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1201.

Name the process involved in the following changes: 1. liquid to solid, 2. gas to liquids, 3. solid to gas 4. solid to liquid.

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SOLUTION :1. Solidification 2. CONDENSATION, 3. Sublimation 4. LIQUEFACTION (or fusion or melting ).
Discussion
1202.

Name the process by which two or more different types of matter intermix on their own.

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SOLUTION :DIFFUSION.
Discussion
1203.

Name the process associated with the following: (i) Setting of solid particles in a liquid. (ii) Acetone bottle is left open by mistake and the bottle becomes empty. (iii) Milk is churned to separate cream from it. (iv) Potassium permanganate crystals are dropped in water with stirring.

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SOLUTION :(i) Sedimentation,
(II) Sublimation,
(iii) CENTRIFUGATION,
(IV) Diffusion.
Discussion
1204.

Name the process associated with the following (a) Dry ice is kept at room temperature and at one atmospheric pressure. (b) A drop of ink placed on the surface of water contained in a glass spreadsthroughout the water. (c) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring. (d) A acetone bottle is left open and the bottle becomes empty. (e) Milk is churned to separate cream from it. (f) Settling of sand when a mixture of sand and water is left undisturbed for some time. (g) Fine beam of light entering through a small hole in a dark room. Illuminates the particles in its paths.

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Solution :(a) Sublimation (b) Diffusion/Sedimentation (c ) Dissolution/Diffusion (d) Evaporation/Diffusion (e) Centrifugation (F) Sedimentation (G) SCATTERING of light (Tyndall EFFECT).
Discussion
1205.

Name the Liquid Metal ?

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SOLUTION :MERCURY
Discussion
1206.

Name the ions in the following compounds : (a) Sodium chloride (b) Potassium nitrate (c) Calcium oxide (d) Zinc sulphide.

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Solution :(a) Sodium CHLORIDE : Sodium cation and chloride anion.
(b) POTASSIUM nitrate : Potassium cation and nitrate anion.
(c) CALCIUM OXIDE : Calcium cation and oxide anion.
(d) ZINC sulphide : Zinc cation and sulphide anion
Discussion
1207.

Name the instrumentwhich can be used to view the atoms of an element .

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SOLUTION :ELECTRON TUNNELING MICROSCOPE (ETM)
Discussion
1208.

Namethe gas produced when zinc dissolvesin dilute HCl?

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SOLUTION :HYDROGEN .
Discussion
1209.

Name the factors that affect the rate of evaporation.

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Solution :The FACTORS are 1 the surface area, 2 temperature, 3. humidity and 4. WIND.
Discussion
1210.

Name the elements included in the first period of the periodic table.

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ANSWER :HYDROGEN, HELIUM
Discussion
1211.

Name the element whose atom contains only one proton and one electrons.

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SOLUTION :HYDROGEN
Discussion
1212.

Name the element whose atoic weight was corrected by mendelev

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Discussion
1213.

Name the different allotropes of sulphur.

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SOLUTION :N/A
Discussion
1214.

Name the components in each of the following mixtures. (i) ice cream (ii) Lemonade (iii) Air (iv) Soil

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Solution :(i) The main constituents of ice cream are fat, MILK solids (skim-milk powder), sugar egg and flavoring.
(ii) Lemonade is a mixture of lemon juice, sugar and water.
(iii) AIR is a mixture of nitrogen, oxygen, carbon dioxide, water VAPOUR and other gases.
(V) Soil is a mixture of clay sand and various salts.
Discussion
1215.

Name the appropriate methods to separate the following mixtures : (a) Nitrogen from air (b) Salt from sea water ( c) Cream from milk (d) Pigments from natural colours.

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Solution :APPROPRIATE methods : (a) FRACTIONAL distillation (B) Evaporation and CRYSTALLISATION ( c) Centrifugation (d) Chromatography
Discussion
1216.

Name the apparatus that you will se of separate the components of mixtures containing two, (i) Miscible liquids, (ii) Immiscible liquids

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Solution :(i) Miscible LIQUIDS- Fractional distillation (Fractionating column and Liebig) Condenser (ii) IMMISCIBLE liquids- Separating funnel.
Discussion
1217.

Name the acid present in the given table.

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SOLUTION :
Discussion
1218.

Name some elements whose properites were predicted by mendelev prior to their discovery

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Discussion
1219.

Name one common substance which can be easily changed from one state to another by heating or cooling

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ANSWER :WATER
Discussion
1220.

Name any two metals which do not react with sodium hydroxide.

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SOLUTION :Few metals do not react with sodium hydroxide. For example: CU, AG, Cr.
Discussion
1221.

Name an element which has the same number of electrons in its first and second shell.

