Solved Chemistry MCQS Set 2

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Solved Chemistry MCQS


In which molecule carbon atom is sp2hybridized
CH4
None of the above
C2H2
C2H4

Which of the following units represents largest amount of energy?
Erg
Electron vol.
Joule
Calorie

Which of the following pairs are chemically dissimilar?
Zr and Hf
Ca and Zn
Ba and Sr
Na and K

The heat evolved in combustion of rhombic and monoclinic sulphur are -70960 and -71030 cal mol-1respectively. What will be heat of conversion of rhombic sulphur to monoclinic?
+70 calories
70960 calories
71030 calories
-70 calories

Chief air pollutant which is likely to deplete ozone layer
Carbon dioxide
Nitrogen oxides and chloro flrorocarbons
Suphure dioxide
Carbon dioxide

Which of the following mineral does not contain Al?
Mica
Cryolite
Feldspar
Fluorspar

Iron, once dipped in concentrated H2SO4, does not displace copper from copper sulphates solution, because
It is less reactive than copper
All valence electrons of iron are consumed.
An inert layer of iron oxide is deposited on it.
A layer of sulphates is deposited on it

1 mole of CH4contains
4 g-atom of hydrogen
3.0 g of carbon
1.81 x 1023molecules of CH4
6.02 x 1023atoms of H

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution?
31.8 gm
12.7 gm
15.9 gm
63.5 gm

Which one of the following has the lowest boiling point?
Al
Ga
Ti
B

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