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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
the decompostionof calciumcarbonate intolime and carbondioxideis a_____ reaction . |
| Answer» SOLUTION :REVERSIBLE | |
| 2. |
The decomposition reaction N_(2)O to N_(2) + O_(2) takes place on platinum surface. Here, the rate of reaction is independent of the concentrations of the reactant . However, when this reaction is carried out in the absence of platinum surface, the rate of reaction depends on the concentration of the reactant How do you account for this ? |
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Answer» SOLUTION :(i) role of PLANTINUM in the REACTION (ii) PROPERTY of platinum (iii) site of decomposition (iv) comparison of mechanism of reaction in the PRESENCE and absence of a catalyst |
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| 3. |
The damage of the optic nerve, leading to blindness, is caused when………....is consumed. |
| Answer» Answer :C | |
| 4. |
The d-block elements are called _________ . |
| Answer» SOLUTION :TRANSITION ELEMENTS | |
| 5. |
The creation of a reservoir behind the dam submerges a vast area of ____ and ____ |
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Answer» |
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| 6. |
The covalency of 'N' in NH_(4)^(+) ion is equal to number of |
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Answer» COVALENT BONDS |
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| 7. |
The covalency of oxygen in hydronium ion is equal to number of |
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Answer» covalent BONDS |
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| 8. |
The cost of table salt ( NaCl )is Rs. 10 per Kg. calculate its cost per mole. ( Molar mass of NaCl is 58.5" gmol"^(-1) ) |
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Answer» |
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| 9. |
The corrosive action in the absence of moisture is called ……………… . |
| Answer» SOLUTION : DRY CORROSION | |
| 10. |
The corrosive action in the presence of moisture is called wet corrosion. |
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Answer» |
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| 12. |
The corrosion of hightly reactive metal can be prevented by painting the metal surface with grease. (True / False) |
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Answer» |
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| 13. |
The correct structural formula of butanoitc acid is … |
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Answer» `H-UNDERSET(H)underset(|)OVERSET(H)overset(|)C-overset(H)overset(|)C=overset(H)overset(|)C-overset(O)overset(||)C-OH` |
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| 14. |
The correct statement about fullerenes is |
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Answer» It is an allotrope of CARBON |
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| 15. |
The correct path of the movement of nerve impulses in the following diagram is |
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Answer» <P>`Q to S to R to P` |
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| 16. |
The correct order of the size of C, N,P,S follows the order |
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Answer» <P>` N LT C lt P lt S ` |
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| 17. |
The ionic radii of Na^(+),F^(-),O^(2-),N^(3-) follow the order |
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Answer» `Na^(+) LT F^(-) O^(2-) GT N^(3-)` |
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| 18. |
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is .......... |
| Answer» | |
| 19. |
The correct electron dot structure of a water molecule is |
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Answer» `H.UNDERSET(* *)overset(* *)O.H` |
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| 20. |
The conversion of K_(2)Cr_(2)O_(7) into Cr_(2)(SO_(4))_(3) is a process of |
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Answer» Oxidation |
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| 21. |
The ___________ contains the group 1 and 2 elements. |
| Answer» SOLUTION :s-block | |
| 23. |
The construction of a dam disturbs the natural balance between the river valley and the animal population . |
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Answer» |
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| 24. |
The consitituents present in baking soda are |
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Answer» CALCIUM bicarbonate |
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| 25. |
The conductivity of a conductor is between (in ohm^(-1) m^(-1)) |
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Answer» ` 10^4 - 10^6` |
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| 26. |
The conduction of electricity through a solution involves the movement of _____ |
| Answer» SOLUTION :CHARGED PARTICLES | |
| 27. |
