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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.
| 701. |
Whatis the molecular formula of the alcohol which can be derived from propane? |
| Answer» Solution :Propane : `CH_(3)-CH_(2)-CH_(3)-orC_(2)H_(2)` Alcohol obtained from propane is `C_(3)H_(2)OH` | |
| 702. |
Which of the following is used for dissolution of gold? (a) Hydrochloric acid (b) Sulphuric acid (c ) Nitric acid ,(d) Aqua regia |
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Answer» aqua -regia =`[Conc.HNO_(3)+conc HCI]` |
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| 703. |
what is boiling point ? |
| Answer» SOLUTION :The SPECIFIC temperature at which the VAPOUR pressure of a liquid becomes equal to the atmospheric pressure is CALLED the BOILING point of the liquid. | |
| 704. |
Which endocrine gland is called master gland? Why? |
| Answer» Solution :Pitutiary gland is considered as MASTER ENDOCRINE gland . It is SAID because it controls almost all other endocrine GLANDS. | |
| 705. |
Which of the following sequence of explanation is appropriate for explaining the reason for the periodicity of reducing property in a period or group? (1) Tendency to undergo oxidation decreases in a period and increases in a group (2) In a period ionisation energy increases and in a group it decreases. (3) In a period the atomic size decreases and in a group it increases. (4) The elements present in the left side of the periodic table have strong reducing property. |
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Answer» (a) 3 2 1 4 group it increases. (2) In a period ionisation ENERGY increases and in a group it decreases. (3) Tendency to undergo oxidation decreases in a period and increases in a group. (4) The elements present in the LEFT side of the PERIODIC table have strong reducing property. |
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| 706. |
Whichof thefollowingstatementarecorrectabouta chemicalequilibrium? (i) It isdynamicinnature (ii) The rateof theforwardand backwardreactions are equalat equilibrium (iii) Irreversiblereactions do notattainchemicalequilibrium (iv )the concentration of reaotantsand productsmay bedifferent |
| Answer» Answer :A | |
| 707. |
What happens to the metallic character of the elements as we move in a period from left to right in the periodic table? Give reason. |
| Answer» Solution :Metallic CHARACTER of the element DECREASES along a period due to decrease in ATOMIC size along a period or outermost electrons are CLOSER to nucleus. So they cannot be EASILY lost | |
| 708. |
Write the IUPAC name of the compound overset(4)(CH_3) - overset(3)(CH_2) - overset(2)(C) -= overset(1)(CH) |
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Answer» Solution : There are 4 C ATOMS in the chain involving triple bond, THEREFORE, the root WORD is .but.. There is triple bond in the chain between carbon 1 and carbon 2, therefore, primary suffix is .1-yne.. Thus, the IUPAC name of the given COMPOUND is Root word + Primary suffix But + 1-yne = But-1-yne |
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| 709. |
What are oxidizing agents ? |
| Answer» Solution :CHEMICAL species which bring about oxidation of other species while itself GETTING REDUCED. | |
| 711. |
The simplest hydrocarbon is : |
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Answer» Methane |
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| 712. |
What is meant byductility ? |
| Answer» SOLUTION :Ductility is a property of metalsto be drawn into THIN WIRES WITHOUT breaking . | |
| 713. |
Zinc sulphate heptahydrate is also called as ..... |
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Answer» BLUE VITRIOL |
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| 714. |
Which one is having lesser resistance, a 60W bulb or a 40W bulb? |
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Answer» SOLUTION :POWER `(P) = (V^2)/(R ) therefore R prop 1/P` if v is constant. Hence bulb of higher voltage will have less RESISTANCE. In other WORDS, resistance of 60W bulb is less than the resistance of 40W bulb. |
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| 715. |
What is disporsion of light? Mention the colour that bonds the least and the colour that bends the most when ligh undergoes dispersion through a prism. |
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Answer» SOLUTION :The splitting of LIGHT into its component COLOURS is called DISPERSION. The red colour bends the least. The voilet colour bends the most. |
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| 716. |
Which one of the following metals will not liberate hydrogen gas when treated with dilute hydrochloric acid? |
| Answer» SOLUTION :Copper | |
| 717. |
Write the name and molecular formula of any three metal salts which are white in colour. |
