Which of the following gases is not acidic?
\(SO_{3}\)
\(NO_{2}\)
\(Co_{2}\)
CO
Correct answer is D
The compound CO is treated as a neutral oxide, though in truth, it is slightly acidic. Regardless of this, within the options supplied, CO is the best option available.
When Magnesium reacts with oxygen, heat is
absorbed and the reaction is endothermic
evolved and the reaction is endothermic
evolved and the reaction is exothermic
absorbed and the reaction is exothermic
Correct answer is C
The Magnesium actually reacts with oxygen in the air, is burnt and produces a bright light. The bright light emits a lot of heat so the reaction is exothermic.
\(2.5\times 10^{23}\)
\(1.5\times 10^{23}\)
\(1.5\times 10^{24}\)
\(2.5\times 10^{24}\)
Correct answer is C
1 mole = \(6.02 \times 10^{23}\)
2.5 moles = \(6.02 \times 10^{23} \times 2.5\)
= \(15.05 \times 10^{23} = 1.505 \times 10^{24}\)
\(\approxeq 1.5 \times 10^{24}\)
In a saturated solution at a given temperature, the undissolved solutes are in equilibrium with
the solvent
dissolved solute particles
the saturated solution
insoluble solute particles
Correct answer is C
A solution that is in equilibrium with undissolved solute is said to be saturated.
Graphite and Diamond are similar in that they
have octahedral shape
have same density
form carbon(IV) oxide on combustion
conduct electricity
Correct answer is C
A diamond is pure carbon. Graphite is pure carbon. Both will burn to form carbon dioxide.