CBSE 11th Standard Chemistry Subject Value Based Questions 2 Mark Questions 2021 Part - I
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CBSE 11th Standard Chemistry Subject Value Based Questions 2 Mark Questions 2021 Part - I
11th Standard CBSE
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Reg.No. :
Chemistry
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Wilhelm Rontgen showed that when electrons strike a material in the cathode ray tube, some rays are originated that can cause fluorescence in the fluorescent material placed outside the cathode ray tubes. He named these rays as X-rays as these were not deflected by electric and magnetic field. X-rays are used as a diagnostic tool in the treatment of disease and bone fracture. An intelligence officer, John catched a smuggler by using this X-ray machine. He was trying to smuggle the drugs while travelling abroad.
The approximate wavelength of X-rays is ............(a) -
What do you mean by hydrogen economy? How can it be helpful for our society?
(a) -
Ionic compounds have high melting and boiling points. There is strong electrostatic force of attraction between them. Answer the following:
(i) Why ionic solids are poor conductor of electricity?
(ii) What happens to the electrical conductivity when they are dissolved in water?
(iii) What is the value associated with it?(a) -
(i) What do you mean by diffusion?
(ii) Ammonia and hydrochloric acid gases are prepared at the two extreme corners in the laboratory. Which gas will reach first to a person in the centre of the laboratory?
(iii) Write down the value points(a) -
While working in laboratory a student kept ferrous sulphate in a vessel made up of zinc. After few days he found cracks in the container.
(i) Why cracks were found in the container?
(ii) Write down the chemical reaction takes place.
(iii) What is the value associated with this?(a)
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CBSE 11th Standard Chemistry Subject Value Based Questions 2 Mark Questions 2021 Part - I Answer Keys
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0.1 nm.
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The basic principle of hydrogen economy is the transpiration and storage of energy in the form of liquid or gaseous dihydrogen. It can be used in fuels cells for generation of electric power. It can be used as non-polluting fuel in near future.
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(i) In solid form they are (anions & cations) closely packed, that is why they are not able to move.
(ii) In water they aquire mobility and can conduct electricity.
(iii) By this property these compounds can be applied in electroplating of all types of cells. -
(i) Intermixing of particles 9ases or liquids spontaneously is called diffusion. Liquids diffuse at a slower rate as compared to gases.
(ii) Ammonia gas will reach first to a person in the centre of the laboratory because it is lighter than hydrochloric acid.
(iii) The phenomenon of diffusion of gases is very useful in daily life. As a result of diffusion, the poisonous effect of the gases gets slowly diluted -
(i) Zinc is placed above iron in the reactivity series. It has therefore reduced Fe2+
ions to Fe.
(ii) Zn(s) + Fe2+⟶Fe(s) + Zn2+(aq)
(iii) One should be very careful in selecting container for storing certain chemicals.
