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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
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 :
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
The number of electrons a carbon atom requires to attain an octet configuration is __________.
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
Atoms like oxygen and chlorine ________ the electrons to form stable molecules such as O2 and Cl2
Presence of two electrons in valence shell of atom of element is called _________ configuration
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
Acids, which are soluble in water
Acids, which are insoluble in water
Bases, which are insoluble in water
Bases, which are soluble in water
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)
Sodium hydroxide is a
A metallic oxide which is amphoteric in nature :
Colour of the precipitate formed on adding NH4OH solution to copper (II) sulphate solution is
A chloride soluble in hot water but insoluble in cold water
Dirty green precipitate insoluble in sodium hydroxide are :
What is the empirical formula of Butane [ C4 H10 ]
Twice of vapour density gives us :
Actual vapour density
Relative vapour density
If empirical formula of an organic compound is CH2O then its molecular formula can be
A compound with empirical formula AB2 has the vapour density equal to its empirical formula weight. Find its molecular formula ?
Pure metal is made __________ during electrorefining.
None of the above
Electrolyte used for electroplating with nickel is :
The particles present in sodium hydroxide solution are
Ions and molecules
All of these
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
The ion which could be discharged most readily during electrolysis .
The metallic electrode which does not take part in an electrolytic reaction.
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
Among the elements given below , the element with the least electronegativity is
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
Compound X consists of molecules , The type of bonding in X wil be :
A compound which contains all the three types of bonds i.e, ionic, covalent and co – ordinate is :
A compound having one lone pair of electrons :
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 ?
A salt formed by the partial replacement of the ionisable hydrogen atoms of a polybasic acid by a metal
The acid which contains four hydrogen atoms
The ion formed when an acid dissolves in water
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 ?
Is a halogen ?
Is an element with valency 4 ?
Is an alkali metal
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
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