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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.
| 951. |
Write the differences between electrolytic reduction and reduction with carbon. |
| Answer» Solution :Electrolytic reduction is employed to isolate an active metal from its fused SALT, while CARBON is USED to reduce an oxide of a metal in the middle of the activity SERIES and isolate the metal . | |
| 952. |
Which among the following changes arc exothermic or endothermic in nature? |
Answer» SOLUTION :
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| 953. |
Write the relation between Delta H and Delta U " for " H_(2) (g) + I_(2) (g) rarr 2HI (g) |
| Answer» SOLUTION :`DELTA H = Delta U` | |
| 954. |
Which Sanskrit prefix was used by Mendeleev in the naming of elements which were not discovered at that time? |
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Answer» |
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| 955. |
Write the name and formula of the 2nd member of homologous series having general formula C_(n)H_(2n). |
| Answer» Solution :Second MEMBER of the series is `C_(3)H_(6)` (Propene) | |
| 956. |
What happens when dilute hydrochloric acid is added to iron fillings ? Tick the correct answer. |
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Answer» Solution :The REACTION can be WRITTEN as . `Fe+2HClrarrFeCl_(2)+H_(2)` `therefore` The correct option is (a) |
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| 957. |
What was Dobereiner's basis of classifying elements? |
| Answer» Solution :According to DOBEREINER, elements having similar PROPERTIES can be ARRANGED in triads in which atomicmass of the middle element is the mean of the ATOMIC masses of the other two elements. | |
| 958. |
When an acid reacts with a metal, hydrogen gas is produced. |
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Answer» |
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| 960. |
Which of the following stands for a double displacement reaction ? |
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Answer» `2H_(2) + O_(2)to 2H_(2)O` |
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| 961. |
Which of the following is an odd compound? |
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Answer» Ethene |
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| 962. |
Which of the following is a mono basic acid? |
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Answer» `H_2 SO_4` |
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| 963. |
Which one of the following is most reactive?LiNaKRb |
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Answer» Li |
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| 964. |
Which of the following statements is not a correct statement about tbe trends when going from left to right across the periods of periodic Table? |
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Answer» The elements BECOME LESS METALLIC in nature |
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| 965. |
You are given a copper coil, 6V battery and iron filings. What effects of electric current can you demonstrate using these materials? |
| Answer» SOLUTION :MAGNETIC EFFECT of ELECTRIC CURRENT | |
| 966. |
Write the number of covalent bonds in the molecule of Propane, C_(3)H_(8) |
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Answer» |
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| 967. |
What happens when a small piece of sodium is dropped into ethanol ? |
| Answer» Solution :When a small PIECE of sodium DROPPED into ethanol , it reacts steadly to give off BUBBLES of HYDROGEN , GAS and leaves a colourless solution of sodium ethoxide. | |
| 968. |
Which of the following is an example of homo triatomic molecule? |
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Answer» Phosphorous |
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| 969. |
When lead powder is added to copper chloride solution ,a displacement reaction occurs and solid copper is formed. (i)Write the equation for the reaction. (ii)Why does the displacement reaction occur ? |
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Answer» SOLUTION :(i) `UNDERSET("Lead")(Pb)+underset("COPPR chloride")(CuCl_(2))tounderset("Lead chloride")(PbCl_(2))+underset("copper")(Cudarr)` (ii)Copper is LESS reactive than lead.So lead has displaced copper from copper chloride.It is a displacement reaction. |
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| 970. |
Which of the statements about the reaction below are incorrect ? 2PbO(s)+C(s)to2Pb(s)+CO_(2)(g) Lead is getting reduced. |
| Answer» Solution :LEAD is getting reduced is incorrect ANSWER. | |
| 971. |
What do you mean by functional groups ? Given examples. |
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Answer» Solution :A single atom or a group of atoms that determines the chemical nature of an ORGANIC COMPOUND is called a functional group . Example : OH [alcohol] and `-underset(O)underset(||)(C)-OH` [carboxylic ACID] |
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| 972. |
What is the role of inhalation and exhalation? |
| Answer» Solution :Diaphragm changes its shape during INHALATION and EXHALATION, increases and decreases volume of thoracic CAVITY RESPECTIVELY. This causes entry and expulsion of AIR from lungs | |
| 973. |
Which of the following is not the characteristic of carbon? |
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Answer» CARBON FORM allotropes |
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| 974. |
Which of the following is not useful as a good conductor of heat ? |
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Answer» Silver |
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| 975. |
What is meant by combination reaction ? Explain it with a suitable example. |
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Answer» Solution :CHEMICAL REACTION in which two or more SUBSTANCES (reactants) undergo reaction to form a single product is called combination reaction. For example `underset("(Lime stone, quick lime)")(underset("Calcium oxide")(CaO(s)))+underset("water")(H_(2)O(I)) to underset("(Slaked lime, lime water)")(underset("Calcium hydroxide")(Ca(OH)_(2)(aq)))` In above reaction, two compounds CaO(s) and `H_(2)O(l)` undergo chemical reaction and form single product `Ca(OH)_(2)(aq)`, ALONG with evolution of HEAT. Thus, this reaction is a combination reaction. |
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| 976. |
Which among the following factors changes the value of ionic product of water ? |
