ICSE Class 10 Chemistry Solved Question Paper 2004

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 ................

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

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 

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

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.

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 

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.) 

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

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.

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