Advertisements
Advertisements
प्रश्न
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
उत्तर
- Reactants
Left hand side write the reactants (substances which take part in a reaction).
- Products
Right hand side write the products (substances formed as a result of the reaction).
Chemical equation formed is
\[\ce{\underset{\text{[dil.]}}{Zn} + H2SO4 -> ZnSO4 + H2[g]}\]
The function of the arrow (→) between the reactants and products is that it represents the chemical reaction taken place between two reactants.
APPEARS IN
संबंधित प्रश्न
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
How do the following help in bringing about a chemical change?
catalyst .
Define; catalyst.
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
What are oxides ?
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
What are the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.
How is a strong electrolyte different from a weak electrolyte?
What do you observe when :
an iron nail is kept in tap water for few days
State four conditions necessary for chemical reactions to take place.
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
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)
Rusting of iron is a ______ chemical change.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
Give an example of a reaction where the following are involved
Catalyst
What do you understand by precipitation reaction? Explain with examples.
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Complete and balance the following reaction:
\[\ce{Pb(NO3)2 ->[\Delta]}\]
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
|
|
Shake the gas with red litmus solution |
||||
|
Shake the gas with blue litmus solution |
||||
|
Apply a burning splint to a gas |
What do you observe when H2S is passed through a lead nitrate solution.
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 white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
Which of the following is not an “element + element → compound” type reaction?
Chemists identify gypsum as a natural indicator.
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 |
Beating an egg to make a cake is a ______.
When magnesium is burnt in the air, a new substance is formed which is ______.
Is the conversion of milk into ice cream a chemical change?
How would you show that the settling of curd is a chemical change?
