InterviewSolution
Saved Bookmarks
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.
| 1651. |
Write the formulae of the salts given below : Potassium sulphate , sodium sulphate , calcium sulphate , magnesium sulphate , copper sulphate , sodium chloride , sodium nitrate , sodium carbonate and ammonium chloride. Identify the acids and bases from which the above salts may be obtained . How many families can you identify among these salts ? |
Answer» SOLUTION :The FORMULAE of the GIVEN salts and the acids and bases from which these salts may be OBTAINED are given in the following table . 
|
|
| 1652. |
Three elements A, B and C with similar properties have atomic masses X,Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called? Give one example of such a set of elements. |
| Answer» Solution :The arrangement of these elements is known as Dobereiner.s triad. E.g ONE set of triad is LITHIUM, SODIUM and POTASSIUM | |
| 1653. |
When an iron nail placed in copper sulphate solution, the reddish brown coating onthe nail is |
|
Answer» SOFT and dull |
|
| 1654. |
How are the areas of study-evolution and classification interlinked ? |
|
Answer» Solution :a) Different forms of ORGANISMS or life have EVOLVED during the course of evolution Classification deals with grouping of there organisms into group similarities and differences. b) The characteristics commonly seen in any TWO species will be closely related and they will be closely related and they will have a more recent or common ancetor. C) Thus, classification helps tracing the evolutionary RELATIONSHIP between the two organisms. Hence it can be said that classification and evolution are interlinked. |
|
| 1656. |
What is corrosion? |
| Answer» Solution :When the surface of a metal is ATTACKED by air, water and some other substances, it is SAID to be corroded. This PHENOMENON is KNOWN as CORROSION. | |
| 1657. |
Write the IUPAC name of the compoundoverset(4)(CH_3) - overset(3)(C) -= overset(2)(C) - overset(1)(CH_3). |
|
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 2 and carbon 3, therefore, primary suffix is 2-yne.. Thus, the IUPAC NAME of the GIVEN compound is Root word + Primary suffix But + 2-yne = But-2-yne |
|
| 1658. |
The electronicconfiguration, groupnumberandperiodnumberof anelementwithatomicnumber10 is |
|
Answer» Solution :Itselectronicconfigurationis ` 1 s^2| 2s^22p^22p^6= ( 2.8 )` thismeansit contains2 electronsin K- shelland8electronsin Lshell Itsperiodnumber= no .Of shells=2 itsgroupnumber= No.ofvalanceelectrons`+ 10= 8 +10` =18 [Ifnumberof valanceelectronsis morethan2groupnumber= numberof valenceelectrons+ 10] |
|
| 1659. |
to findelectronicconfiguration, groupnumberandperiodnumberof anelementfromitsatomicnumberpotassiumatomicnumber19 |
|
Answer» Solution :Itselectronicconfiguarationis : ` 1s^2| 2s^12p^6 | 3s^43p^4| 4S ^2= ( 2,8,8,1)` thismeansit contains2 ELECTRONSIN K - shell, 8electronsin L shell8 electronsinM shelland1 electron in Nshell . Itsperiodnumber= Noof shells=4 Itsgroupnumber= no.of valenceelectrons= 1 [Ifnumberof valenceelectronsis 1or2groupnumber= noofvalenceelectrons . |
|
| 1660. |
Two electronic transitions were found to take place in a single electron species. One is deactivation of electron from the 5^(th) shell to the 4^(th) shell and the other is from the 2^(nd)nd shell to the l^(st) shell. Do the energies emitted due to the above transitions have the same wavelength? justify |
|
Answer» Solution :(i) calculation of energy emitted DUE to the above transition (ii) calculation of difference in energy between 5th and 4th and 2nd and 1ST SHELLS (iii) relation between the energy and the frequency of the electromagnetic RADIATION (iv) relation between frequency and the wave- LENGTH of the electromagnetic radiation |
|
| 1663. |
What is colour of Potassium permanganate solution |
|
Answer» Green |
|
| 1664. |
Which reagent is used to convert ethanol to acetaldehyde? |
|
Answer» Conc. `H_(2)SO_(4)` |
|
| 1665. |
Write physical properties of ethanol. |
|
Answer» Solution :Physical PROPERTIES of ethanol are: (i) Ethanol is a colourless liquid having a pleasant SMELL and a burning taste. (ii) Ethanol is a liquid at room temperature. (iii) Ethanol is lighter than air. (iv) Ethanol is MISCIBLE with water. (v) Ethanol is a COVALENT COMPOUND. (vi) Ethanol has no effect on litmus solution. |
|
| 1666. |
