English Medium कक्षा १० - CBSE Question Bank Solutions

Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?

Bronze is an alloy of ______.

No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D, floats over it. It was observed that the reaction is highly exothermic.

(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.

(ii) Mention any two types of reactions under which above chemical reaction can be classified.

What is ‘rusting’?

Answer the following question.

List two properties of alloys.

Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.

Amalgam is an alloy of ____________.

Copper objects lose their shine and form green coating of ____________.

Which among the following alloys contain mercury as one of its constituents?

The diagram shows the reaction between metal and dil. acid.

What is the reason for different behaviour of Mg in test tube B?

The table shown below gives information about four substances: A, B, C and D.

Identify Ionic compounds from the above given substances.

Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

The substance not likely to contain CaCO₃ is:

Identify the correct statement from the following:

Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?

Write the full form of the following as it occur in biology :
AIDS

Which of the following diseases is not sexually transmitted? 

AIDS is a sexually transmitted disease caused due to an infection by a ______