What happens when magnesium ribbon burns in air?
What do you mean by physical and chemical change.
When do you say that a chemical reaction has taken place?
What do you mean by word equation.
List four observations that help us to determine whether a chemical reaction has taken place.
What do you mean by skeletal equation.
Why do we balance a chemical equation?
What is hit and trial method of balancing chemical equation?
Give two limitation of chemical equation and how can we overcome these limitation.
What does the word aq. represent in a chemical equation.
What actually happen during a chemical reaction?
Why water starts boiling if lime is added to it.
The glucose combines with oxygen in our body cells and provides energy. What is the special name of this reaction?
According to energy change what type of reaction is decomposition of vegetable matter into compost.
Give two precautions you take while decomposition reaction of ferrous sulphate.
Is lime natural of man-made substance? Give one use of it.
Name a brown coloured gas that evolved by decomposition reaction of lead nitrate.
Why during electrolysis of water some drops of sulphuric acid is added.
In what ratio hydrogen and oxygen formed during electrolysis of water.
At which electrode hydrogen is collected during electrolysis of water.
Why does silver chloride is stored in dark coloured bottles.
Give formula of ferrous sulphate crystal. Give two changes occur when its crystalline form is heated.
What are precipitates?
A reddish brown element X on heating converted into a black coloured compound Y, which turns phenolphthalein pink. Give interconversion reaction of X and Y.
What is rancidity? Give four methods to slow down it.
What does a complete chemical reaction represent?
What do you mean by oxidation-reduction reaction. Give an example to explain this.
Name three forms in which energy is utilized during decomposition reaction.
What are antioxidants?
What happens when:
Steam is passed through red-hot iron.
Carbon monoxide reacts with hydrogen at 340 atm.
Coal is burnt
Natural gas is burnt.
Manganese dioxide reacts with hydrochloric acid.
Zinc oxide is heated with coke.
Write balanced chemical equation for all the above.
Name a silver salt used in black and white photography.
Chemical reaction & equation
1.A colourless lead salt when heated produces a yellow residue and brown fumes.
Name the lead salt.
Name the brown fumes.
Write balanced chemical equation for the following change. (3)
What happens when a piece of iron metal is placed in copper sulphate solution? Write balanced chemical equation for the following change. (2)
Give reasons for the following
Bags of chips are flushed with nitrogen gas.
Corrosion cause damage to metallic objects. (2)
What is the relationship between oxidation and oxidizing agent in a redox reaction? Write an example of a redox reaction showing the relationship between oxidation and oxidizing agent. (2)
What happens when following reaction takes place? Also write chemical equations and then balance them.
Hydrogen gas combines with nitrogen gas
Hydrogen sulphide burns in air
Barium chloride solution reacts with aluminium sulphate solution.
Potassium metal reacts with water
Nitric acid reacts with slaked lime (5)
Rahul put a substance A in the china dish and left it in the open air near the window. After some time its red colour changes to grey. Translate the above statement in a balanced chemical reaction. Also name the type of the reaction. (2)
In a solution of sodium sulphate a colourless solution is added, which gives an insoluble substance and a soluble substance, sodium chloride. Write the reaction and identify the colourless solution and insoluble substance is formed. (1)
How will you obtain an essential gas for photosynthesis from a calcium compound, which is used to manufacture the raw material for whitewashing? Write balanced chemical equation also. (1)
Give two precautions, which you will take while performing the decomposition of ferrous sulphate crystal. (2)
Correct and balance
Ca + H2O CaOH (2)
Give three differences between displacement and double displacement reaction. (3)
Give one example of
A combination reaction of an element and a compound.
A double displacement reaction.
A decomposition reaction of a compound into two or more compounds .(3)
13.How will you manufacture an organic compound CH4O having molecular mass 32 u with the use of lightest known element. Write balanced chemical equation also.
(2)
Chemical Reactions and Equations ImpQ 01
Chemical Reactions and Equations ImpQ 01 Question Bank on HOTS and other Important Questions for class 10 Science and Technology.
