Advertisements
Advertisements
प्रश्न
Define chemical reaction.
Advertisements
उत्तर
Any chemical change in matter that involves its transformation into one or more new substances is called a chemical reaction.
संबंधित प्रश्न
How would you show that setting of curd is a chemical change?
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Give a reason.
Wasp sting is treated with vinegar.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
Name three reducing agents ?
Fill in the blank:
The substances which undergo chemical change are called _______
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
_____ is the basic material to manufacture urea.
Chemists identify gypsum as a natural indicator.
Write some materials prepared by chemical changes.
______ is a natural indicator.
The chemical name of baking soda is sodium bicarbonate.
