Advertisements
Advertisements
प्रश्न
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
उत्तर
NaOH + HCI `→` NaCI + `H_2O`
APPEARS IN
संबंधित प्रश्न
When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Name three biochemical catalysts found in the human body.
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Define catalyst.
FILL IN THE BLANK
A .............. change is a temporary change.
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
FILL IN THE BLANK
Positively charged ions are called ........
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
A chemical equation is a statement that describes a chemical change in terms of
Explain the following reaction with one suitable example of Combination reactions .
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.
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.
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Complete and balance the following reaction:
Pb(NO3)2 + KI →
What do you observe when HCI is passed through a silver nitrate solution.
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Complete the table given below.
Flame test for calcium chloride | Acid used for flame test |
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Limestone contains ______ mainly.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
______ change results in the change of the substance.
Match the following:
1. | Sodium Chloride | a. | CaSO41/2H2O |
2. | Calcium sulphate dihydrate | b. | C2H5Oh |
3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
4. | Calcium sulphate hemihydrate | d. | NaCl |
5. | Phenol | e. | MgSO4.H2O |
A chemical change may involve –
Write the equation for the process of formation of rust.
Explain how the painting of an iron gate prevents it from rusting.
We are advised to not to play with fireworks. Give reason.