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- Multiple ChoicePlease save your changes before editing any questions.
An atom of an element has the electronic configuration 2,8,2. To which group does it belong ?
4 Th group
6 Th group
3 rd group
2 nd group
- Multiple ChoicePlease save your changes before editing any questions.
Carbon belongs to the second period and group 14. Silicon belongs to the third period and group 14. If atomic number of carbon is 6, the atomic number of silicon is :
7
14
24
16
- Multiple ChoicePlease save your changes before editing any questions.
Pick out the chemically most reactive elements from the given elements
Li, Na, K, F, Cl, Br
Li and F
Li and Br
K and F
- Multiple ChoicePlease save your changes before editing any questions.
The number of electrons a carbon atom requires to attain an octet configuration is __________.
6
3
2
4
- Multiple ChoicePlease save your changes before editing any questions.
Covalent compounds have __________.
High melting and high boiling points
High boiling and low melting points
. Low boiling and high melting points
Low boiling and low melting points
- Multiple ChoicePlease save your changes before editing any questions.
Atoms like oxygen and chlorine ________ the electrons to form stable molecules such as O2 and Cl2
Donates
Accepts
Shares
Exchanges
- Multiple ChoicePlease save your changes before editing any questions.
Presence of two electrons in valence shell of atom of element is called _________ configuration
Dual
Duplet
Di
Bis
- Multiple ChoicePlease save your changes before editing any questions.
In terms of acidic strength, which one of the following is in the correct increasing order ?
Water ‹ Acetic acid ‹ Hydrochloric acid
Water ‹ Hydrochloric acid ‹ Acetic acid
Acetic acid ‹ water ‹Hydrochloric acid
Hydrochloric acid ‹ water ‹ Acetic acid
- Multiple ChoicePlease save your changes before editing any questions.
Alkalis are
Acids, which are soluble in water
Acids, which are insoluble in water
Bases, which are insoluble in water
Bases, which are soluble in water
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following statements is correct about an aqueous solution of an acid and of a base ?
I. Higher the pH, stronger the acid II. Higher the pH, weaker the acid III. Lower the pH, stronger the base IV. Lower the pH, weaker the base
. (I) and (III)
(II) and (III)
(I) and (IV)
(II) and (IV)
- Multiple ChoicePlease save your changes before editing any questions.
Sodium hydroxide is a
Weak base
Weak acid
Strong base
Strong acid
- Multiple ChoicePlease save your changes before editing any questions.
A metallic oxide which is amphoteric in nature :
ZnO
CaO
Na2O
K2O
- Multiple ChoicePlease save your changes before editing any questions.
Colour of the precipitate formed on adding NH4OH solution to copper (II) sulphate solution is
White
Pale blue
Dirty green
Yellow
- Multiple ChoicePlease save your changes before editing any questions.
A chloride soluble in hot water but insoluble in cold water
ZnCl2
AgCl
PbCl2
BaCl2
- Multiple ChoicePlease save your changes before editing any questions.
Dirty green precipitate insoluble in sodium hydroxide are :
Ferrous hydroxide
Ferric hydroxide
Copper hydroxide
Lead hydroxide
- Multiple ChoicePlease save your changes before editing any questions.
What is the empirical formula of Butane [ C4 H10 ]
CH
C2H5
C2H
C2H4
- Multiple ChoicePlease save your changes before editing any questions.
Twice of vapour density gives us :
Actual vapour density
Relative vapour density
Molecular mass
Molar volume
- Multiple ChoicePlease save your changes before editing any questions.
If empirical formula of an organic compound is CH2O then its molecular formula can be
C2H2O2
. C2H4O
C3H6O
. C6H12O6
- Multiple ChoicePlease save your changes before editing any questions.
A compound with empirical formula AB2 has the vapour density equal to its empirical formula weight. Find its molecular formula ?
AB2
A2B4
A2B
A2B2
- Multiple ChoicePlease save your changes before editing any questions.
Pure metal is made __________ during electrorefining.
