The scum formed when soap is mixed with hard water could be
calcium trioxocarbonate (IV)
propane- 1, 2, 3 - triol
calcium hydrogentrioxocarbonate (IV)
magnesium tetraoxosulphate (IV)
calcium stearate
Correct answer is A
No explanation has been provided for this answer.
The halide used widely in photography is
ammonium chloride
calcum chloride
silver bromide
sodium brmide
aluminium fluroide
Correct answer is C
No explanation has been provided for this answer.
The equilibrium price of rice is the price at which
Its demand exceeds supply
Its supply exceeds demand
Its supply equals demand
Consumers cannot buy the quality they want
Correct answer is C
No explanation has been provided for this answer.
When air is passed through potash and then pyrogallol, the components are noble gases
oxygen and carbon (IV) oxide
oxygen and nitrogen
nitrogen and water vapour
water vapour and carbon (IV) oxide
oxygen and water vapour
Correct answer is C
No explanation has been provided for this answer.
The reactions ethyne are mainly
substitution reactions
addition reactions
addition polymerization
catalytic hydrogenation
catalytic halogenation
Correct answer is B
No explanation has been provided for this answer.