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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 most stable carbocation among the following:A. B. C. D. |
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Answer» Correct Answer - C Stability of `C^(oplus) alpha+I, resonancel H.C. % +M` effect |
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| 2. |
The correct set of the following reaction is : A. (I)(i)(Q)B. (II)(i)(P)C. (III)(i)(R)D. None of these |
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Answer» Correct Answer - C This is perkin reaction. |
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| 3. |
The correct set of the following reaction is `CH_3-oversetoverset(O)(||)C-OEt to CH_3-oversetoverset(O)(||)C-CH_2-oversetoverset(O)(||)C-OEt`A. (I)(iv)(P)B. (II)(iii)(P)C. (I)(iii)(Q)D. (III)(i)(R) |
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Answer» Correct Answer - B This is claisen easter condensation reaction |
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| 4. |
The correct set of the following reaction is A. (I)(iv)(P)B. (III)(I)(R)C. (I)(iv)(Q)D. (III)(iv)(R) |
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Answer» Correct Answer - C This is intramolecular Aldol condensation and product is `alpha,beta` - unsaturated carbonyl compound. |
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| 5. |
Which of the following is stronger acid than methanol?A. `CH_(3) - C -= CH`B. C. D. `H_(3)C - underset(h)underset(|)O^(+)-H` |
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Answer» Correct Answer - D Protonated methanol is a stronger acid than methanol. |
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| 6. |
For the given reaction, `R-underset(R_(2))underset(|)overset(R_(1))overset(|)(C )-x overset(HOH)(rarr) R-underset(R_(2))underset(|)overset(R_(1))overset(|)(C )-OH` Which substrate will give maximum racemisation?A. `H_(5)C_(6)- underset(C_(2)H_(5))underset(|)overset(CH_(3))overset(|)C-Br`B. `CH_(2)-CH- underset(C_(2)H_(5))underset(|)overset(CH_(3))overset(|)C-Br`C. D. |
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Answer» Correct Answer - C The substrate which can form most stable carbocation will give maximum racemisation |
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| 7. |
Compare the rate of reaction of following species with `OH^(-)` : (i) A. `I gt ii gt iii`B. `I gt iii gt ii`C. `iii gt ii gt i`D. `ii gt I gt iii` |
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Answer» Correct Answer - A Epoxide undergo ring opening with bases. Greater the ring strain, greater is the reactivity towards base. |
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| 8. |
Consider the structure of `Al_(2)Me_(6)` compound and find the value of `(x-y)/(z)` where `x=` maximum number of atoms that can lie in place having terminal `(Al-Me)` bonds `y=` total number of `3c-2e^(-)` bonds `z=` total number of atoms that are `sp^(3)` hydrized. |
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Answer» Correct Answer - 1 `x=10,y=2,z=8` |
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| 9. |
Which of the following pairs contain molecular solids but different nature of intermolecular forces?A. Ice, `NaCl`B. `NaCl, KCl`C. `SiO_(2),` graphiteD. Ice and dry ice |
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Answer» Correct Answer - D In ice there is hydrogen bonding and dry ice is solid `CO_(2)` which have vader Wasls force of attraction. |
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| 10. |
The total number of Aldols `(beta-` Hydroxy carbonyl compounds) are formed in the following reaction. (Ignore stereoisomers) `PhCHO+CH_(3)CH=O+Ph-underset(O)underset(||)(C)-CH_(3) overset(Dil.NaOH.Delta) (rarr)` |
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Answer» Correct Answer - 6 `PhCHO+CH_(3)CH=O+Ph-underset(O)underset(||) (C)-CH_(3) overset(DilNaOH,Delta)(rarr)` Total `6` aldol products |
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| 11. |
`CH_3 - CH=O+PhCH_2-CH=O overset(HO^(Theta))to` mixture of aldols (z) total number of aldols including stereoisomers Find the mole of z ? |
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Answer» Correct Answer - 12 `CH_3-CH=O+PhCH_2-CH=Ooverset(HO^(Theta),Delta)toCH_3-undersetunderset(OH)(|)overset(**)CH-CH_2-CHO+oversetoverset(Ph)(|)CH_2-undersetunderset(OH)(|)overset(**)CH-undersetunderset(Ph)(|)overset(**)CH-CHO+Ph-CH_2--undersetunderset(OH)(|)overset(**)CH-CH_2-CHO+CH_3-undersetunderset(OH)(|)overset(**)CH-oversetoverset(Ph)(|)CH-CHO` |
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| 12. |
The total number of Aldols (`beta`-Hydroxy carbonyl compounds) are formed in te following reaction. (ignore stereoisomers) `PhCHO+CH_(2)CH=O+Ph-underset(O)underset(||)C-CH_(3)overset(Dil.NaOHDelta)to` |
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Answer» `PhCHO+CH_(3)CH=)+Ph-underset(O)underset(C)-CH_(3)overset(Dil NAOH,Delta)to` Total 6 aldol products |
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| 13. |
