Give the common name for the following compound (CH\(_{3}\))\(_{2}\) CH CH\(_{2}\) -Br
คำตอบ
(A)
Isobutyl bromide
2
The enzyme that converts glucose to ethyl alcohol is?
คำตอบ
(B)
zymase
3
The scientist who stated that matter can be converted into energy is?
คำตอบ
(D)
Einstein
4
What is the IUPAC name for the following compound? HC\(\equiv\)CCH\(_{3}\)
คำตอบ
(B)
Methyl acetylene
5
What is the chemical name for the compound CuCO\(_{3}\)?
คำตอบ
(B)
Copper (ii) carbonate
6
A 'breath test' used by traffic police to check drunken driving uses?
คำตอบ
(D)
Potassium dichromatic-sulphuric acid
7
Which one of the following is not a mixture?
คำตอบ
(B)
Mercury
8
Which of the following is a non-metal that remains liquid at room temperature?
คำตอบ
(C)
Bromine
9
Which of the following are chemical changes?
I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up
คำตอบ
(A)
I and II
10
The atomic weight of nitrogen is?
คำตอบ
(C)
14
11
The gas which causes global warming is?
คำตอบ
(B)
CO\(_{2}\)
12
Oxygen is absent in?
คำตอบ
(A)
Kerosene
13
A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?
คำตอบ
(A)
Sublimation
14
The maximum electron in N shell is?
คำตอบ
(D)
32
15
Neutrons were discovered by?
คำตอบ
(A)
James Chadwick
16
Which of the following is a form of calcium carbonate?
I. limestone
II. marble
III. chalk
Iv. egg-shells
คำตอบ
(D)
I, II, III, and IV
17
Soaps clean surfaces on the principle based on?
คำตอบ
(D)
surface tension
18
The reactivity of fluorine is due to?
คำตอบ
(A)
its high electro negativity
19
The mass number of a nucleus is?
คำตอบ
(B)
The sum of the number of protons and neutrons present in the nucleus
20
The mass of one Avogadro number of helium atoms is?
คำตอบ
(B)
4.00gram
21
220g of carbon dioxide contains ----- moles
คำตอบ
(A)
5
22
The inherited traits of an organism are controlled by?
คำตอบ
(C)
DNA molecules
23
The most abundant rare gas in the atmosphere is?
คำตอบ
(C)
Ar
24
The heat required to raise the temperature of the body by 1k is called?
คำตอบ
(B)
Thermal capacity
25
The nucleus of a hydrogen atom consist of a?
คำตอบ
(A)
1 proton only
26
The metal used to recover copper from a solution of copper sulphate is?
คำตอบ
(D)
Fe
27
The nucleus of an atom consists of?
คำตอบ
(C)
Protons and neutrons
28
A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage
คำตอบ
(C)
10%
29
The only metal that is anti-bacterial is?
คำตอบ
(D)
Copper
30
An element having the atomic number 17 will resemble which of the following elements having atomic number as given below?
คำตอบ
(B)
35
31
A chemical process in which there is a gain of electrons is known as?
คำตอบ
(B)
Reduction
32
The reactions involving simultaneous oxidation and reduction?
คำตอบ
(D)
Redox reactions
33
A binary compound of oxygen with another element is referred to as?
คำตอบ
(A)
Oxide
34
The process or act of extracting a metal from its ore and refining it is called?
คำตอบ
(C)
Mettallurgy
35
The compounds made up of only carbon and hydrogen are called?
