English Medium कक्षा १० - CBSE Question Bank Solutions for Science

What type of reaction is represented by the following equation?

Mg + CuSO₄ → MgSO₄ + Cu

What is meant by displacement reaction, Explain with help of one example.

What happens when a piece of iron metal is placed in copper sulphate solution? Name the type of reaction involved.

What happens when a zinc strip is dipped into a copper sulphate solution?
Write the equation for the reaction that takes place.

What happens when a zinc strip is dipped into a copper sulphate solution?
Name the type of reaction involved.

A strip of metal X is dipped in a blue coloured salt solution YSO₄. After some time, a layer of metal Y from the salt solution is formed on the surface of metal strip X. Metal X is used in galvanisation whereas metal Y is used in making electric wires. Metal X and metal Y together form an alloy Z.
(a) What could metal X be?
(b) What could metal Y be?
(c) Name the metal salt YSO₄.
(d) What type of chemical reaction takes place when metal X reacts with salt solution YSO₄? Write the equation of the chemical reaction involved.
(e) Name the alloy Z.

When a black metal compound XO is heated with a colourless gas Y₂, then metal X and another compound Y₂O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y₂ can be prepared by the action of a dilute acid on any active metal. The compound Y₂O is a liquid at room temperature which can turn anhydrous copper sulphate blue.
(a) What do you think is metal X?
(b) What could be gas Y₂?
(c) What is compound XO?
(d) What is compound Y₂O?
(e) Write the chemical equation of the reaction which takes place on heating XO with Y₂.
(f) What type of chemical reaction is illustrated in the above equation?

When a strip of red-brown metal X is placed in a colourless salt solution YNO₃ then metal Y is set free and a blue coloured salt solution X(NO₃)₂ is formed. The liberated metal Y forms a shining white deposit on the strip of metal X.
(a) What do you think metal X is?
(b) Name the salt YNO₃.
(c) What could be metal Y?
(d) Name the salt X(NO₃)₂.
(e) What type of reaction takes place between metal X and salt solution YNO₃?

Which of the following molecule is called buckministerfullerene?
C₉₀ C₆₀ C₇₀ C₁₂₀

What is the general name of all the compounds made up of carbon and hydrogen?

The colour of an aqueous solution of zinc sulphate as observed in the laboratory is:

(1) Green 

(2) Yellow 

(3) Blue 

(4) Colourless

To show that zinc is a more active metal than copper, the correct procedure is to: 

(1) add dilute nitric acid on strips of both the metals. 

(2) observe transmission of heat through strips of zinc and copper. 

(3) prepare solution of zinc sulphate and hang strip of copper into it. 

(4) prepare solution of copper sulphate and hang strip of zinc into it. 

State two characteristic features of carbon which when put together give rise to a large number of carbon compounds.

Explain the ways in which glucose is broken down in absence or shortage of oxygen. 

What is hydrocarbon? Give its one example. 

Give the structural difference between saturated and unsaturated hydrocarbons with two examples each.