Advertisements
Advertisements
Question
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute hydrochloric acid to silver nitrate.
Advertisements
Solution
Addition of dil. hydrochloric acid to silver nitrate: A white coloured precipitate of AgCl is seen.
APPEARS IN
RELATED QUESTIONS
How do the following help in bringing about a chemical change?
pressure.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
What do you observe when :
an iron nail is kept in tap water for few days
True or false
New substances are formed in a chemical change.
Balancing a chemical equation is based on
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)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
When electric current is passed through acidulated water ______ of water takes place.
What is a chemical reaction?
Define the following term:
Precipitate
Give an example of a reaction where the following are involved
Pressure
Multiple choice:
Which of the following is not a characteristic of a chemical change?
What do you understand by 'chemical reaction'?
What do you observe when Cobalt chloride paper is introduced in water vapour.
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
Analogy:
H2O: Water:: NaCl: ______.
Is the conversion of milk into ice cream a chemical change?
Write the equation for the process of formation of rust.
