most important question, class 10, science, ch – 1

  1. What is the colour of K2CrO4 (Potassium chromate)?
  2. What happens when a chemical reaction occurs?
  3. What happens when Hydrogen combines with Oxygen in the presence of an electric current?
  4. Why do gold and platinum not corrode in moist air?
  5. Give an example of a double displacement reaction.
  6. What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which the reaction between them will not take place. Write the balanced chemical equation for the reaction and name the type of reaction. (Delhi 2010)
  7. When the powder of a common metal is heated in an open china dish, its colour turns black. However,when hydrogenis passed over the hot black substance so formed, it regains its original colour. Based on the above information answer the following questions;(i) what type of chemical reaction takes place in each of the two given steps? (ii) Name the metal initially taken in the powder form. Write balanced chemical equations for both reactions.   (AI 2010)
  8. A housewife wanted her house to be whitewashed. She bought 10 kg of quick lime from the market and added it to 30 litres of water. On adding quick lime to water she noticed that the water appeared to be boiling even when it was not being heated. Give reason for her observation. Write the corresponding chemical equation and name the product formed.   (CBSE Sample Paper 2009)
  9. When magnesium ribbon burns in air or oxygen a product is formed. State the type of chemical reaction and name the product formed in the reaction. Write balanced chemical equation of this reaction. ( AI 2009C)
  10. What is a redox reaction? When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why? (Foreign 2009)

For more videos you can visit my youtube channel science world :

174 thoughts on “most important question, class 10, science, ch – 1”

  1. More than likely there are several of these in your niche, but you ll need to find them first. What s an internal link. It s a win-win for everyone involved. [url=,2838.0.html],2838.0.html[/url]

  2. smart tv 32 ofertas
    Contamos con servicios de diseño y desarrollo web, gestión estratégica de redes sociales. Más de 5,000 productos en electrodomésticos grandes, pequeños, línea blanca, audio y video, deporte, gimnasio, belleza y cuidado personal, perfumería, y mucho más para hogares y oficinas. Envíos a todo el Perú.

  3. Nice post. I was checking constantly this blog and I’m impressed! Very useful info particularly the last part 🙂 I care for such information much. I was seeking this particular info for a very long time. Thank you and good luck.

  4. Generally I do not read article on blogs, but I wish to say that this write-up very forced me to try and do it! Your writing style has been surprised me. Thanks, quite nice article.

  5. Hello! I know this is kind of off topic but I was wondering if you knew where I could locate a captcha plugin for my comment form? I’m using the same blog platform as yours and I’m having difficulty finding one? Thanks a lot!

  6. The National Gallery dilantin therapeutic level canada He’s not able to shoot the ball right-handed at this point”.We know he loves to shoot

Leave a Comment

Your email address will not be published.