(i) ZnS have large difference in the size of their ions and due to this it shows Frankel defect. (ii) AgBr shows Schottky defect and Frankel defect.
Packing efficiency of all these kind of arrangements is given as follows. (i) Simple cubic :- Its packing efficiency is 52% . (ii) Body centred cubic :- Its packing efficiency is 68%. (iii) Hexagonal close packing:- Its packing efficiency is 74% . Conclusion :- From the above data we can conclude that hexagonal close packed
In a square close packed two dimensional layer , four other particles touch one particle. Thus its coordination number is 4 .
On heating the crystal lattice, some of the lattice particles gain enough energy that they jump from their lattice points. Due this the crystal appears coloured and its density decreases.
These are the points in a crystal lattice that can be occupied by an atom, ion or a molecule.
In case of solids the particles have strong forces of attractions between them . Due to this they can not move or change their positions. Due to this they are rigid.
This is a type of eye defect Near sightedness or Myopia is a defect of eye in which the objects present near can be seen clearly but the far ibjects can not be seen by the person suffering from this disease. It can arise due to the following reasons :- 1. Increased length of eye
It is the foul smell produced by the oxidation of oils and nuts. Mostly the bitter taste of peanut and food made by frying is due to rancidity . Normally the oily substances which are not covered properly , react with the oxygen of air and get oxidised thus give a foul smell. Removal of
Magnesium is a reactive metal, it reacts with the oxygen of air and forms magnesium oxide. Magnesium oxide makes a layer on the upper surface of the metal. Which makes it difficult for the magnesium to get burnt and give characteristic flame. By using sandpaper we can remove its upper layer for proper combustion reaction
The answer is simple, like you are hungry you can pay more to get the food than that of the person who is less hungry, Similarily here the non metals want electrons thus they spend the energy more , or they release the energy. By this they lose the energy. So smaller is the size
page number 181 1 ਅਵਤਲ ਦਰਪਣ ਦੇ ਮੁੱਖ ਫੋਕਸ ਦੀ ਪ੍ਰੀਭਾਸ਼ਾ ਦਿਓ ।ਉੱਤਰ :- ਅਵਤਲ ਦਰਪਣ ਦਾ ਮੁੱਖ ਫੋਕਸ ਉਹ ਬਿੰਦੂ ਹੁੰਦਾ ਹੈ ਜਿਸ ਉੱਤੇ ਦਰਪਣ ਤੇ ਟਕਰਾਉਣ ਤੋਂ ਬਾਅਦ ਪ੍ਰਕਾਸ਼ ਦੀਆਂ ਕਿਰਨਾਂ ਮਿਲਦੀਆਂ ਹਨ ਜਾਂ ਮਿਲਦੀਆਂ ਹੋਈਆਂ ਪ੍ਰਤੀਤ ਹੁੰਦੀਆਂ ਹਨ 2 ਇਕ ਗੋਲਾਕਾਰ ਦਰਪਣ ਦਾ ਵਕਰਤਾ ਅਰਧ ਵਿਆਸ 20 ਸੈਂਟੀਮੀਟਰ ਹੈ ਉਸ ਦੀ ਫੋਕਸ
ਉੱਤਰ :- ਅਵਤਲ ਦਰਪਣ ਦਾ ਮੁੱਖ ਫੋਕਸ ਉਹ ਬਿੰਦੂ ਹੁੰਦਾ ਹੈ ਜਿਸ ਉੱਤੇ ਦਰਪਣ ਤੇ ਟਕਰਾਉਣ ਤੋਂ ਬਾਅਦ ਪ੍ਰਕਾਸ਼ ਦੀਆਂ ਕਿਰਨਾਂ ਮਿਲਦੀਆਂ ਹਨ ਜਾਂ ਮਿਲਦੀਆਂ ਹੋਈਆਂ ਪ੍ਰਤੀਤ ਹੁੰਦੀਆਂ ਹਨ ।
Molecular solids Covalent solids Metallic solids Ionic solids 1 These are made up of molecules. These are formed by the network formed by the atoms. These solids are formed in metals only by the special bonding. These are formed by the electrostatic attraction between oppositely charged ions. 2 The molecules are held by the
It is the substance that increases the rate of reaction and itself is recovered in the same amount at the ending of reaction. It lowers the activation energy by providing an alternative pathway. And makes the reactants to cross the energy barrier easily. Mostly the transition metals like Iron, Cobalt ,Nickel , Platinum etc are
In case of PCl5 the bond pairs present on the axial position suffer more repulsion than that of bond pairs present on the equatorial position. Actually each bond pair present at the axial position has to face the repulsion of three equatorial bond pairs, due to this the bond is stretched and hence the bond
In case of hydrogen iodide the bond length is larger as compared to hydrogen fluoride. As the size of fluorine is smaller than iodine, the bond between hydrogen and fluorine is stronger and have lower bond length. This makes it harder to break the bond and release H+ ions. But in case of Hydrogen iodide
1. Zinc blende – ZnS 2. Calamine – ZnCO3 Uses of Zinc metal. The zinc metal is used for the manufacture of dying or painting , also for galvanization of iron. It is also used as the outer cover of dry cell and as a cathode also. Ores of copper and their uses Copper pyrites
Void is the empty space present in the crystal lattice. It is the unoccupied space in between the lattice points. There are:- 1. Tetrahedral void 2. Octahedral void
Step 1 : Assume the percentage as grams and divide it with molar mass. Step 2: By this way you have calculated the number of moles , further divide evey term with the smallest term which you have calculated in step 1. Step 3 : Now you have the simple whole number ratio of elements