An oxidation state of Cr in K2Cr2O7
7
6
5
4
Correct answer is B
The oxidation state of K2Cr2O7 is +6. option A,C,D are the oxidation state of other elements like O7,C14, etc.
\(+2 + 2x + (-2\times7) =0\)
\(2x=12\)
\(x = +6\)
CH2O
C3H6O3
C6H12O6
C6H12O3
Correct answer is C
C = 40%, 40/12 = 3.33
H = 6.7%, 6.7/1 = 6.7
O = 53.3%, 53.3/16 = 3.33
C = 3.33/3.33 = 1
H = 6.7/3.33 = 2
O = 3.33/3.33 = 1
(CH2O)n = 180
(12 + 2 + 16)n = 180
30n = 180
n = 6
= C6H12O6
The energy value of petrol can be determined by
Bomb calorimeter
Catalytic cracker
Fractionating column
Thermometer
Correct answer is C
Fractionating column contains petrol with different densities.
The basic particles from which matter could be made up of are as follow, except?
Salt
Atom
Ion
Molecule
Correct answer is A
Salt is a chemical used for varieties of purposes, so it’s not part of matter, Atom being the smallest part of molecule and ion are charge which are part of matter
The number of isomers formed by C6H14 is
4
5
2
3
Correct answer is B
The number of isomers C6H14 cm is 5. it will not form options A,C, D