English Medium कक्षा १० - CBSE Question Bank Solutions for Science

Write the balanced equation for the following chemical reaction.

\[\ce{Sodium + Water -> Sodium hydroxide + Hydrogen}\]

Give two examples of amphoteric oxides.

Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

What are amphoteric oxides?

Give reason:

Sodium, potassium and lithium are stored under oil.

Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?

Example of an amphoteric oxide is:

Which of the following metals liberate hydrogen with 5% HNO₃?

(i) Cu

(ii) Zn

(iii) Mn

(iv) Mg

Which one of the following metals does not react with cold as well as hot water?

Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

The defect of vision in which the person is able to see a distant object distinctly but cannot see nearby objects clearly is called:

Assertion: The near point of a hypermetropia eye is more than 25 cm away.

Reason: Hypermetropia is corrected using spectacles containing concave lenses.

Graphite is used as a lubricant in machines because ______.

The allotrope of carbon which is a good conductor of heat and electricity is ______.

Lead pencil contains ______.

From which of the following substance pencil lead is formed?

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

Silver articles become black on prolonged exposure to air. This is due to the formation of

Stainless steel is very useful material for our life. In stainless steel, iron is mixed with