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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.
| 6901. |
Classify the following into physical and chemical changes. Ripening of fruits |
| Answer» SOLUTION :CHEMICAL CHANGE | |
| 6902. |
Classify the following into physical and chemical changes. Glowing of a bulb |
| Answer» SOLUTION :PHYSICAL CHANGE | |
| 6903. |
Classify the following into physical and chemical changes. Freezing of water |
| Answer» SOLUTION :PHYSICAL CHANGE | |
| 6904. |
Classify the following into physical and chemical changes. Burning of wax |
| Answer» SOLUTION :CHEMICAL CHANGE | |
| 6905. |
Classify the following into acidic oxides and basic oxides: Na_2O,SO_2,MgO,CO_2 |
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Answer» SOLUTION :ACIDIC OXIDES : `SO_2,CO_2` BASIC oxides: `Na_2O, MGO` |
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| 6906. |
Classify the following into acidic ,basic or neutral. (i) NaCl (ii) Na_2SO_4(iii) CaCl_2 (iv) K_2CO_3 |
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Answer» Solution :(i) ACIDIC salt- `CaCl_2` (II) Basic salt- `K_2CO_3` (III) Neutral salt- NACL, `Na_2SO_4` |
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| 6907. |
Classify the following elements into groups of triads : Cl, Ca, Ba, Sr, K, Li, Br, I, Na |
| Answer» Solution :`{:(CI,LI,CA),(Br,NA,Sr),(I,K,Ba):}` | |
| 6908. |
Classify the following compounds based on the pattern of carbon chain and give their structural formula: (i) Propane (ii) Benzene (iii) Cyclobutane (iv) Furan |
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Answer» Solution :(i) Propane is OPEN CHAIN or a cyclic compound because it CONTAINS an open chain. `CH_(3)-CH_(3)-CH_(3)` [Propane] (ii) Benzene is a carbocyclic compound because it contains carbon atoms cyclic ring of 6 atoms.  (iii) Cyclobutane is a carbocylic compound.  (iv) FURAN is a hetrocylic compound because in the cyclic chain one atom is oxygen atom. 
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| 6909. |
Classify the following chemical reactions as exothermic or endothermic : When ammonium chloride is dissolved in water in a test tube it becomes cold. |
| Answer» SOLUTION :When AMMONIUM CHLORIDE is dissolved in WATER in a test tube it becomes COLD - Endothermic | |
| 6910. |
Classify the following chemical reactions as exothermic or endothermic : Water is added to quick lime. |
| Answer» Solution :Water is ADDED to QUICK LIME - EXOTHERMIC | |
| 6911. |
Classify the following chemical reactions as exothermic or endothermic : Water is added to quick lime . |
| Answer» SOLUTION :WATER is added to QUICK lime - Exothermic | |
| 6912. |
Classify the following chemical reactions as exothermic or endothermic : The decomposition of vegetable matter into compost. |
| Answer» Solution :The DECOMPOSITION of vegetable matter into compost - ENDOTHERMIC | |
| 6913. |
Classify the following chemical reactions as exothermic or endothermic : Silver chloride turns grey in the presence of sunlight to form silver metal. |
| Answer» Solution :SILVER CHLORIDE TURNS grey in the PRESENCE of SUNLIGHT to form silver metal - Endothermic | |
| 6914. |
Classify the following chemical reactions as exothermic or endothermic : Silver chloride turns grey in the presence of sunlight to from silver metal. |
| Answer» Solution :Silver CHLORIDE TURNS grey in the presence of SUNLIGHT to form silver metal - ENDOTHERMIC | |
| 6915. |
Classify the following chemical reactions as exothermic or endothermic : Electrolysis of water. |
| Answer» SOLUTION :ELECTROLYSIS of WATER - ENDOTHERMIC | |
| 6916. |
Classify the following chemical reactions as exothermic or endothermic : Dilute sulphuric acid is added to zinc granules. |
| Answer» Solution :Dilute sulphuric ACID is added to ZINC GRANULES - Exothermic | |
| 6917. |
Classify the following as homologous or analogous pairs: (i) Broccoli and Cabbage (ii) Ginger and Raddish (iii) Fore limbs of birds and lizard (iv) Wings of a bat and Wings of a bird |
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Answer» Solution :(i) Analogous (II) Analogous (III) HOMOLOGOUS (IV) Analogous |
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| 6918. |
Classify the following as exothermic and endothermic reactions. Photosynthesis |
| Answer» SOLUTION :ENDOTHERMIC | |
| 6919. |
Classify the following as exothermic and endothermic reactions. respiration |
| Answer» SOLUTION :EXOTHERMIC | |
