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