Which of the following statement is not true about the following decomposition reaction. 2KClO_(3)to2KCl+3O_(2) |
|
Answer» POTASSIUM is NEITHER undergoing OXIDATION nor reduction |
|
| 1667. |
Write the formula of hydronium ion. |
| Answer» Solution :Formula of HYDRONIUM ION = `H_(3)O^(+)orOH_(3)^(+)` | |
| 1669. |
Which principal is used to obtain energy from the oceans ? |
| Answer» SOLUTION :The difference in TEMPERATURE between the surface water and the water deep inside the ocean is USED to OBTAIN HEAT which is then transformed into electricirty. | |
| 1670. |
When SO_2 dissolves in water the acid formed |
|
Answer» SULPHURIC ACID |
|
| 1672. |
Which amongst the following contains a covalent bond? |
|
Answer» `MgCl_(2)` |
|
| 1673. |
Which of the following salts does not contain water of crystallization? |
|
Answer» Blue vitriol So, baking POWDER does not containwater of crystallisation |
|
| 1674. |
What is meant by homologous series! Mention its characteristics. |
|
Answer» Solution :A series of organic compounds in succession which differ by a definite GROUP (like `-CH_(2)-`) is called homologous series. Characteristics : (1) Each member of the homologous series contains same elements and functional group (2) Each member of the series can be expressed by general molecular formula viz. each member of alkane series can be expressed by general formula `C_(n)H_(2n+2)`. (3) The difference in molecular formula between two successive members of the series is equal to `CH_(2)`. (4) There is difference of 14 u between molecular masses of any two successive members of the series. (5) Same number of PREFIX or suffix is applied to each member of the series in their nomenclature. (6) Each member of homologous series contains same functional group and gives same CHEMICAL reaction. (7) The molecular mass of the member of series increases DUE to increase in the atoms of carbon and hydrogen. Hence, the physical properties based on the molecular masses of the members viz. boiling point, melting point, density, solubility, etc. have gradual change. |
|
| 1675. |
Which of the following two experimental set-ups would be appropirate for the preparation and collection of SO_(2) gas in the laboratory ? |
|
Answer»
|
|
| 1676. |
The scientist who propounded the modern periodiclaw is …………. . |
| Answer» SOLUTION :HENRY MOSELEY | |
| 1677. |
You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl, dilute HNO_(3),ZnCl_(2), and H_(2)O. In which of the above containers can these solution be kept ? |
| Answer» Solution :The solution can be STORED in a copper vessel as copper is least REACTIVE and it less reactive than hydrogen and ZINC. The solutions cannot be stored in aluminium containers as aluminium is more reactive than hydrogen and zinc and DISPLACES hydrogen and zinc from their solutions. | |
| 1678. |
The volume occupied by 1 mole of a diatomic gas at S.T.P is ……………. . |
|
Answer» 11.2 litre So (C ) is the correct answer. |
|
| 1679. |
Write the chemical equations for theEthyne to ethane conversion |
| Answer» SOLUTION :`HC -= CH OVERSET(2H_2)(to) H_3C - CH_3` | |
| 1680. |
What is meant by denatured alcohol? What is the need to denature alcohol? |
|
Answer» SOLUTION :Denatured alcohol is ETHYL alcohol which has been MADE unfit for drinking purposes by adding poisonous substances like methanol, pyridine, copper sulphate, etc. Ethanol is an IMPORTANT chemical. It is SUPPLIED at concessional rates to industries. It is therefore, made unfit for drinking purposes to prevent its misuse. |
|
| 1681. |
Which of the following state of matter is rigid? |
|
Answer» Solid |
|
| 1682. |
Whichof thefollowinghas the highestnumberof molecule ? |
|
Answer» `2 gof H_(2)` |
|
| 1683. |
Vinu dissolves 50 g of sugar in 250 ml of hot water, Sarath dissolves 50 g of same sugar in 250 ml of cold water. Who will get faster dissolution of sugar? and Why? |
| Answer» Solution : Vinu will get faster dissolution of SUGAR. Because, generally solubility of a SOLID solute in a LIQUID solvent increases with INCREASE in temperature. Therefore Vinu dissolves 50 g of sugar in 250 ml of hot water than SARATH dissolves 50 g of sugar in 250 ml of cold water. | |
| 1684. |
What is the equation for the reaction which takes place at the cathode ? |
| Answer» SOLUTION :`AG^(+) (AQ) +E^(-) to Ag(s)` | |
| 1685. |
The two isotopes of chlorine have atomic masses 35 u and 37 u. Should they be placed in the same slot in the periodic table? |
