rbonates of Na and K
rbonates of Ca and Mg
C:-Chlorides and sulphates of Ca and Mg
D:-Chlorides and sulphates of Na and K
Correct Answer:- Option-C
Question39:-Role of a catalyst in a chemical reaction is
A:-To decrease activation energy
B:-To increase activation energy
C:-To increase heat of reaction
D:-To decrease heat of reaction
Correct Answer:- Option-A
Question40:-Characteristics of transition element
A:-Show variable oxidation state
B:-Forms alloys
C:-Form coloured compounds
D:-All the above
Correct Answer:- Option-D
Question41:-In [*"Ni(CO)_4"" ], the oxidation number of Nickel is
ಹಡತ
B:-+2
6+4
D:-Zero
Correct Answer:- Option-D
Question42:-Primary, secondary and tertiary amines வா be distinguished by Hinsberg reagent, which ‏کا‎
‎A:-Benzoyl chloride
B:-Benzene sulphonyl chloride
C:-Acetic anhydride
D:-Benzyl chloride
Correct Answer:- Option-B
Question43:-The monomer of PVC is
A:-Ethene
B:-Vinyl chloride
C:-Styrene
D:-Tetra Fluoro ethane
Correct Answer:- Option-B
Question44:-Tyndall effect is
A:-Scattering of light by colloidal particle
B:-Refraction of light by colloidal particle
C:-Absorption of light by colloidal particle
D:-Reflection of light by colloidal particle
Correct Answer:- Option-A
Question45:-Which of the following battery is used in automobiles?
el-cadmium cell
:-` 1 2-0 2" ലി ലി
C:-Lead storage battery
D:-Mercury ‏الى‎
‎Correct Answer:- Option-C
Question46:-Emulsion is an example of colloidal system of
A:-liquid dispersed in 985
B:-Solid dispersed in gas
C:-Liquid dispersed in liquid
D:-Liquid dispersed in solid
Correct Answer:- Option-C
Question47:-The volume of 1 mol of gas at STP is
‏اده 22.4-:ھ‎
B:-22.4 L
C:-2.24 ml
D:-2.24L
Correct Answer:- Option-B