Advertisements
Advertisements
प्रश्न
Write true or false :
No new substance is formed during a chemical reaction.
विकल्प
True
False
Advertisements
उत्तर
False
APPEARS IN
संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
How do the following help in bringing about a chemical change?
light.
How do the following help in bringing about a chemical change?
catalyst .
Complete and balance the following chemical equations:
N2 + O2 →
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Give reason.
Acidic soil is treated with quick lime.
Define chemical reaction.
Explain the following reaction with one suitable example of Decomposition reaction
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Name the gases which turn moist red litmus blue.
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Analogy:
H2O: Water:: NaCl: ______.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
Galvanization is a process in which ______ is coated as a layer of iron.
Write the equation for the process of formation of rust.
Both CO2 and H2 gases are ______.
______ is a chemical substance is used in whitewashing.