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Answer» CHANGE in temperature |
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| 977. |
What is the relationship between pH and pOH? |
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Answer» pH-pOH=14 |
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| 978. |
Your are given harmmer, a battery , a bulb, wires, and a switch. a. How could you use them to distinguish between samples of metals and non-metals? b. Assess the usefulness of these tests in distinguishing between metals and non metals. |
| Answer» Solution :With the hammer, WER can BETAT the sample and if it can be beaten into thin sheets (That is it is malleable ) then it is METAL OTHERWISE a non metal. Similarly we can use the battery, bulbs, wires and a switch to set up a circuit with a sample. If the sample conducts ELECTRICIY, then it is a metal otherwise a non-metal. | |
| 979. |
What kind of compounds are called ionic compounds ? |
| Answer» Solution :Compounds FORMED by the TRANSFER of electrons from ONE atom to the other, are called ionic compounds. | |
| 980. |
Vinegar is a solution of (A) 50% acetic acid in ethanol (B) 10% of acetic acid in alcohol (C) 6% acetic acid in water (D) 50% acetic acid in water |
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Answer» 50% ACETIC ACID in ethanol |
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| 981. |
Which of the following is true ? |
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Answer» In an endothermic equilibrium REACTION, activation energy REQUIRED for a forward reaction is higher than that for a BACKWARD reaction. |
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| 982. |
What is Sacrificial metal ? |
| Answer» SOLUTION : The EASILY corrodiblemetal is CALLED SACRIFICIAL METAL . | |
| 983. |
Write the balanced chemical equations for the following reactions : Sodium hydrogencarbonate on reaction with hydrochloric acid sodium chloride, water and liberates carbon dioxide. |
| Answer» SOLUTION :`NaHCO_(3)+HCL to NaCl+H_(2)O+CO_(2)` | |
| 984. |
Write the chemical name and formula of gypsum. What happens when gypsum is heated at 373 K ? Write chemical equation for the reaction. |
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Answer» Solution : Chemical NAME : Calcium sulphate hydrated Formula : `CaSO_4.2H_2O` On heating gypsum at 373 K, gypsum changes to plaster of PARIS. 
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| 985. |
which of the following will give a true solution when dissolved in water ? |
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Answer» FIND SAND |
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| 986. |
The sum of all the quantum numbers of all the A valence electrons of an atom of an inert gas is 22. Identify the inert gas |
| Answer» Solution :A SPHERICAL orbital that has three nodal regions and contain a pair of electrons is `4s^2`. Since this is the only orbital of that MAIN energy level that is occupied with electron, the valence SHELL is 4. All the penul- timate shells are completely filled. Therefore, the electronic configuration is `[Ar]3d^(10)4s^2` Therefore, the atomic NUMBER of that element is 30 | |
| 987. |
What is a thermit reaction? State one uses of this reaction. |
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Answer» Solution :The REACTION between iron (III) Oxide `(Fe_2O_3)` and ALUMINIUM gives out LOTS of HEAT. It is called the thermit reaction. `Fe_2O_3(s)_(Iron(III)ox ide)+2Al(s)_(Aluminium)to 2Fe(l)_(iron)+Al_2O_3(s)_(Aluminiumox ide)+Heat` This DISPLACEMENT reaction is used to join railway tracks or cracked machine parts. The heat given out in the reaction melts the iron formed. the molten iron runs down between the tracks and welds them together. |
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| 988. |
Which of the following hydrocarbons undergo addition reactions ? C_(2)H_(6),C_(3)H_(8),C_(3)H_(6),C_(2)H_(2) and CH_(4). |
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Answer» Solution :`C_(3)H_(6)` and `C_(2)H_(2)` are UNSATURATED hydrocarbons, hence, they undergo ADDITION REACTION. `C_(3)H_(6)(C_(n)H_(2n)):H-UNDERSET(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)C=underset(H)underset(|)C-H`(Alkene) `C_(2)H_(2)(C_(n)H_(2n-2)):H-C-=C-H`(Alkyne) |
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| 989. |
Which of the following is an example of condensation Polymers ? |
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Answer» POLYETHENE |
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| 990. |
The volume occupied by 4.4 g of CO_(2) at S.T.P………… |
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Answer» 22.4 litre The volume occupied by 1 mole i.e. 44 g (molar MASS) of `CO_(2)`. 44 g of `CO_(2)` occupied 22.4 litre of volume. `therefore"4.4 g of "CO_(2)" will occupy"(22.4)/(44)xx4.4=(22.4)/(10)="2.24 litre."` So, answer (B) is CORRECT. |
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| 991. |
Which of the following is double displacement reaction ? |
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Answer» `2FeSO_(4)toFe_(2)O_(3)+SO_(2)+SO_(3)` |
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| 992. |
Which of the following compounds has a double bond? |
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Answer» `C_14 H_28` |
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| 993. |
Write the equation for the laboratory preparation of ethyne (acetylene) from calcium carbide. |
| Answer» SOLUTION :`CaC_2+ 2H_2Oto C_2H_2 + CA(OH)_2` | |
| 996. |
To the three solutions listed below, a few drops of phenophthalein and blue litmus were added separately. Specify the colour change in each case, if any: |
Answer» SOLUTION :
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| 997. |
Which of the following are not correct for carbon compounds ? |
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Answer» They are good CONDUCTORS of electricity. |
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| 998. |
Whichof thefollowingmethodis suitablepreventingan ironfryingpanfromrusting |
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Answer» APPLYING grease |
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| 999. |
Tooth enamel contains : |
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Answer» CALCIUM CARBONATE |
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| 1000. |
Which one produces more heat on combustion-one mole methane or one mole ethane? |
| Answer» SOLUTION :ONE MOLE ETHANE | |