Advertisements
Advertisements
प्रश्न
______ gas causes tears in our eyes while cutting onions.
Advertisements
उत्तर
Propanethial s-oxide gas causes tears in our eyes while cutting onions.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Write true or false :
No new substance is formed during a chemical reaction.
Copper carbonate when heated, it turns :
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
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.
What is a chemical reaction?
What do you observe? When
Water is added to the quick lime.
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
|
|
Shake the gas with red litmus solution |
||||
|
Shake the gas with blue litmus solution |
||||
|
Apply a burning splint to a gas |
What do you observe when H2S is passed through a lead nitrate solution.
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
Which of the following is a chemical change?
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
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?
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
We are advised to not to play with fireworks. Give reason.
