Science chapter 1 CLASS 10th
Which change is seen in cooking of food?
Chemical
Physical
Neutral
None of the above
Zn + CO --------> ZnCO3. Identify the type of reaction.
Combination
Decomposition
Thermal decomposition
Displacement
AMg + O2 --------->MgO .only write the value of a. *In this question, you only have to write the value of a such as like your answer is 3, so in the answer only write 3 , not any statement.*
What do you understand by rusting?
It is the corrosion of iron
It requires water and air
It provides brown color on copper objects
A and b
All of the above
In the electrolysis, which gas is liberated at anode?
Hydrogen
Sulphur
Oxygen
H2O
Which gas is filled in chips packet and why?
Oxygen gas, to prevent rancidity
Nitrogen gas, to prevent rancidity
Nitrogen gas, to help in rancidity
Oxygen gas, to help in rancidity
How can you differentiate Copper sulphate with ferrous sulphate?
Cooper sulphate is solid while ferrous sulphate is liquid.
Copper sulphate is green while ferrous sulphate is blue
Coper sulphate is blue while ferrous sulphate is green
Copper sulphate is liquid while ferrous sulphate is solid.
How can you test sulphur gas?
By burning it
By bringing match stick to it
By drinking it
By smelling it
ZnO + Cu ------> CuO + Zn. Identify the reducing and oxidising agent respectively.
ZnO and Cu
Cu and ZnO
CuO and Zn
Zn and CuO
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