The conditions preferred by some plants are shown in the table below : {:("Plant","Apple","Potato","Black currant","Mint","Onion","Strawberry","Lettuce"),(pH,5.0-6.5,4.5-6.0,6.0-8.0,7.0-8.0,6.0-7.0,5.0-7.0,6.0-7.0):} (a) Which plants grow well over the largest range of pH values ? (b) Which plant can grow in the most acidic soil ? (c) Which plant can grow in the basic soil only ? (d) What is the pH range for onion to grow well ? |
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Answer» Solution :(a) Black CURRENT and strawberry (B) Potato (4.5 - 6.0) (C) Mint ( 7.0 - 8.0) (d) 6.0 - 7.0 |
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| 28. |
The concept of triads in the elements was given by |
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Answer» Newlands. |
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| 29. |
The concentration of OH^(-) in a solution is 1.0xx10^(-10)M. The solution is |
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Answer» ACIDIC `[H^(+)]=[OH^(-)]=1.0xx10^(-7)M` if `[H^(+)]gt1.0xx10^(-7)MTO` acidic solution if `[OH^(-)]gt1.0xx10^(-7)Mto` basic solution SINCE `[OH^(-)]=1.0xx10^(10)lt1.0xx10^(-7)M`the solution is called acidic solution. |
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| 30. |
The compounds of carbon and hydrogen are called____. |
| Answer» SOLUTION :HYDROCARBONS | |
| 32. |
The compound which gives effervescence with baking soda solution is |
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Answer» `C_2H_6O` |
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| 33. |
The compound formed when ethene reacts with hydrogen is _____ (CH_4 , C_2H_6, C_3H_8) |
| Answer» SOLUTION :`C_2H_6` | |
| 34. |
The compound formed by the reaction of an alcohol with carboxylic acid is known as…………………and the reaction is called…………………. |
| Answer» SOLUTION :ESTER, ESTERIFICATION | |
| 35. |
The compound containing 4 carbon and 8 hydrogen atoms is an _______. (alkane/ alkene) |
| Answer» SOLUTION :ALKENE | |
| 36. |
The compound C_(5)H_(12) can be represented by the following two structures. (i) CH_(3)-CH_(2)-CH_(2)_CH_(2)-CH_(3) (ii)CH_(3)- underset(CH_(3))underset(|)(CH)-CH_(2) -CH_(3) These two structures are related to each other as |
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Answer» allotropes |
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| 37. |
Consider the reaction CH_(3)CH_(2)CH_(2)OH overset(PCl_(5))toAunderset(KOH)overset(alc)toB. The compound 'B' is |
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Answer» PROPENE |
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| 38. |
The compositio of thermite mixture is |
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Answer» iron (III) oxide and aluminium powder in the RATO 1 : 3 |
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| 40. |
The common name of sodium bicarbonate is |
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Answer» LIME |
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| 41. |
The common name of methanoic acid is………………… |
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Answer» ACETIC ACID |
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| 42. |
The combustion of 1 mol of benzene takes place at 298 K. After combustion CO_(2) and H_(2)O are formed and 3267 kJ mol^(-1) of heat is liberated. Calculate Delta_(f) H^(0) (C_(6)H_(6)). Given: Delta_(f) H^(0) (CO_(2)) = -286kJ mol^(-1), Delta_(f) H^(0) (H_(2)O) = - 393 kJ mol^(-1) |
| Answer» SOLUTION :`48.51 KJ MOL^(-1)` | |
| 43. |
Thecombinationof productsin a reversiblereactionsis called______ Reaction. |
| Answer» SOLUTION :BACKWARD | |
| 44. |
The colour of the precipitate obtained when an aqueous solution sodium chloride is treated with silver nitrate solution is |
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Answer» black |
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| 45. |
The colour of the precipitate formed by the reaction of lead nitrate with potassium iodine is. |
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Answer» WHITE |
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| 46. |
The colour of copper sulphate solution changes when an iron nail is dipped in it. State the reason giving chemical equation for the reaction involved. |
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Answer» Solution :`CuSO_4+Fe to FeSO_4+Cu` (Blue) (Green) IRON is more REACTIVE than copper. Hence it displaces copper from copper sulphate and DUE to FORMATION of `FeSO_4`, the colour changes from blue to green. |
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| 48. |
The colour of the pH strip turned red when it was dipped into a sample. The sample could be: |
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Answer» DILUTE `NaHCO_(3)` solution |
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| 49. |
The colour change takes place when copper (II) oxide reacts with dilute hyfrochloric acid is…. |
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Answer» BLUE to green |
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