Chemistry
Complete the statements by filling in the blank with the correct word/s :
- Direct combination reaction of sulphur dioxide with water gives …………… [H2SO4/H2SO3/H2S2O7].
- Formation of hydrogen chloride from hydrogen and chlorine is an example of …………… [photochemical reaction / electrochemical reaction].
- The reaction of hydrogen burning in oxygen to give a neutral liquid is an example of …………… [exothermic/endothermic] reaction.
- The neutral gas evolved when lead nitrate undergoes thermal decomposition is …………… [nitrogen dioxide/oxygen/nitrogen].
- The reddish brown precipitate obtained during a double decomposition - precipitation reaction between an iron salt and an alkali is …………… [iron [II] hydroxide / iron [III] hydroxide]
Chemical Reaction
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Answer
- Direct combination reaction of sulphur dioxide with water gives H2SO3
- Formation of hydrogen chloride from hydrogen and chlorine is an example of photochemical reaction.
- The reaction of hydrogen burning in oxygen to give a neutral liquid is an example of exothermic reaction.
- The neutral gas evolved when lead nitrate undergoes thermal decomposition is oxygen.
- The reddish brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and an alkali is iron [III] hydroxide.
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Related Questions
Explain the term energy changes in a chemical change or reaction. Give an example with a balanced equation, for each of the following reactions:
(a) exothermic reaction
(b) endothermic reaction
(c) photochemical reaction
(d) electrochemical reaction.
Supply of energy maybe required to initiate a reaction. State the different forms with a suitable example of reactions initiated by supply of energy.
Select the correct answer from A, B, C, D and E for each statement given below :
A : Ammonia
B : Hydrogen chloride
C : Hydrogen
D : Nitrogen dioxide
E : Nitric oxideState the gaseous product formed, when -
- An active metal reacts with dilute sulphuric acid.
- A metallic nitrate undergoes thermal decomposition giving a coloured gas.
- Two gases one of them neutral, combines by absorption of light energy.
- An ammonium salt reacts with an alkali.
- An exothermic reaction takes place between ammonia and a neutral gas.
Give a balanced equation for each of the following types of reactions :
- A direct combination reaction between phosphorus and a neutral gas.
- A soluble salt of lead formed from an insoluble base by double decomposition – neutralization.
- A thermal decomposition reaction of a salt – which results in the formation of nitrogen gas.
- A synthesis reaction between a metal & a non-metal resulting in formation of an insoluble salt of iron.
- A decomposition reaction of a salt which leaves behind a silvery metal.