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प्रश्न
Name: Gas with rotten egg smell.
उत्तर
Hydrogen sulphide.
H2S
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Define precipitation.
FILL IN THE BLANK
A .............. change is a temporary change.
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Is kerosene an electrolyte or a non-electrolyte ?
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
When electric current is passed through acidulated water ______ of water takes place.
Define Electrochemical reaction
Give an example
What is a chemical change? Give two examples of chemical change?
Name: Two carbonates do not produce carbon dioxide on heating.
Give a chemical test to distinguish between the following gases.
H2 and CO2
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
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 coloured substance which leaves a black residue and evolves two gases one of which is acidic and coloured and the other neutral and colourless.
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
________ is a chemical substance which alters the speed of a chemical reaction.
The percentage composition of Nitrogen in Ureas is ______.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