According to `MOT` whch of the following statement about magnetic character and bond order is corrent regarding `O_(2)^(o+)` .A. Paramagnetic and bond order `lt O_(2)`B. Paramagnetic and bond order `gt O_(2)`C. Dimagnetic and bond order `lt O_(2)`D. Dimagnetic and bond order `gt O_(2)` |
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Answer» Correct Answer - B `O_(2):sigma1s^(2),sigma^(.)s^(2),sigma2s^(2),sigma^(.)2s^(2),sigma2p_(x^(2)){{:(pi2py^(2)),(pi2pz^(2)):}{{:(pi^(+)2py^(1)),(pi^(+)2pz^(0)):}` Bond order `= (10-6)/(2) = 2.0` (Two unpaired electrons in antibounding molecular orbital) `O_(2)^(+):sigma1s^(2),sigma^(.)s^(2),sigma2s^(2),sigma^(.)2s^(2),sigma2p_(x^(2)){{:(pi2py^(2)),(pi2pz^(2)):}{{:(pi^(+)2py^(1)),(pi^(+)2pz^(0)):}` Bond order `= (10-5)/(2) = 2.5` (One unpaired electron in antibonding molecular orbital so it is paramagnetic) |
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| 14. |
Which of the following graphs correctly represents the variation of `beta= -((dV)/(dP))//V` with `P` for an ideal gas at constant temperatureA. B. C. D. None of these |
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Answer» Correct Answer - A From `PV = Rt , dV.P + V.dP = 0` or `((dV)/(dP)) = -(V)/(P)` or `beta = ((-dV)/(dP))_(T)//V = (1)/(2)` Thus plot of `beta` vs `P` given `(A)` |
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| 15. |
If a circle C, whose radius is 3, touches externally the circle, x2+y2+2x−4y−4=0 at the point (2,2), then the length of the intercept cut by this circle C, of the x−axis is equal to |
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Answer» Given: Radius of circle is 3 Radius of other circle = \(\sqrt{g^2+f^2-c}\) = \(\sqrt{(-1)^2+2^2-(-4)}=3\) Now, circle C is touching externally other circle at point (2,2) Therefore, (2,2) is midpoint of two centres of the circles as radius are equal. Let the coordinate of centre of circle C be (p,q). Centre of other circle is (−1,2) ⇒ \(\frac{p-1}{2}\) = and \(\frac{q+2}{2}\) = 2 ⇒ p = 5 and q = 2 Equation of circle C is (x − 5)2 + (y − 2)2 =32 ⇒ x2 + y2 −10x − 4y + 20 = 0 x-intercept = \(2\sqrt{g^2-c}\) Here, g = (−5) and c = 20 x-intercept = \(2\sqrt{(-5)^2-20}\) = 2√5 |
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| 16. |
A compound with molecular formula C8H18O4 does not give litmus test and does not give colour with 2,4–DNP. It reacts with excess MeCOCl to give a compound whose vapour density is 152. Compound A contains how many hydroxy groups? |
Answer» C8H18O4 does not give litmus test and does not give colour with 2,4- DNP. |
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| 17. |
Mendleeve left the space for elements in periodic table, the elements are `"_________"`A. GaB. ScC. GeD. Te |
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Answer» Correct Answer - A::B::C Data based |
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| 18. |
Which options are correct for atomic radii ?A. `Ne gt F`B. `Ar gt Cl`C. `F gt Ne`D. `Cl gt Ar` |
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Answer» Correct Answer - A::B Data based |
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| 19. |
Which is`//`are ampoteric oxide ?A. `ZnO`B. `BeO`C. `SnO`D. All of these |
| Answer» Correct Answer - D | |
| 20. |
`F` has the highest electronegativity among the group `17` elements (i.e. `ns^(2) np^(2) np^(5)` type), on the Pailing scale, but the `EA` of `F` is less than that of `Cl` becauseA. `F` being the first member of the family behaves in an unusual manner.B. The atomic number of `F` is less than that of `Cl`.C. `Cl` can accommodate an electron better than `F` by utilsing its vacant `3d` orbital.D. Small size, high `EN` and an increased electron-electron replusion makes addition of an electron to `F` less favourable. |
| Answer» Correct Answer - D | |
| 21. |
Which of the following is /are `sp^(3)` hybridised with atleast one lone pair on centre atom ?A. `ICl_(2)`B. `ICl_(2)^(+)`C. `ICl_(3)`D. `PCl_(3)F_(2)` |
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Answer» Correct Answer - A::C::D (A) `ICl_(2)^(-) rarr (2bp + 3lp) = 5 rarr sp^(3)d` (B) `ICl_(2)^(+) rarr (3bp + 2lp) = 5 rarr sp^(3)d` (C ) `Icl_(3) rarr (2bp + 2lp) = 4 rarr sp^(3)` (D) `PCl_(3)F_(2) rarr (5bp + 0lp) = 5 rarr sp^(3)d` |
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| 22. |
if one atom contains one electron and one proton.will it carry any charge or not |
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Answer» atom contains one electron and one proton will carry no charge
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| 23. |
Define and explain osmotic pressure. |
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Answer» Osmotic pressure: The excess of pressure on the side of the solution, that stops the net flow of solvent into the solution through a semipermeable membrane is called osmotic pressure. |
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| 24. |
Acid strength of the conjugate acids of the following are A. IgtIIgtIIIgtIVB. IIIgtIIgtIgtIVC. IVgtIIIgtIIgtID. None of these |
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Answer» Correct Answer - C Stronger the base weaker is the acidic strength of congugate acid |
