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