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What do you mean by physical and chemical change.
When do you say that a chemical reaction has taken place?
What do you mean by word equation.
List four observations that help us to determine whether a chemical reaction has taken place.
What do you mean by skeletal equation.
Why do we balance a chemical equation?
What is hit and trial method of balancing chemical equation?
Give two limitation of chemical equation and how can we overcome these limitation.
What does the word aq. represent in a chemical equation.
What actually happen during a chemical reaction?
Why water starts boiling if lime is added to it.
The glucose combines with oxygen in our body cells and provides energy. What is the special name of this reaction?
According to energy change what type of reaction is decomposition of vegetable matter into compost.
Give two precautions you take while decomposition reaction of ferrous sulphate.
Is lime natural of man-made substance? Give one use of it.
Name a brown coloured gas that evolved by decomposition reaction of lead nitrate.
Why during electrolysis of water some drops of sulphuric acid is added.
In what ratio hydrogen and oxygen formed during electrolysis of water.
At which electrode hydrogen is collected during electrolysis of water.
Why does silver chloride is stored in dark coloured bottles.
Give formula of ferrous sulphate crystal. Give two changes occur when its crystalline form is heated.
What are precipitates?
A reddish brown element X on heating converted into a black coloured compound Y, which turns phenolphthalein pink. Give interconversion reaction of X and Y.
What is rancidity? Give four methods to slow down it.
What does a complete chemical reaction represent?
What do you mean by oxidation-reduction reaction. Give an example to explain this.
Name three forms in which energy is utilized during decomposition reaction.
What are antioxidants?
What happens when:
Steam is passed through red-hot iron.
Carbon monoxide reacts with hydrogen at 340 atm.
Coal is burnt
Natural gas is burnt.
Manganese dioxide reacts with hydrochloric acid.
Zinc oxide is heated with coke.
Write balanced chemical equation for all the above.
Name a silver salt used in black and white photography.
Chemical reaction & equation
1.A colourless lead salt when heated produces a yellow residue and brown fumes.
Name the lead salt.
Name the brown fumes.
Write balanced chemical equation for the following change. (3)
What happens when a piece of iron metal is placed in copper sulphate solution? Write balanced chemical equation for the following change. (2)
Give reasons for the following
Bags of chips are flushed with nitrogen gas.
Corrosion cause damage to metallic objects. (2)
What is the relationship between oxidation and oxidizing agent in a redox reaction? Write an example of a redox reaction showing the relationship between oxidation and oxidizing agent. (2)
What happens when following reaction takes place? Also write chemical equations and then balance them.
Hydrogen gas combines with nitrogen gas
Hydrogen sulphide burns in air
Barium chloride solution reacts with aluminium sulphate solution.
Potassium metal reacts with water
Nitric acid reacts with slaked lime (5)
Rahul put a substance A in the china dish and left it in the open air near the window. After some time its red colour changes to grey. Translate the above statement in a balanced chemical reaction. Also name the type of the reaction. (2)
In a solution of sodium sulphate a colourless solution is added, which gives an insoluble substance and a soluble substance, sodium chloride. Write the reaction and identify the colourless solution and insoluble substance is formed. (1)
How will you obtain an essential gas for photosynthesis from a calcium compound, which is used to manufacture the raw material for whitewashing? Write balanced chemical equation also. (1)
Give two precautions, which you will take while performing the decomposition of ferrous sulphate crystal. (2)
Correct and balance
Ca + H2O CaOH (2)
Give three differences between displacement and double displacement reaction. (3)
Give one example of
A combination reaction of an element and a compound.
A double displacement reaction.
A decomposition reaction of a compound into two or more compounds .(3)
13.How will you manufacture an organic compound CH4O having molecular mass 32 u with the use of lightest known element. Write balanced chemical equation also.
(2)
Chemical Reactions and Equations ImpQ 01
Chemical Reactions and Equations ImpQ 01 Question Bank on HOTS and other Important Questions for class 10 Science and Technology.
Download Now
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