some CuO was reacted with excess dilute H2SO4
the solution was concentrated
when the concentrate was cooled, crystals formed were removed by filtration
the crystals were washed with very little cold water
the crystals were then allowed to dry
Correct answer is A
No explanation has been provided for this answer.
SO2 and NH3
CO2 and H2
NO2 and SO3
SO3 and NO
CO and H2
Correct answer is C
No explanation has been provided for this answer.
Which volume of 0.5 M H 2SO4 will exactly neutralize 20 cm 3 of 0.1 M NaOH solution?
2.0 cm 3
5.0 cm 3
6.8 cm 3
8.3 cm 3
10.4 cm 3
Correct answer is A
CAVACbVb=12
frac0.5×VA0.1×20=12
V_A = \frac{0.1 \times 20}{2 \times 0.5} = \frac{1.0}{0.5)
= 2cm2
Stainless steel is an alloy of
carbon, iron and lead
carbon, iron and chromium
carbon, iron and copper
carbon, iron and silver
carbon and iron only
Correct answer is B
No explanation has been provided for this answer.