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Question
Give reason .
A person suffering from acidity is advised to take an antacid.
Solution
An antacid neutralizes stomach acidity.
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| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Define chemical reaction.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
Explain the term reactant and product giving examples.
Write the chemical reaction where the following changes are observed.
Gas is evolved
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Give an example of the following chemical changes.
A reaction involving
(i) Change of state
(ii) formation of precipitate
Define:
Photochemical reaction
Give one example
Name: A brown gas
What is observed in performing the following :
| Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
| Litmus test | ||||
| Apply a burning splint to the gas | ||||
| Colour of gas | colourless | colourless | colourless | greenish-yellow |
| Odour of gas |
What do you observe when HCI is passed through a silver nitrate solution.
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves a black residue and evolves two gases one of which is acidic and coloured and the other neutral and colourless.
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
Explain the term chemical reaction with special reference to reactants and products.
A chemical reaction is often accompanied by external indications or characteristics.
What happens when cane sugar is strongly heated? Mention any two changes in it.
_____ is the basic material to manufacture urea.
Silver metal can displace hydrogen gas from nitric acid.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
Chemical changes are important in our day-to-day life. Give examples.
Both CO2 and H2 gases are ______.
Define the following term:
Chemical change
