English Medium इयत्ता १० - CBSE Question Bank Solutions for Science

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.

What are decomposers? What will be the consequence if the decomposers are completely eradicated from an ecosystem? Give justification in support of your answer.

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.

List two differences between the properties exhibited by covalent compounds and ionic compounds.

Which of the following is the purest form of carbon?

Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?

A	B
C	D

Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?

A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light ______.

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

When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula ______.

The correct structural formula of butanoic acid is -

Acetic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y was evolved. The gas was passed through lime water, which turned milky. It was concluded that ______.

Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g., hydrogen. After the formation of four bonds, carbon attains the electronic configuration of ______.

Which of the following statements are usually correct for carbon compounds? These

1. are good conductors of electricity
2. are poor conductors of electricity
3. have strong forces of attraction between their molecules
4. do not have strong forces of attraction between their molecules.

The longest fibre on the cell body of a neuron is called ____________.

Which nerves transmit impulses from the central nervous system towards muscle cells?

A microscopic gap between a pair of adjacent neurons over which nerve impulses pass is called ____________.

Which part of a nerve cell contains a nucleus?

Cation is formed when ______.