English Medium Class 10 - CBSE Question Bank Solutions

Complete the following equation:

CH₂ + H₅OH `("Hot Conc." H_2SO_4)/`>

Complete the following equation:

CH₃COOH + NaOH → 

Write the name and formula of a molecule made up of three atoms of oxygen.

A student weighed some raisins and recorded the weight as ‘x’. She then soaked the raisins in distilled water. After about 2 hours she removed the raisins, wiped them dry and weighed them again, and recorded that as ‘y’. The percentage of water absorbed by raisins may be determined using the relationship.

In the experiment for determining the percentage of water absorbed by raisins, we do the final weighing of the raisins after keeping them dipped in water for about one hour. For the accuracy of the result, the extra water from the surface of the soaked raisins is removed by

Out of HCl and CH₃COOH, which one is a weak acid and why? Describe an activity to support your answer.

To determine the percentage of water absorbed by raisins, raisins are soaked in water for: 

Raisins are wiped off gently before final weighing with the help of

The step(s) necessary for determining the percentage of water absorbed by raisins is/are:

In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode?

Distinguish between ionic and covalent compounds under the following properties:

(i) Strength of forces between constituent elements

(ii) Solubility of compounds in water

(iii) Electrical conduction in substances

Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines.

Show the formation of Na2O by the transfer of electrons. 

Out of three metals P, Q and R, P is less reactive than Q and R is more reactive than P and Q both. Suggest an activity to arragne P, Q and R in order of their decreasing reactivity. 

Identify the type of reaction taking place of the following case and write the balanced chemical equation of the reaction:
Zinc reacts with silver nitrate to produce zinc nitrate and silver.

Identify the type of reaction taking place of the following case and write the balanced chemical equation of the reaction:
Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide.

Explain the following: 

Reactivity of aluminium decrease if it is dipped in nitric acid.

Answer the following question.
What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds:
(i) poor conductors of electricity? and  
(ii) have low melting and boiling points? What happens when this compound burns in oxygen?

Answer the following question.
What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write a chemical equation for the reaction involved.