| Answer» Solution :( 1 ) Zinc sulphate `(ZnSO_4)` (2) MAGNESIUM sulphate `(MgSO_4)`( 3 ) Aluminium sulphate` (Al_2(SO_4)_3) ` Above metal SALTS are WHITE in COLOUR. | |
| 718. |
Under what condition lactic acid is produced in the muscle cells ? |
| Answer» SOLUTION :Lactic ACID is PRODUCED when there is lack of oxygen in the musclc CELLS. | |
| 719. |
Write the balanced chemical equation for thereactions : Zinc + Silver nitrate to Zinc nitrate + Silver |
| Answer» Solution :`UNDERSET("ZINC")(ZN(s))+ underset("Silver nitrate")(2AgNO_(3)(aq)) to underset("Zinc nitrate")(Zn(NO_(3))_(2)(aq))+ underset("Silver")(2Ag(s))` | |
| 720. |
Which one represents the correct increasing order of acidic character of the samples?(a) Water< Fruit juice< Sodium bicarbonate(b) Water< Sodium bicarbonate< Fruit juice(c) Fruit juice< Water< Sodium bicarbonate(d) Sodium bicarbonate< Water< Fruit juice |
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Answer» WATER `LT` FRUIT juice `lt` SODIUM bicarbonate |
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| 721. |
Vinegar is a solution of … |
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Answer» 50% - 60% acetic ACID in alcohol. |
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| 723. |
Which among the following is /are the propertiesof organic compounds ? (i)are covalent in nature (ii) exhibitisomerism (iii) have low meltingand boiling point |
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Answer» (i) and (II) |
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| 724. |
Which one of the following can be used as an acid base indicator by a visually impaired student? |
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Answer» Litmus If a basic solution like sodium hydroxide solution is added to vanilla extract then we cannot DETECT the characteristic smell of vanilla extract. An ACIDIC solution like hydrochloric acid, HOWEVER does not destroy the smell of vanilla extract. |
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| 726. |
Write the balanced chemical equation for the following and identify the type of chemical reaction in each case. zinc carbonate (s) to zinc oxide (s) + carbon dioxide(g) |
| Answer» SOLUTION :`ZnCO_3(s)toZnO(s)+CO_2(G)` --------- DECOMPOSITION REACTION | |
| 727. |
Write the balanced chemical equations for the following reactions and identify the type of reaction in each case. |
| Answer» SOLUTION :`H_2(G)+Cl_2(g)to2HCl(g)` ------- COMBINATION REACTION | |
| 728. |
Write the balanced chemical equation for the following and identify the type of chemical reaction in each case. magnesium (s) + hydrochloric acid (aq.) to magnesium chloride (aq.) + hydrogen (g) |
| Answer» SOLUTION :`Mg(s)+2HCl(aq)toMgCl_2(aq)+H_2(G)` ---------DISPLACEMENT reaction | |
| 729. |
Explain with reaction why the lime water turns milky when carbon dioxide is passed through it. |
| Answer» SOLUTION :Carbon dioxide TURNS LIMEWATER MILKY due to the formation of INSOLUBLE calcium carbonate. | |
| 730. |
The structural formula of an organic compound is given below: CH_3-CH_2-O-CH_3 What are the compounds with the given functional group commonly called ? |
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Answer» |
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| 732. |
What is the relationship between the electronic configuration of an element and its valency? |
| Answer» SOLUTION :From ELECTRONIC configuration, we come to know the number of VALENCE electrons, i.e. the number of electrons in the outermost shell. The VALENCY of an element is determined from valence electrons. That is, how many electrons it has to LOSE or gain or share to complete its outermost orbit. | |
| 733. |
Write equations for the laboratory preparation of: sodium sulphate using dilute sulphuric acid. |
| Answer» SOLUTION :`Na_(2)CO_(3)+H_(2)SO_(4)toNa_(2)SO_(4)+CO_(2)+H_(2)OorH_(2)SO_(4)+2NaOHtoNa_(2)SO_(4)+2H_(2)O` | |
| 734. |
Translate the following statements into chemical equations and balance them. Hydrogen gas combines with nitrogen to form ammonia |
| Answer» SOLUTION :`3H_(2)(G)+N_(2)(g)to2NH_(2)(g)` | |
| 735. |
Use Mendeleev's Periodic Table to predict the formulae for the oxides of the following elements: K, C, Al, Si, Ba. |
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Answer» Solution :K is in group 1, Therefore the oxide will be `K_2O`. C is an group 4, Therefore the oxide will be `CO_2`. Si is in group 4, Therefore the oxide will be `SiO_2`. Al is in group 3, Therefore the oxide will be `AI_2 O_3`. BA is in group 2, Therefore the oxide will be `BAO`. |
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| 736. |
Which metal does not release hydrogen gas with nitric acid ? Why? |
| Answer» SOLUTION : Hydrogen gas is not RELEASED when aluminium (Al) and chromium (Cr) react with NITRIC acid, because nitric acid `(HNO_3)`is a STRONG oxidising agent. It oxidises the H, produced to water and itself GETS reduced to any of the nitrogen oxides `(N_2O , NO "or" NO_2)` | |
