Education

  1.   What is a redox reaction? 2.   What is corrosion? Explain its advantage and disadvantage. 3.   What is rancidity? How can we reduce the problem of rancidity? 4.   How is corrosion different from rusting? 5.   What is meant by endothermic and exothermic reactions? Give suitable example for each. 6.   Define different types of chemical reaction and give examples for each. 7.   Why is photosynthesis considered as an endothermic reaction? 8.   In electrolysis of water, why is the volume of gas collected over one electrode double that of the other electrode? 9.   What happens when water is added to solid calcium oxide taken in a container? Write a chemical formula for the same. 10.   Give one use of quick lime. 11.   Give three types of decomposition reaction. 12.   Name the compound used for testing CO 2  gas.

  1.   What is a redox reaction? 2.   What is corrosion? Explain its advantage and disadvantage. 3.   What is rancidity? How can we reduce the problem of rancidity? 4.   How is corrosion different from rusting? 5.   What is meant by endothermic and exothermic reactions? Give suitable example for each. 6.   Define different types of chemical reaction and give examples for each. 7.   Why is photosynthesis considered as an endothermic reaction? 8.   In electrolysis of water, why is the volume of gas collected over one electrode double that of the other electrode? 9.   What happens when water is added to solid calcium oxide taken in a container? Write a chemical formula for the same. 10.   Give one use of quick lime. 11.   Give three types of decomposition reaction. 12.   Name the compound used for testing CO 2  gas.

  1.   Why is Plaster of Paris stored in a moisture proof container? 2.   What do you mean by neutralization reaction? Give two examples. 3.   Mention two uses of baking soda and washing soda. 4.   Why does a milkman add a small amount of baking soda to fresh milk to shift the pH of fresh milk from 6 to slightly alkaline? 5.   Why do acids not show acidic behavior in the absence of water? 6.   Rain water conducts electricity but distilled water does not. Why? 7.   Why don’t we keep sour substances in brass and copper vessels? 8.   What is the common name of CaOCl2? 9.   Name the compound used for softening hard water. 10.   What happens when baking soda is heated? 11.   Give the properties and uses of bleaching powder. 12.   Give a few uses of acids, bases and salts respectively. 1.   How will you test for a gas which is liberated when HCL reacts with an...

  HOTS 1.    On what basis did Mendeleev classified the element? 2.    Define ‘groups and period’? 3.    What is common among all the elements present in one period? 4.    Name two alkali metals present in Group 1. 5.    An element X belongs to II group and 2nd period. Write atomic number and name of element. 6.    The electronic configuration of an atom is 2,8,7. Give its atomic number, nature of oxide. 7.    Why are noble gases placed in a separate group? 8.    Lithium, sodium potassium belong to same group called alkali metals. Wjy? 9.    Give characteristics of period. 10.    State three points of difference between Mendeleev’s Periodic Table and Modern Periodic Table. 1.    How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move: ...

The Formation of Tissues Cells form groups cells that need to perform a single task often group together. This grouping of cells together to perform a function efficiently is called a  Tissue . For Example , Muscles and Blood. The tissue cells have the same structure and they perform the same function. Tissues of Plants and Animals Plant Tissues Animal Tissues Plants do not move so their tissues are predominantly the ones that provide support to them so that they can stand erect. Animals need more energy as compared to plants because they are not stationary. Their tissues are the ones that can support movement. These tissues are made up of dead cells because dead cells can also provide mechanical strength to the plants and do not require much maintenance. The tissues in case of animals are made up of living cells so that they can move and perform several functions. Only certain parts of the plant can grow. The tissues present in such regions of and divide themselves and form new ti...