English Medium इयत्ता १० - CBSE Question Bank Solutions for Science

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.

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.

1 g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name and the color of the products formed in each case.

What is thermit process?

Name the substance that is getting oxidised in the thermit process.

Answer the following question.
Identify the acid and the base from which sodium chloride is obtained. Which type of salt is it? When is it called rock salt? How is rock salt formed?

Answer the following question.

What are plant hormones? Name the plant hormones responsible for the following:

1. Growth of stem
2. Promotion of cell division
3. Inhibition of growth
4. Elongation of cells

Write the name and molecular formula of a carbon compound having its name suffixed with "-ol" and having two carbon atoms in its molecule. With the help of a chemical equation indicate what happens when this compound is heated with excess conc. H₂SO₄.

When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.

What is the colour of this precipitate? Name the compound precipitated.

When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.

Write the balanced chemical equation for this reaction.

A student mixes sodium sulphate powder in barium chloride powder. What change would the student observe on mixing the two powders? Justify your answer and explain how he can obtain the desired change.

Two acids ‘A’ and ‘B’ are given. Acid A gives one hydrogen ion per molecule of the acid in solution. Acid B gives two hydrogen ions per molecule of the acid in solution.

1. Find out acid A and acid B.
2. Which acid is called the King of Chemicals?

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(i) Temperature of the solution decreases.

(ii) Temperature of the solution increases.

(iii) Temperature of the solution remains the same.

(iv) Salt formation takes place.

Which of the following statements is true for acids?

Reema took 5ml of Lead Nitrate solution in a beaker and added approximately 4ml of Potassium Iodide solution to it. What would she observe?

Plants like banana, rose, jasmine, orange have lost the capacity to produce ______ 

The part of the flower which is present in the centre of the flower is ______ 

In the following Figure, parts A, B, and C are sequentially 

In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Variation is high in sexually reproducing organisms compared to asexually reproducing organisms.

Reason: Inaccuracies during DN A copying give rise to variation.

Which of the following is not a physical change?