1.

Element X is a metal with a valency 2. 
Element Y is a non-metal with a valency 3. 

If the compound formed between X and Y is melted and an electric current passed through the molten compound, the element X will be obtained at the (1).............. and Y at the (2) ........... of the electrolytic cell ( provide missing words.) 

Fill in the blanks with suitable words:-

Prismatic and plastic sulphur are two ............. of sulphur. Both are insoluble in water. Prismatic sulphur is soluble in a volatile liquid named ............while plastic sulphur is insoluble in it. Prismatic sulphur is.............. is structure whereas plastic sulphur is ................

What kind of particles will be found in liquid compounds which are a non-electrolyte ? 

To protect iron from rusting it is coated with a thin layer of zinc. Name this process.

Name a non-metal that has a metallic lustre and sublimes on heating.

Predict the group of an element X if its atomic number is 16.

X, Y and Z are three crystalline solid which is soluble in water and have a common anion to help you to identify X, Y and Z, you are provided with the following experiment observation. Copy and complete the corresponding inferences in (i) to (iv).

A reddish -brown gas is obtained when X, Y and Z, are separately warmed with concentrated sulphuric acid and copper turnings added to the mixture.

INFERENCE: 1 The common anion is the .............ion 

X, Y and Z are three crystalline solid which is soluble in water and have a common anion to help you to identify X, Y and Z, you are provided with the following experiment observation. Copy and complete the corresponding inferences in (i) to (iv).

When X is heated, it melts and gives off only one gas which relight a glowing splint. 
The action of heat on y produces a reddish -brown gas and a yellow residue  which fuses with the glass of the test tube.

INFERENCE3: The metal ion present in Y is the .............. ion 

X, Y and Z are three crystalline solid which is soluble in water and have a common anion to help you to identify X, Y and Z, you are provided with the following experiment observation. Copy and complete the corresponding inferences in (i) to (iv).

When Z is heated it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue

INFERENCE 4: Z contains the ..................cation.

Element X is a metal with a valency 2. 
Element Y is a non-metal with a valency 3. 

Write equations to show how X and Y form ions.