1) Which one of the following is not an element of Noble gases?
a) Helium
b) Neon
c) Xenon
d) Hydrogen
Ans: d
2) Mole is defined as the number of atoms found in ___ of carbon-12?
a) 11 grams
b) 14 grams
c) 10 grams
d) 12 grams
Ans: d
3) Which one of the following is not a mixture?
a) Steel
b) Aluminum
c) Graphite
d) Glass
Ans: c
4) Alloys are ____.
a) harder than the pure metal
b) harder than the impure metal
c) Softer than the pure metal
d) Softer than the impure metal
Ans: c
5) What is the name of that process in which oxygen is removed?
a) Oxidation
b) Electrolysis
c) Ionization
d) Reduction
Ans: d
6) Rusting is an ___ reaction.
a) Ionization
b) Oxidation
c) Reduction
\ d) None of the above
Ans: b
7) What is needed for rusting to occur?
a) Water
b) Oxygen
c) Water & oxygen
d) Carbon dioxide
Ans: c
8) All acids are____.
a) Corrosive when they are strong
b) Corrosive when they are weak
c) Irritant when they are strong
d) None of the above
Ans: a
9) When an acid reacts with a metal carbonate, the products formed are ___.
a) Salt, Water, and carbon dioxide
b) Salt & water
c) Water & Carbon dioxide
d) Salt & carbon dioxide
Ans: a
10) Which one is an alkaline among the following?
a) Vinegar
b) Saliva
c) Ammonia
d) Acid rain
Ans: c
11) In the periodic table, elements are arranged according to their____.
a) Mass number
b) Atomic and mass number
c) Atomic number
d) None of the above
Ans: c
12) What is an isotope?
a) Atoms of an element having a different mass number
b) Atoms of an element having the same mass number
c) Atoms of an element having a different atomic number
d) Atoms of an element having the same atomic number
Ans: a
13) The atomic number is represented by which letter?
a) A
b) M
c) X
d) Z
Ans: d
14) Which science is sometimes called central science?
a) Physics
b) Chemistry
c) Biology
d) Geology
Ans: b
15) Which acid is used in the body to help digestion?
a) Hydrochloric acid
b) Sulphuric acid
c) Acetic acid
d) Boric Acid
Ans: a
16) Which of the following was to be discovered first in the chromospheres of the sun?
a) Krypton
b) Xenon
c) Neon
d) Helium
Ans: d
17) From which mineral is radium obtained?
a) Rutile
b) Haematite
c) Limestone
d) Pitchblende
Ans: d
18) Which of the following are the ingredients of gunmetall?
a) iron, zinc, Titanium
b) Iron, tin
c) iron, Brass, Tin
d) Copper, Tin
Ans: d
19) Sodium metal is kept under___.
a) Petrol
b) alcohol
c) Water
d) Kerosene
Ans: d
20) Which of the following is in liquid form at room temperature?
a) Lithium
b) Sodium
c) Francium
d) Cerium
Ans: c
21) Potasium nitrate is used in___.
a) medicine
b) fertilizer
c) salt
d) glass
Ans: b
22) Permanent hardness of water may be removed by the addition of
a) sodium carbonate
b) alum
c) potasium permanganate
d) lime
Ans: a
23) Sodium water contains
a) carbonic acid
b) sulphuric acid
c) carbonic dioxide
d) nitrous acid
Ans: c
24) The most important ore of aluminium is
a) galena
b) calamine
c) calcite
d) bauxite
Ans: d
25) Most soluble in water is
a) camphor
b) sulfur
c) common salt
d) sugar
Ans: d
26) Most soluble in water is
a) camphor
b) sulphur
c) common salt
d) sugar
Ans: d
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