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