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प्रश्न
Name: Gas with rotten egg smell.
उत्तर
Hydrogen sulphide.
H2S
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
FILL IN THE BLANK
Positively charged ions are called ........
Write true or false :
No new substance is formed during a chemical reaction.
State the conditions necessary for a chemical change or reaction.
Define the following terms
Precipitate
Give a chemical test to distinguish between the following gases.
HCl and H2S
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
A chemical reaction is often accompanied by external indications or characteristics.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
______ is not a chemical change.
What is the role of a catalyst in a chemical reaction?
Analogy:
H2O: Water:: NaCl: ______.
______ is a natural indicator.
Melting of wax is a change where a solid changes to a liquid state. Give one more such change which you observe in your surroundings
Write a note on the following:
Fermentation
