Advertisements
Advertisements
प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Advertisements
उत्तर
`"H"_2"S"` + `"CI"_2` `→` 2HCI + S
APPEARS IN
संबंधित प्रश्न
Give reason.
Acidic soil is treated with quick lime.
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
What are chemical reactions?
Fill in the blank:
The substances which undergo chemical change are called _______
State four conditions necessary for a chemical reaction to take place.
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Oxygen is a ______ in respiration.
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.
Define an electrochemical reaction.
Give an example of the following chemical change.
A reaction where colour change is noticed
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
What is the use of indicator?
______ is a natural indicator.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Explain how the painting of an iron gate prevents it from rusting.
