Advertisements
Advertisements
प्रश्न
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
विकल्प
True
False
Advertisements
उत्तर
False
APPEARS IN
संबंधित प्रश्न
How would you show that setting of curd is a chemical change?
How do the following help in bringing about a chemical change?
catalyst .
Define catalyst.
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
What are biocatalysts ?
Fill in the blank
A new substance is always formed in a _______ change.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Complete the statement by filling the gap using an 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)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
What do you observe? When
Water is added to the quick lime.
Complete and balance the following reaction:
Pb(NO3)2 + KI →
Complete the table given below.
| Heat on copper carbonate | Test for gas evolved |
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
What changes do you expect?
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
Which is used as a catalyst during the process of hydrogenation of oils?
Write the equation for the process of formation of rust.
Give an example where heat, light, and sound are produced during a chemical change.
How can we prevent rusting?
