An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is
16
15
31
46
Correct answer is B
No explanation has been provided for this answer.
An example of a solid emulsion is
Butter
Hair cream
Milk
Cod-liver oil
Correct answer is A
No explanation has been provided for this answer.
Blue
Red
Orange
Purple
Correct answer is D
Neutral litmus paper is purple. the result of a neutralization reaction is salt and water and hence is neutral.
In the extraction of iron, the waste gas from the furnace is a mixture of
PH3 CO and CO2
CO and C
N2 , CO and CO2
PH3 and CO
Correct answer is C
the \(N_2\) from the hot air blast to burn the coke (48%), the \(CO\) (23%) and \(CO_2\) (21%) produced from the reduction of the iron ore \(Fe_{2}O_{3}\) by carbon (the coke) are the major components of the waste from the extraction.
The arrangement of particles in crystal lattices can be studied using
X-rays
\(\beta\)-rays
\(\alpha\)-rays
\(\gamma\)-rays
Correct answer is A
No explanation has been provided for this answer.