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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 6851. |
Compare NaCl and CsCl with respect to ease of formation and also strength of ionic bond. |
| Answer» Solution :Ionic compounds are formed easily between larger cation and smaller anion. This is because an atom whose atomic radius is large can FORM a cation easily and an atom that has a small atomic radius can form an anion easily. `Cs^(+)` ION can be formed more easily than `Na^(+)` ion. FORMATION of CsCl is easier than the formation of NACL. Between NaCl and CsCl, as the anion is the same, that is, `Cl^(-)`, the sizes of the cations are compared. `Cs^(+)` has a larger ionic radius than `Na^(+)`. THUS, the strength of ionic bond is more in NaCl than CsCl. | |
| 6852. |
Compare and contrast the nature of aqueous solutions of ammonium acetate and sodium sulphate. |
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Answer» Solution :(i) identification of species undergoing hydrolysis in the respective salts (ii) nature of constituent ions of the given salts (III) comparison of REACTIONS that take place in the respective solutions (IV) comparison of the concentration of hydrogen and hydroxyl ions in the respective solution |
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| 6853. |
Compare and contrast the arrangement of elements in Mendeleev's periodic table and the moderm periodic table. |
Answer» SOLUTION :
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| 6854. |
Compare and contrast fossil fuels and the sun as direct energy sources. |
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Answer» Solution :Fossil fuel are energy sources such as coal and petroleum obtained from underneath of earth.s crust they are directly available to human being for use hence fossil fuels are the direct source of energy these are LIMITED in AMOUNT these are non renewable sources of energy because three cannot be replenished in NATURE fossil fuel take millione of years for their formation. If the present fossil fuel of the earth gets exhausted its formations will take several years. fossil fulls are also very costly. On the other HAND SOLAR energy is a renewable and direct source of energy and will do so for the next five billion years, solar energy is available free of cost to all in unlimited amount it replenishes in the sun itself. |
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| 6855. |
Compare and contrast the arrangement of elements in Mendeleev's periodic table and the Modern Periodic Table. |
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Answer» SOLUTION :Mendeleev’s periodic table Elementsarearrangedintheincreasingorderoftheiratomic masses. There are 8 GROUPS. Groups for noble gas was not present as noble gases were not discovered by that TIME. There was no place for ISOTOPES. Modern periodic table Elementsarearrangedintheincreasingorderoftheiratomic number. There are 18 groups. Groups are not subdivided into sub-groups. A separate group is meant for noble gases. Thisproblemhasbeenclarifiedasslotsaredetermined according to ATOMIC number. |
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| 6856. |
Compare a true solution a suspension and a colloidal solution with respect to their stability. |
| Answer» SOLUTION :A TRUE solution is stable , a suspension is unstable and a colloidal solution is stable . | |
| 6857. |
Comparative study of all the four-blocks of Modern Periodic table. |
Answer» SOLUTION :COMPARATIVE STUD y of BLOCKS 
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| 6858. |
Common salt in water is an example of……….. |
| Answer» Solution :Binary solution | |
| 6859. |
Common salt dissolves in water easily. Give reason. |
| Answer» SOLUTION :Common salt is an ELECTROLYTE. It is easily dissociated into its ions as `NA^+` and `CL^(-)` in a polar solvent water. So NaCl (common salt) an inorganic compound READILY dissolves in water. | |
| 6860. |
Common salt can be separated from its aqueous solution by |
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Answer» filtration |
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| 6861. |
Common salt besides being used in kitchen can also be used as the raw material for making (i) washing soda. (ii) bleaching powder. (iii) baking soda. (iv) slaked lime. |
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Answer» (i) and (ii) |
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| 6862. |
Common salt, besides being used in kitchen, can also be used as the raw material for making (i) washing soda, (ii) bleaching powder, (iii) baking soda, (iv) slaked lime |
