1 ) An
electrochemical cell consists of . . . . . . . half cells .
A ) two , B
) three ,
C ) four
, D
) None of these ,
Correct
Answer : - A ) two ,
And each
half cell consists of an electrode and an electrolyte .
2 ) CaCl2
is added to NaCl in Down's cell to
decrease the . . . . . . . . . . . . ,
A )
melting point , B
) boiling point .
C )
freezing point . D
) None of these ,
Correct
Answer : - A ) melting point ,
3 )
Acetone is weakly polar . The attraction between acetone and ion will be weak .
And NaCL has strong bonds , will not dissolve in acetone .
4 ) The
main product of reaction of potassium with oxygen is : - KO2 .
5 ) The
chemical formula for magnesite is : - MgCO3 .
6 )
Catalyst helps in a reaction by increasing rate of reaction .
7 )
Ionization energy of sodium is 496 k J / mole .
8 ) SnCl4
is a covalent compound .
9 )
Hydrides can be classified in . . . . . . . . . . ,
A ) 2
types . B
) 3 types ,
C ) 4
types . D
) none of these ,
Correct
Answer : - B ) 3 types ,
10 )
Alkane and alkynes are unsaturated hydro carbons with at least one double bond
( pi - bond ) . Where as alkane contains only sigma bond . And sigma bond is
stronger than pi bond . So , alkane is less reactive than alkyne and alkenes .
. . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. .