Cathode
Anode
Electrolyte
None of the above
- Multiple ChoicePlease save your changes before editing any questions.
Electrolyte used for electroplating with nickel is :
NiCl2
NiSO4
. Ni(OH)2
. NiCO3
- Multiple ChoicePlease save your changes before editing any questions.
The particles present in sodium hydroxide solution are
Only molecules
Ions and molecules
Only ions
All of these
- Multiple ChoicePlease save your changes before editing any questions.
The observation seen when fused lead bromide is electrolysed is :
A silver grey deposit at anode and a reddish brown deposit at cathode
A silver grey deposit at cathode and a reddish brown deposit at a anode
A silver grey deposit at cathode and reddish brown fumes at anode
Silver grey fumes at anode and reddish brown fumes at cathode
- Multiple ChoicePlease save your changes before editing any questions.
The ion which could be discharged most readily during electrolysis .
Fe2+
Cu2+
H +
Al3+
- Multiple ChoicePlease save your changes before editing any questions.
The metallic electrode which does not take part in an electrolytic reaction.
Cu
Ag
Pt
Ni
- Multiple ChoicePlease save your changes before editing any questions.
If an element A belongs to period 3 and group II, then it will have ?
3 shells and 2 valence electrons
2 shells and 3 valence electrons
3 shell and 3 valence electrons
2 shells and 2 valence electrons
- Multiple ChoicePlease save your changes before editing any questions.
Among the elements given below , the element with the least electronegativity is
Lithium
Carbon
Boron
Fluorine
- Multiple ChoicePlease save your changes before editing any questions.
Ionisation potential increases over a period from left to right because the :
Atomic radius increases and nuclear charge increases
Atomic radius decreases and nuclear charge decreases
Atomic radius increases and nuclear charge decreases
Atomic radius decreases and nuclear charge increases
- Multiple ChoicePlease save your changes before editing any questions.
Compound X consists of molecules , The type of bonding in X wil be :
Ionic
Electrovalent
Covalent
Molecular
- Multiple ChoicePlease save your changes before editing any questions.
A compound which contains all the three types of bonds i.e, ionic, covalent and co – ordinate is :
Sodium chloride
Ammonia
Calcium chloride
Ammonium chloride
- Multiple ChoicePlease save your changes before editing any questions.
A compound having one lone pair of electrons :
Water
Methane
Ammonia
Hydrogen sulphide
- Multiple ChoicePlease save your changes before editing any questions.
An element A has electronic arrangement 2,8,2. The element B has electronic configuration 2,8,7. What will be the formula formed between A and B ?
A2B
AB2
AB
A2B7
- Multiple ChoicePlease save your changes before editing any questions.
A salt formed by the partial replacement of the ionisable hydrogen atoms of a polybasic acid by a metal
Acid salt
Normal salt
Basic salt
Complex salt
- Multiple ChoicePlease save your changes before editing any questions.
The acid which contains four hydrogen atoms
Formic acid
Sulphuric acid
Nitric acid
Acetic acid
- Multiple ChoicePlease save your changes before editing any questions.
The ion formed when an acid dissolves in water
Hydroxyl ion
Chloride ion
Hydronium ion
Oxide ion
- Multiple ChoicePlease save your changes before editing any questions.
The question given below refers to the elements of the periodic table with atomic numbers from 3 to 18 . these elements are shown by letters ( not the usual symbol of the elements )
Which of these is a noble gas ?
A
C
J
H
- Multiple ChoicePlease save your changes before editing any questions.
Is a halogen ?
O
F
C
M
- Multiple ChoicePlease save your changes before editing any questions.
Is an element with valency 4 ?
B
D
A
N
- Multiple ChoicePlease save your changes before editing any questions.
Is an alkali metal
G
E
A
K
- Multiple ChoicePlease save your changes before editing any questions.
The arrangement of elements in the modern periodic table is based on their
Increasing atomic mass in the period
Increasing atomic number in the horizontal rows
Increasing atomic number in the vertical columns
Increasing atomic mass in the group
- PollPlease save your changes before editing any questions.
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