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Answer» (i) and (ii) |
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| 6863. |
{:(,"Common Name",,"Formula"),(1.,"Methane",(a),CH_(3)CH_(2)CH_(2)CH_(3)),(2.,"Ethane",(b),CH_(3)CH_(2)CH_(3)),(3.,"Propane",(c),CH_(4)),(4.,"n-Butane",(d),CH_(3)CH_(3)):} |
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| 6864. |
Common laboratory apparatus are usually made of glass or porcelain but not of metals. Give reason. |
| Answer» Solution :Because ACIDS, bases and some salts MAY react with the metals of the laboratory APPARATUS. | |
| 6865. |
Commercially available ethanol is known as |
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Answer» ADULTERATED SPIRIT |
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| 6866. |
How does the electronegativity changes as we move from left to right across a period ? |
| Answer» Solution :a] As we MOVE from left to RIGHT along a period, ELECTRONEGATIVE character increases. This is because of increase in the number of protons which increases the positive charge on the nucleus. THUS, the attractive force between the nucleus and valence electrons increases thereby increasing the tendency of atoms to gain electrons. This increases electronegativity | |
| 6867. |
Comment on the intensity of charge of an electric field when HF and dry air are placed between two charged parallel plates. |
| Answer» Solution :When a polar molecule like HF is placed between charged parallel PLATES, the molecule orients in such a way that the positive end of the molecule is DIRECTED towards the negatively charged plate and the negative end of the molecule is directed towards the positively charged plate. As a result of this, the intensity of the CHARGE on each plate is DIMINISHED. HOWEVER, when dry air (nitrogen, oxygen), which is non-polar in nature is placed, there would be no change in the intensity of the charge. | |
| 6868. |
Combustion reactions aremajorlyused as_________ sources . |
| Answer» SOLUTION :HEATENERGY | |
| 6870. |
Combustion of fuel is |
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Answer» DISPLACEMENT reaction |
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| 6871. |
Combustion of coal is an example of ……..reaction. |
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Answer» Displacement |
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| 6872. |
Combustionmay becalledas an_________ oxidation |
| Answer» SOLUTION :EXOTHERMIC | |
| 6873. |
'Combination reaction is the reverse of decomposition reaction .'' Justify this statement with the help of appropriate chemical equation of each. |
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Answer» Solution :COMBINATION REACTION : Single PRODUCT is formed from two or more reactants `CaO+H_(2)OrarrCa(OH)_(2)` Decomposition reaction : A single reactant breakdown to give simpler products . `CaCO_(3)oversetDeltararrCaO+CO_(2)` |
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| 6874. |
{:("Column-I",underset(("Oxidation sate of N"))(Column-II")),((a)NO,(p)+5),((b) NO2, (q) + 3),((c) NO_(2)^(–) ,(r) + 4),((d) NO_(3)^(–) ,(s) + 2):} |
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Answer» <P> |
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| 6875. |
{:("Column A","Column B"),(a. Na_2O ,"i. Amphoteric oxide"),(b. Cl_2O_7 ,"ii. Acidic oxide"),(c. Al_2O_3,"iii. Neutral oxide"),(d. CO,"iv. Basix oxide"):} |
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| 6876. |
{:("Column A","Column B"),("a. Fluorine"," i. High negative electron gain enthalpy"),("b. Helium"," ii. Most electropositive element"),("c. Chlorine"," iii.Most electronegative element"),("d. Cesium"," iv. Highest ionisation enthalpy"):} |
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| 6877. |
{:("Column A","Column B"),("(1) Sodium burning in chlorine.","(a) neutralisation reaction"),("(2)Sodium hydroxide reacts with hydrochloric acid ","(b) double displacement reaction"),("(3) Silver nitrate solution reacted with sodium chloride .","(c) displacement reaction."),("(4) Sodium metal reactswith water.","(d) combination reaction."):} |
| Answer» SOLUTION :1. (d) , 2.(a), 3.(b), 4.(c) | |
| 6878. |
{:("Column A"," Column B"),("a. Highest element"," i. Cesium"),("b. Highest metal"," ii. Osmium"),("c. Heaviest metal"," iii.Lithium"),("d. Most reactive metal"," iv. Hydrogen"):} |
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| 6879. |
{:("Column A" ,"Column B"),((1) CuSO_(4),(a) "Pale green"),((2)FeSO_(4),(b)"Blue"),((3) Na_(2)SO_(4) ,(c) "White"),((4)BaCl_(2),(d)"Milky white"):} |
| Answer» SOLUTION :1. (b) , 2. (a), 3. (d),4. (c) | |
| 6880. |
