one of the following is a chemical change? Give reason also.
$A$. Burning of wax
$B$. Melting of wax
$A$. Burning of wax
$B$. Melting of wax
Medium
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