| 6920. |
Classify the elements based on their property of conductivity with suitable examples. |
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Answer» SOLUTION : Elements can be classified into three categories on the basis of their conductivity: (1) Metallic elements : They have high VALUES of electrical conductivity. For example, Copper (CU), Aluminium (Al). Silver (Ag). (2) Non-metallic elements : They have low values of electrical conductivity. For example, Oxygen `(O_2)`. Nitrogen `(N_2)`. Chlorine `(Cl_2)`. (3) Metalloids : The values of their electrical conductivity is lower than metals but higher than non-metals. For example, Silicon (Si), GERMANIUM (Ge). |
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| 6921. |
C(l) + O_2(g) rarr CO_2 what is wrong with this equation |
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Answer» The number of CARBON is not same on reactant and product side |
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| 6922. |
Cinnabar is an ore of |
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Answer» HG |
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| 6923. |
CI_(2)+2OH^(-) rarr CIO^(-)+CI^(-) is a __________ type of reaction. |
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Answer» |
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| 6924. |
CI, X and I are the elements of Dobereiner's triad, then what would be the element X ? |
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Answer» <BR> ANSWER :Br |
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| 6926. |
Choosing words from the following list, write down the appropriate words to fill in blanks(i) to (v) below. Addition, carbohydrates, C_n H_(2n - 2) , C_n H_(2n +2),electrochemical, homologous, hydrocarbons, saturated, substitution, unsaturated.The alkanes form (i) _____ series with the general formula (ii) ______The alkanes are (iii) ______ (iv) _____ which generally undergo (v) ______ reactions. |
| Answer» Solution :The alkanes form (i) homologous series with the general FORMULA (ii) `C_n H_(2n + 2)`The alkanes are (ili) saturated. (iv) HYDROCARBONS which generally UNDERGO (v) SUBSTITUTION reactions | |
| 6927. |
Choosing only the substances from the list given in the box below, write equations for the reactions which you would used in the laboratory to obtain : {:((i)"Sodium sulphate",(ii)"Coper sulphate"),((iii)"Iron (II) sulphate",(iv)"Zinc carbonate."):} |
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Answer» Solution :(i) `Na_(2)CO_(3)(s)+H_(2)SO_(4)(aq)toNa_(2)SO_(4)(s)+H_(2)O(L)+CO_(2)(g)` (ii) `CuCO_(3)(s)+H_(2)SO_(4)(aq)toCuSO_(4)(aq)+H_(2)O(l)+CO_(2)(g)` (iii) `FE(s)+H_(2)SO_(4)(aq)toFeSO_(4)(aq)+H_(2)(g)` (iv) `Zn(s)+CuCO_(3)(aq)toZnCO_(3)(aq)+CU(s)` |
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| 6928. |
Choosing only substances from the list given in the box below, write equations for the reactions which you would use in the laboratory to obtain: (i) Sodium sulphate (ii) Copper sulphate (iii) Iron (iv) Zinc carbonate Dilute sulphuric acid, Copper, Iron, Sodium, Zinc, Copper carbonate, Sodium carbonate |
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Answer» SOLUTION :(i) `UNDERSET("SODIUM carbonate")(Na_(2)CO_(3))+underset("Dil sulphuric acid")(H_(2)SO_(4))tounderset("Sodium sulphate")(Na_(2)SO_(4))+underset("Carbon dioxide")(CO_(2))+underset("Water")(H_(2)O)` (ii) `underset("Copper carbonate")(CuCO_(3))+underset("Sulphuric acid")(H_(2)SO_(4))tounderset("Copper sulphate")(CuSO_(4))+underset("Carbon dioxide")(CO_(2))+underset("Water")(H_(2)O)` (iii) `underset("Iron")(Fe)+underset("Sulphuric acid")(H_(2)SO_(4))tounderset("Iron(II) sulphate")(FeSO_(4))+underset("Hydrogen")(H_(2))` (iv) (a) `underset("Zinc")(Zn)+underset("Sulphuric acid")(H_(2)SO_(4))tounderset("Zinc sulphate")(ZnSO_(4))+underset("Hydrogen")(H_(2))` (b) `underset("Sodium carbonate")(Na_(2)CO_(3))+underset("Zinc sulphate")(ZnSO_(4))tounderset("Zinc carbonate")(ZnSO_(3))+underset("Sodium sulphate")(Na_(2)SO_(4))` |
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| 6929. |
Choose the true and false statements for the reaction CuO + H_(2) toCu + H_(2)O . (i) Cuo is an oxidising agent. (ii) H_(2) is being oxidised. (iii) The reaction is a displacement reaction. (iv) The valency of Cu is not changing. |
| Answer» SOLUTION :STATEMENTS, (i), (II) and (iii) are TRUE, while statement (IV) is false. | |
| 6930. |