{:("Column A"," Column B "),("a. s & p-block"," i. Inner transition elements"),("b. d-block"," ii. s-block elements"),("c. f-block"," iii.Transition elements"),("d. group-1 and group-2" ,"iv. Representative elements"):} |
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| 6881. |
Colour of ZnO is white but changes to yellow upon heating due to |
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Answer» metal excess defect |
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| 6882. |
Collecting rainwater is called |
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Answer» WATER TREATMENT |
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| 6883. |
Coal , petrol and Kersoene are fossil fuels. |
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| 6884. |
Coal and petroleum have some amount of nitrogen and sulphur in them, hence, their combustion causes pollution in environment. |
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| 6885. |
Coal and petroleum are______ natural resources. |
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| 6887. |
Coal and petroleum are |
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Answer» NUCLEAR FUELS |
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| 6888. |
CO_2 turns lime water milky, due to the formation of |
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Answer» `CA(HCO_3)_2` |
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| 6889. |
CO_(2) ,H_(2) O: Triatomic:: S_8,P_(4) : ________. |
| Answer» SOLUTION :POLYATOMIC | |
| 6890. |
CO_(2) exists in the gaseous state, whereas SiO_(2) is a hard solid though both carbon and silicon belong to the same group. Give reasons. |
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Answer» SOLUTION :(i) comparison of size of CARBON and silicon (ii) effect of size of carbon and silicon on the nature of bond present in `CO_(2)` and `SiO_(2)` (III) INFLUENCE of nature of bonds on the structure of the molecules (iv) relation between the structure of the substance and physical state of matter |
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| 6892. |
C_nH_(2n+2) is the general formulaof a homologousseries of hydrocarbons.Is this seriessaturatedor unsaturated . |
| Answer» SOLUTION :SATURATED | |
| 6894. |
Classify the following substances under the headings strong electrolytes , weak electrolytes and nonelectrolytes . |
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Answer» Solution :(i) Strong electrolytes : Ammonium chloride DILUTE hydrochloric acid , sodium acetate , dilute SULPHURIC acid . (II) Weak electrolytes: ETHANOIC acid , ammonium , hydroxide . (iii) None elctrectrolyte : carbon tetrachloride . |
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| 6895. |
Classify the following substances into deliquescent, hygroscopic. |
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Answer» Solution :Conc. SULPHURIC acid, Copper SULPHATE penta HYDRATE, Silica GEL, Calcium chloride, and Gypsum salt. Deliquescent SUBSTANCES: Calcium chloride Hygroscopic substances: Conc. Sulphuric acid, Copper sulphate penta hydrate, Silica gel and Gypsum salt. |
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| 6896. |
Classify the following salts as acidic, basic and neutral : Potassium sulphate, ammonium chloride , sodium carbonate, sodium chloride. |
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Answer» Solution :Acidic : ammonium CHLORIDE BASIC : sodium carbonate NEUTRAL : potassium SULPHATE, sodium chloride |
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| 6897. |
Classify the following reactions as exothermic or endothermic. (i) electrolysis of water (ii) burning of natural gas (iii) decomposition of calcium carbonate (iv) burning magnesium ribbon in air. |
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Answer» SOLUTION :(i) and (iii) - ENDOTHERMIC. (ii) and (IV) - EXOTHERMIC. |
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| 6898. |
Classify the following molecules based on their atomicity and fill in the table: Fluorine (F_(2)), Carbon dioxide (CO_(2)), Phosphorous (P_(4)), Sulphur (S_(8)) Ammonia (NH_(3)), Hydrogen iodide (HI), Sulphuric Acid (H_(2)SO_(4)), Methane (CH_(4)), Glucose (C_(6)H_(12)O_(6)), Carbon nonoxide (CO) |
Answer» SOLUTION :
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| 6899. |
Classify the following into two homologous series and name them. C_3H_4, C_3H_6, C_4H_6, C_4H_8,C_5H_8,C_5H_10 |
| Answer» SOLUTION :ALKENES: `C_3H_6, C_4H_8, C_5H_10 ""` ALKYNES : `C_3H_4, C_4H_6, C_5H_8`. | |
| 6900. |
Classify the following into physical and chemical changes. Rusting of iron |
| Answer» SOLUTION :CHEMICAL CHANGE | |