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SOLUTION :BERYLLIUM
Discussion
1222.

Name A,B,C,D,E and F in the followng diagram showing change in its state.

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SOLUTION :
Discussion
1223.

Name A,B,c,D,E and F in the following showing the change in its state:

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Solution :A: Fusion (or melting or liquefaction), B: Vaporisation, C: CONDENSATION: D: Solidification, E: SUBLIMATION: F: Sublimation.
Discussion
1224.

Name A,B,C,D,E and F in the following diagram showing change in its state.

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Solution :
A- FUSION or melting
B- Vapourization
C- Condensation
D- Solidification
E- SUBLIMATION
F- Sublimation.
Discussion
1225.

Name A, B, C, D, E and F in the following diagram showing changes in state :

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Solution :(i) In PROCESS A, a solid is changing into a liquid, so A is melting (or fusion).
(ii) In process B, a liquid is changing into a gas, so B is vaporisation (or boiling).
(iii) In process C, a gas is changing into a liquid, so C is condensation.
(iv) In process D, a liquid is changing into a solid, so D is FREEZING.
(V) In process E, a solid is directly changing into a gas, so E is sublimation.
(vi)In process F,a gas is changing directly into a solid, so F is also sublimation.
Discussion
1226.

Name A, B, C, D, E and F in the following diagram showing change of state.

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Solution :A=Fusion (melting), B=Vaporisation,
C=Condensation(LIQUEFACTION), D=Solidification
E=(freezing), SUBLIMATION, F=Solidification of GASEOUS STATE.
Discussion
1227.

NaCl is insoluble in carbon tetrachloride but soluble in water. Give reason.

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Solution :NaCl is an ionic compound that is soluble in polar solvents LIKE water and insoluble in non- polar solvents like benzene `(C_6H_6)` carbon TETRA CHLORIDE `(CCl_(4)).` WHEREAS, `CCI_4` is an ORGANIC compound, hence it is insoluble in water.
Discussion
1228.

Na^(+),F^(-) and Mg^(+2) ions have the same

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SIZE
ELECTRONIC configuration
ionisation ENERGY
nuclear charge

Answer :B
Discussion
1229.

n water, hydrogen and oxygen are present in the ratio of

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`1:18`
`2:12`
`2:3`
`2:1`

ANSWER :D
Discussion
1230.

Mud is a sol.

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ANSWER :1
Discussion
1231.

Mr.John is working in IICT as a scientist. During the synthesis ofa drug in the laboratory were associated with the drug. Mr. John dissolved the drug obtained in the solvant and added charcoal to it. This was than filtered off which on evaporation gave back the pure drug. Then the assistant asked Mr.John the following question ' what is the role of charcoal'? What was Mr.John's answer ?

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Solution :Charcoal has GOOD adsorbing PROPERTIES. When charcoal is added, it adsorbs the IMPURITIES, and when FILTERED , the impurities are separated from charcoal.
Discussion
1232.

Mr. Paul, whos is working for Asian paints, while constructing a house coated the building with white paint. After a few months his friend. Mr. Richard who is working in a chemical laboratory visited the house and noticed a few dark patches on the white paint here and there due to which the building lost its origincal lustre. He advised his friend to try for restoration of lustre by washing with hydrogen peroxide. Justify the role of hydrogen peroxide.

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Solution :White paint has lead SULPHATE in it. As the polluted atomsphere has `H_2S`, it reduces the lead sulphate to lead SULPHIDE which is black in COLOUR. When these walls are WASHED with hydrogen peroxides, it acts as an oxidizing agent and converts black lead sulphide to white lead sulphate :
`underset("White")(PbSO_4)+H_2Stounderset("Black")(PBS+H_2SO_4)`
`underset("White")(PbS)+4H_2O_2tounderset("Black")(PbSO_4)+4H_2O`
Discussion
1233.

Monsoon is a seasonal wind flowring in a fixed direction in a particularseason.

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ANSWER :T
Discussion
1234.

Molecular formula of a hydrocarbon is C_5H_(10).What type of isomerisms are exhibited by it ? Give the structural formula of the isomes .

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SOLUTION :Molecular formula `C_5H_(10)` corresponds to pentene.It can EXHIBIT position isomerism and chain isomerium .
Possible structural formula are
(i) `underset("1-Penten ")(CH_2=CH)-CH_2-CH_2-CH_3`
(ii)`underset("2-Pentene")(CH_3-CH)=CH-CH_2-CH_3`
(iii) `H_2C=overset(CH_3)overset(|)C-CH_2-CH_3`
(iv) `H_2C=overset(CH_3)overset(|)C-CH_2-CH_3`
`H_3-overset(CH_3)overset(|)C=CH-CH_3`
(I),(ii),(iii),(iv),(v),are position isomers
(i),(v),(i),(v),(iii),(ii),(iv),(ii),(v)are chain isomers
Discussion
1235.

Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their……………….

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ATOMIC numbers
atomic masses
similarities
anomalies

Answer :A
Discussion
1236.

Mixture can be

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HOMOGENEOUS
Heterogeneous
Both a and b
Pure SUBSTANCES

ANSWER :C
Discussion
1237.

Methane is consided as a more envinment friendly fuel than petrol.justify.

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SOLUTION :Methane on combustion produces the least AMOUNT of `CO_2` among all hydrocabons.contains hyrocarbons ranging from `C_5 "to " C_10` These hydrocarbons produce more amount of `CO_2` then methane on combustion.Moreover, the knocking property which reduces the fuel efficiency and requires more amount of fuel PER release of unit ENERGY .DUE to these reasons,methane is considered as more eniroment friendly fuel than petrol.`CO_2` being a greenhouse gas causes global warming .
Discussion
1238.

Metals react with oxygen only to form basic oxides.

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SOLUTION :N/A
Discussion
1239.

Metals like plantinum and palladium find application in the process of purification of hydrgoen.Justify.

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Solution :Metals like PLANTINUM and palladium adsorb hydrogen on their SURFACES. When the metal is HEATED after ADSORPTION , hydrogen gas is expelled .Since other impurities do not GET adsorbed , pure hydrogen can be obtained through this process.
Discussion
1240.

Metals can gain electrons.

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Solution :CORRECT Statement : Metals tend to lose electrons to attain NOBLE Gas ELECTRON configuration.
Discussion
1241.

Metals are good thermal conductors and electrical conductors. 'How the above said properties vary in case of diamond and graphite, which are allotopes of the non-metallic element carbon ?

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Solution :Thermal conductivity and electrical conductivity of metals are attributed to CLOSE packing in metals and the presence of free electorns in the metal LATTICE respectively. Though diamond and graphite are allotropes of CARBON, diamond is a good thermal conducotr due to its rigid three- DIMENSIONAL structure, in which carbon atoms are CLOSELY and regualrly arranged. Diamond is a not good electrical conductor as there are no free electrons in the structure. Graphite on the other hand has free electrons in the layer lattice structure which makes it a good electrical conductor. Graphite is a bad thermal conductor.
Discussion
1242.

Metallic oxides are produced in calcination and roasting.

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SOLUTION :N/A
Discussion
1243.

Mention two features of Bohr's modelwhich helped compensate drawbacks in Rutherford's model of an atom.

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Solution :The following features of Bohr.s model HELPED COMPENSATE drawbacks in Rutherford.s model of an atom:
(1) ) Only certain special orbits known as discrete orbits of electrons are ALLOWED inside the atom.
(2)WHLE revolving in discrete orbits the electrons do not RADIATE energy.
Discussion
1244.

Mention the separation method and property exploited in the speration of the following solid-solid mixtures. (a) S + sand (b) I_2 + sand (c ) KNO_3 + NaCl

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Solution :`{:((a),S+ "sand",,"Solvent extraction ",,"Solubility of one component in a given solvent"),((B), I_2 + "sand",,"Sublimation",,"Ability of one cpomponent to sublime."),((c),KNO_3 + NaCl,,"Fractional CRYSTALLISATION",,"DIFFERENCE in solubility of the COMPONENTS in the same solvent."):}`
Discussion
1245.

Mention the elements present in quick line

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Solution :QUICK line (calcium oxide ) (CAO) element PRESENT are calcium and oxygen .
Discussion
1246.

Mention the elements present in sodium hydrogen carbonate .

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SOLUTION :SODIUM hydrogen CARBONATE `(NaHCO_(3))` ELEMENTS are sodium, hydrogen , carbon and oxygen .
Discussion
1247.

Mention the Difference betweenMixturesand Compounds ?

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SOLUTION :
Discussion
1248.

Mention some oxidation reactions that occur in daily life.

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Solution :In nature the oxygen present in atmospheric air oxidises many things, starting from metals to living TISSUES.
. The SHINING surface of metals tamishes due to the formation of respective metal oxides on their surfaces. This is called corrosion,
. The FRESHLY cut surfaces of vegetables and fruits turns BROWN after some time because of the oxidation of organic compounds present in them.
.The oxidation REACTION in food materials that were le open for a long period is responsible for spoiling of food. This is called Rancidity,
Discussion
1249.

Mendeleev placed coinage metals with ___________metals

Answer»
Discussion
1250.

Mendeleev named certain undiscovered elements as eka boron and eka aluminimum which when later discovered were called ________and ___________

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ANSWER :SCANDIUM ,GALLIUM
Discussion