Chemistry MCQS for Class 10 Chapter 4

10th Class Chemistry MCQS
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Hydrogenation of vegetable oil to convert it into banaspatic ghee is carried out in the presence of catalyst:
Na – Metal
Zn-metal
Ni-metal
Fe2O3

Chemical formula of chloroform.
CHCl2
CH3Cl
CCl4
CH2O2

The molecular formula of the first three members of the alkane hydrocarbons are CH4,C2H6 and C3H8. What is the molecular formula for the eight alkane member, octane, which is found is petrol?
C8H8
C8H16
C8H20
C8H18

Chemical formula of chloroform is :
CCl4
CH2Cl2
CH3Cl
CHCl3

Dichloromethane reacts with halogens in the presence of diffused sun light and produces
Chloromethane
No reaction
Chloroform
Carbon tetrachloride

Traces of acetylene are present to coal gas about.
0.08%
1.10%
0.06%
90%

The order or reactivity of hydrogen halides with alkenes is.
HCl > HBr
HBr>HCl
HBr > HI
HI/Br

Dehydration means removal of.
Halogen
Hydrogen
Water
All above.

Dehydrohalogenation of vicinal-dihalides take place in the presence of.
None of these
NaOH
KOH
NaCl

Dehydration of alcohols can be carried out with.
KOH
H2SO4
HCl
NaOH

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