| Answer» SOLUTION :Yes, they should be placed in the same slot because PERIODIC table is based on the atomic numbers of the element and both the isotopes of chlorine have the same atomic number (Z = 17). | |
| 1686. |
You are provided with the following chemicals: [Copper, Lead, Sodium hydroxide, Zinc, Copper oxide, Lead carbonate, Sodium carbonate solution, Dilute hydrochloric acid, Dilute nitric acid and Dilute sulphuric acid.] From the above list, name the chemicals which you would use to prepare each one of the following salts: Copper sulphate |
| Answer» SOLUTION :`CuO+H_(2)SO_(4)toCuSO_(4)+H_(2)O` | |
| 1687. |
You are provided with the following chemicals: [Copper, Lead, Sodium hydroxide, Zinc, Copper oxide, Lead carbonate, Sodium carbonate solution, Dilute hydrochloric acid, Dilute nitric acid and Dilute sulphuric acid.] From the above list, name the chemicals which you would use to prepare each one of the following salts: Zinc sulphate |
| Answer» SOLUTION :`Zn+H_(2)SO_(4)toZnSO_(4)+H_(2)` | |
| 1688. |
You are provided with the following chemicals: [Copper, Lead, Sodium hydroxide, Zinc, Copper oxide, Lead carbonate, Sodium carbonate solution, Dilute hydrochloric acid, Dilute nitric acid and Dilute sulphuric acid.] From the above list, name the chemicals which you would use to prepare each one of the following salts: Lead sulphate |
|
Answer» SOLUTION :`PB(CO_(3))_(2)+2HNO_(3)toPb(NO_(3))_(2)+CO_(2)+H_(2)O` `Pb(NO_(3))_(2)+H_(2)SO_(4)toPbSO_(4)+2HNO_(3)` |
|
| 1689. |
You are provided with the following chemicals: [Copper, Lead, Sodium hydroxide, Zinc, Copper oxide, Lead carbonate, Sodium carbonate solution, Dilute hydrochloric acid, Dilute nitric acid and Dilute sulphuric acid.] From the above list, name the chemicals which you would use to prepare each one of the following salts: Sodium sulphate |
| Answer» SOLUTION :`2NaOH+H_(2)SO_(4)toNa_(2)SO_(4)+2H_(2)O` | |
| 1690. |
What are metalloids or semi-metallic elements ? Give examples. |
|
Answer» Solution :Elements which possess properties of both metals and non-metals are KNOWN as metalloids or semi-metallic elements. In the MODERN periodic table, a zig-zag LINE separates metals and non-metals. The borderline elements such as boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and POLONIUM (Po) are known as metalloids or semi-metals. |
|
| 1691. |
Which reagent is used to identify alcohol consumed persons? |
| Answer» Answer :C | |
| 1692. |
Write the name and formula of the 2nd member of homologousserieshaving general formula C_(n)H_(2n). |
| Answer» Solution :The 2ND member is PROPENE, `C_(3)H_(6)`. | |
| 1693. |
Which product is obtained on burning sulphur? |
| Answer» SOLUTION :SULPHUR DIOXIDE `(SO_2)`is OBTAINED. | |
| 1694. |
Write equation for the reaction of (i) iron with steam (ii) calcium and potassium with water |
|
Answer» Solution :(i) `3Fe(s)+4H_2O (g) to Fe_3O_4(s)+4H_2(g)` (ii) `CA(s)+2H_2O(l) to Ca(OH)_2(aq)+H_2(g)` `2K(s)+2H_2O(l) to 2KOH(aq)+H_2(g)` |
|
| 1695. |
Write separate equations for the reactions which take place at the two electrodes when dilute sulphuric acid is electrolysed between two platinum electrodes . |
| Answer» Solution :`4 OH^(-) to 2H_(2)O + O_(2) +4E^(-)` | |
| 1696. |
Write the number of covalent bonds in the molecule of ethane, propane, and butane. |
| Answer» Solution :ETHANE: seven BONDS, PROPANE: ten, BUTANE: thirteen. | |
| 1697. |
What are the elements of Group 1 and Group 17 ? |
|
Answer» Solution :GROUP 1 : Li, Na, K, Rb, Cs, FR Group 17 : F, CL, Br, I, At |
|
| 1698. |
When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is used in the hydrogenation of oils. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed. |
|
Answer» Solution :The gas EVOLVED is hydrogen gas which is used in the hydrogenation of oil to produce Vanaspati. The EQUATION of the REACTION is given as under `Zn + 2HCl rarr ZnCl_2+H_2` Hydrogen gas BURNS with a pop SOUND. `2H_2 + O_2 rarr 2H_2O` |
|
| 1699. |
Two elements P and Q belong to the 3rd period of the Modern Periodic Table and are in group 1 and 2 respectively. Compare their following characteristics in tabular form: i] The number ofelectron in their atoms ii] The size of their atoms iii] Their metallic character iv] Their tendencies to lose electrons v] The formula of their oxides vi] The formula of their chlorides. |
Answer» SOLUTION : 
|
|