| 737. |
What is the use of an indicator in titration ? Name the indicator used when sodium hydroxide is titrated against sulphuric acid |
| Answer» SOLUTION :The neutralisation POINT can be determined by the use of INDICATOR. The indicator used when SODIUM HYDROXIDE is titrated against sulphuric acid is phenolphthalein. | |
| 738. |
Two elements ‘P' and 'Q' belong to the same period of the Modern Periodic Table and are inGroup-1 and Group-2 respectively. Compare their following characteristics in tabular form: (a) The number of electrons in their atoms (b) The sizes of their atoms (c) Their metallic characters (d) Their tendencies to lose electrons (e) The formula of their oxides(f )The formula of their chlorides |
Answer» SOLUTION :
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| 739. |
Which amongst the following can lose 2 electrons to acquire the configuration of argon? |
| Answer» ANSWER :C | |
| 740. |
Which of the following does make a homogeneous mixture ? |
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Answer» Fine sand in WATER |
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| 741. |
Write the molecular formula of two consecutive members of the homologous series of aldehydes. State which parts of these. Compounds determine their physical and chemical properties. |
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Answer» SOLUTION :The CONSECUTIVE members are `CH_3CHO` (ACETALDEHYDE) and `C_2H_5CHO` (propanaidehyde). The physical PROPERTIES DEPEND on the alkyl parts `CH_3` - and `C_2H_5-`. The chemical properties depend on the -CHO group. |
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| 742. |
What happens when metals react with acids ? Give one example. |
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Answer» Solution :METALS on reacting with acids produce metal SALTS and hydrogen GAS. `Zn+HCl toZnCl_(2)+H_(2)uarr` |
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| 743. |
What is a chemical quilibrium ?What are its characteristics? |
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Answer» Solution :Chemical EQUILIBRIUM is THESTATE for a revrsible chemical reaction where rate of forward direction is equally balanced by rate of backward direction and the process seems like to be stopped. Its CHARACTERISTICS are, (i) The rate of the forward and backward reaction are equal in a chemical equilibrium. (ii)The OBSERVABLE properties such as pressure,concencentration,color ,viscosity,etc.of the system unchanged with time. (iii)In physical equilibrium ,the VOLUME of all phases remain constant. |
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| 744. |
Two elements X and Y have atomic number 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the Modem Periodic table do these two elements belong? |
Answer» SOLUTION :
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| 745. |
W'hat are organic acids? Give two examples. |
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Answer» SOLUTION :Acids OBTAINED from living beings (PLANTS and animal) are called formic acid. Eg :- Citric acid is present in FRUITS like lemon, oxalic acid in tomato ETC ... |
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| 746. |
What happens when magnesium ribbon burns in air? |
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Answer» Solution :When magnesium RIBBON burns in air, it combines with the oxygen to FORM magnesium OXIDE. `2MG(s)+O_2(G)to2MgO(s)` |
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| 747. |
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. If you are given only red litmus paper, how will you identify the contents of each test tube ? |
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Answer» Solution :(i) Put red litmus papers one by one in each test tube. The test tube in which the red litmus PAPER turns blue CONTAINS a basic solution. There will be no effect on the red litmus paper in the other two test tubes. Acids, Bases and SALTS 53 (ii) Remove the litmus paper which turned blue and put it one by one in the other test tubes. The tube that turns blue litmus red contains acidic solution. (iii) The tube which has no effect on the litmus paper contains distilled WATER. |
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| 748. |
Use your brain power, What is the cause of non - metallic character of element? |
| Answer» SOLUTION :When any element shows TENDENCY to accept or share electrons and forms a NEGATIVE charge, they are said to be electronegative. Non-metals are electronegative. | |
| 750. |
Two solutions A and B have pH values 3 and 8 respectively. Which one of these two will give a pink colour with phenolphthalein indicator? |
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Answer» |
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