1. Atomicity of phosphorous is __________ a) 2b) 3c) 4d) 52. Copper are is concentrated

1. Atomicity of phosphorous is __________
a) 2
b) 3
c) 4
d) 5
2. Copper are is concentrated by ___________ process.
a) Hydraulic
b) Magnetic separation
c) froth floatation
d) chemical process
3. _________ alloy is used to make automobile parts.
a) duralumin
b) stainless steel
c) Nickel steel
d) Magnalium
4. Select the Epsom salt
a) MgSO4. 7H2O
b) CaSO4. 2H2O
c) CuSo4. 5H2O
d) ZnSO4. 7H2O​

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