The reaction of halogens with alkanes in the presence of sunlight is an example of
oxidation reaction
addition reaction
hydrogenation reaction
substitution reaction
Correct answer is D
Alkanes undergoes substitution reaction and it is an example of halogenation substitution reaction.
Reaction of halogen with alkane in the presence of sunlight (ultraviolet) is termed halogenation. Halogenation is an example of substitution reaction. In addition, alkanes only undergo substitution reaction but not addition reaction.
0.05
10.80
10.00
0.10
Correct answer is D
m = \(\frac{Mm \times Q}{96500n
}\)
where Q = IT
M = Mm × \(\frac{Q}{96500n}\)
where m = mass
Mm = Molar mass
Q = Quantity of electricity
n = number of change= +1
\(\frac{M}{Mm}\) = mole = \(\frac{mass}{Molarmass}\)
\(\frac{M}{Mm}\) = \(\frac{Q}{96500n}\)
= \(\frac{9650}{96500n}\) × 1
= \(\frac{1}{10}\) = 0.1mol
Tin is unaffected by air at ordinary temperature due to its?
Low melting point
Weak electropositive character
High boiling point
White lustrous appearance
Correct answer is A
Tin has a melting point of 232° which enables it to be unaffected by air at ordinary temperature coupled with the fact that it also helps in making a good metal for alloying.
Tin is relatively unaffected by both water and oxygen at room temperature due to its low melting point. It does not rust, corrode, or react in any other way. This explains one of its major uses: as a coating to protect other metals.
54.0g
27.0g
13.5g
108.0gQ
Correct answer is A
Recall that
mass deposited = \(\frac{MmIt}{96500n}\)
Mm =108, t = 4830s
I = 10A, n = 1
m = 108 × 10 × (\(\frac{4830}{96500}\)) × 1
m = 54.0g
The shape of ammonia molecules is
trigonal planar
octahedral
square planar
tetrahedral
Correct answer is A
Ammonia = NH3
It has three bonds of hydrogen to the Nitrogen.