Choose the strong acids, from the following CH_(3)COOH, H_(2)SO_(4), H_(2)CO_(3), HNO_(3) |
| Answer» Solution :`H_(2)SO_(4)` and `HNO_(3)` are STRONG ACIDS. | |
| 6932. |
Choose the amphoteric oxides amongst the following:Na_2O, ZnO, Al_2O_3, CO_2, H_2O |
| Answer» SOLUTION :ZNO and `Al_2O_3` | |
| 6933. |
Choose from the following ""_(6)C , ""_(8)O, ""_(10)N e, ""_(11)Na, ""_(14)Si a] Elements that should be in the same period b] elements that should be in the same group State reason for your selection in each case. |
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Answer» Solution :`""_(6) C,_(8) O,_(10) NE` are in same period, Le `2^(nd)` period as they have two SHELLS. nNa and `14_Si` are in same period i.e., `3^(rd)` period as they have three shells. `""_(6) C,_(14) Si` are in same GROUP because they have same number of VALENCE electrons i.e, four. |
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| 6934. |
Choose from the following : ""_(20)Ca,""_(3)Li, ""_(11)Na, ""_(10)Ne (i) An element having two shells completely filled with electrons. (ii) Two elements belonging to the same group in the periodic table. |
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Answer» Solution :(i) The element is `""_(10)NE , 2, 8` (ii) The elements are `""_(3)Li,and""_(11)Na" , "Li(2,1)" , "Na(2,8,1).` |
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| 6935. |
Choose combination reaction from the following : |
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Answer» `2NaCl to 2Na+Cl_(2)` |
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| 6936. |
Choose A,B,C or D match the descriptions (i) to (iv) alphabets may be repeated . (A) nonelectrolyte(B) strong elestrolyte(C ) weak electrolyte(D) metallic conductor (i) Molten ionic compound (ii) Carbon tetrachloride (iii) An aluminium wire(iv) A solution containing solvent molecules , solute molecules and ions formed by the dissociation of solute molecules . (v) A sugar solution with sugar molecules and water molecules . |
| Answer» SOLUTION :(i)B (ii) A (III) D (iv) C (v) A | |
| 6937. |
Chlorinereactswith copper , resultingin the formation of ___________. |
| Answer» SOLUTION :COPPER (II) CHLORIDE | |
| 6938. |
Chlorine occurs in the form of the following isotopes. |
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Answer» Cl-35 and Cl-36 |
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| 6939. |
Chlorine is used to prepare PVC and freon. |
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Answer» |
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| 6940. |
Chlorine has two isotopes, viz, Cl -35 and Cl-37. Their atomic masses are 35 and 37. Their chemical properties are same. Where should these be placed in Mendeleev's periodic table? In different places or in the same place? |
| Answer» Solution :Mendeleev arranged the elements in INCREASING order of ATOMIC mass. Since the atomic masses of the isotopes of CHLORINE are 35 and 37, they should be KEPT in different POSITIONS in the Mendeleev Periodic table. | |
| 6942. |
Chlorine, Bromine, Iodine, Oxygen |
| Answer» Solution :OXYGEN : It is a GAS belonging to group 16 while other are HALOGENS belonging to group 17. | |
| 6943. |
Chlorine, Bromine, Arsenic, Fluorine |
| Answer» SOLUTION :ARSENIC : It is a METALLOID and OTHERS are halongns. | |
| 6944. |
Chlorine, Bromine and Iodine form a Dobereiner’s triad. The atomic masses of Chlorine and iodine are 35.5 and 126.9 respectively. Predict the atomic mass of Bromine. |
| Answer» SOLUTION :ATOMIC MASS of BR `= (35.5 + 126.9)/(2) = (162.4)/(2)=81.2` | |
| 6945. |
Chlorine atom and chloride ions |
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Answer» have an equal number of protons CL and `Cl^(-)` both will have same number of protons. |
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| 6946. |
Chips manufacturers flush bags of chips with _________ gas. |
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Answer» OXYGEN |
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| 6947. |
Chief ore of copper is ………. |
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Answer» `CuFeS_(2)` |
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| 6948. |
Chemist measureatoms andmoleculesinKilogram . |
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Answer» |
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| 6950. |
Chemical volcano is an example for…….typw of reaction. |
| Answer» SOLUTION :DECOMPOSITION REACTION | |