The number of electrons a carbon atom requires to attain an octet configuration is __________.

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 ?

Alkalis are

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

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 :

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.

Electrolyte used for electroplating with nickel is :

The particles present in sodium hydroxide solution are

The observation seen when fused lead bromide is electrolysed is :

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 ?

Among the elements given below , the element with the least electronegativity is

Ionisation potential increases over a period from left to right because the :

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

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