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| 25. |
The equilibrium constant of the following reaction is A. Less than oneB. more than oneC. `1.0`D. None of these |
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Answer» Correct Answer - B `[K_(298)=(["Products"])/(["Reactant"])]` `K_(298)=1.97pm0.20` Explanation =`(CH_3)_3C^(o+)gt (CD_3)C^(o+)` stability due to hyperconjugation. |
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| 26. |
Hydrogen gas can not be prepared by :A. `Zn + "dil" H_(2) SO_(4)`B. `Zn + "dil" HCl`C. `Zn + "conc." HCl`D. `Zn + "conc." H_(2)SO_(4)` |
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Answer» Correct Answer - D `Zn + "conc." H_(2)SO_(4) rarr ZnSO_(2) + SO_(2) + H_(2)O` |
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| 27. |
The correct reactivity order of following C=C/C=C bonds towards `Br^(o+)` is : A. 4gt3gt2gt1B. 3gt2gt1gt4C. 1gt3gt4gt2D. 1gt3gt2gt4 |
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Answer» Correct Answer - D C=C at position 1 is more reactive towards electrophile `Br^(o+)` as this is adjacent to O atom to provide +m effect.C=C at position 3 is more substituted as compared to C= C at position 2. C= C is less reactive towards `Br^(o+)` as compared to C = C |
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| 28. |
Permanent hardness of water is not due to the `"_______"`A. `CaCl_(2)`B. `MgSO_(4)`C. `MgCl_(2)`D. `BaCl_(2)` |
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Answer» Correct Answer - D Only `mg^(+2)` and `Ca^(+2)` ions cause hardness |
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| 29. |
The acid dissociation constants of the following acids are given as under : From this data, the following observations can be made . Mark the correct statements for above mentioned compounds. (i)The above variation in acidities of the above acids are due to inductive effect only. (ii)The above variation are both to inductive and resonance effects (iii)Inductive effect varies sharply with distance (iv)-I effect of chlorine is not much .A. `i&ii`B. `i&iii`C. `ii&iii`D. `iii&iv` |
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Answer» Correct Answer - B Given data can be explained only by inductive effect and position of chlorine atom. |
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| 30. |
Select the incorrect statements in following :A. `C_(60)` fullerene structure has 20 hexagone.B. In graphite non-metallic covalent bond length is less as compare to `C - C` bond length in between two layer.C. White phosphorus is more stable than Red phosphorus.D. `P_(4), P_(4)O_(6)` and ice, all are cage like structure. |
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Answer» Correct Answer - C White poshphorous is most reactive. |
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| 31. |
The correct order of acidic strength is : A. IIIgtIVgtIgtIIB. IIgtIgtIIIgtIVC. IIgtIIIgtIgtIVD. IIgtIgtIVgtIII |
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Answer» Correct Answer - B In compounds `I^(st)` & `II^(nd)` acidity is decided by Intramolecular H-bonding & compound `III^(rd)` acidity is decided by SIR (steric inhibition to Resonance) |
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| 32. |
Which one of the following reactions is not possible ?A. `CH_3COONa+HCl to CH_3COOH+NaCl`B. `CH_3-SO_3H+H-C-=C-Na to CH_3SO_3Na+H-C=C-H`C. `R-C=C-H+PhONatoPhOH+R-C=C-Na`D. `H-C=C-H+NaNH_2toH-C=C-Na+NH_3` |
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Answer» Correct Answer - C Stonger acid displaces weak acid form its salt |
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| 33. |
Which of the following statements regarding resonance is `NOT` correct?A. The different resonating structures of a molecules have fixed arrangement of atomic nucleiB. The different resonating structures differ in the arrangement of electronsC. The hybrid structure has equal contribution from all the resonating structures alwaysD. None of the individual resonating structure explains all characteristics of the molecules. |
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Answer» Correct Answer - A,B,D Most stable resonating structure contribute maximum & Least Stable resonating structure Contribute minimum in resonance hybrid |
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| 34. |
Which of the following statement would be INCORRECT about this compound ? A. All three C-N bond are of same lengthB. `C_1 -N and C_3-N` bonds are of same length but shorter than `C_5-N` bondC. `C_1 -N and C_5-N` bonds are of same length but longer than `C_3-N` bondD. `C_1 -N and C_5-N` bonds are of same length but both longer than `C_3-N` bond |
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Answer» Correct Answer - A,B,D Due to steric hinderance of three groups `-NO_2` group go out of the plane with benzene ring and so conjugation of `-NO_2` group with benzene is slightly diminished.So bond length of `C_1-N` & `C_5-N` is more than `C_3-N` |
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| 35. |
What of the following is a transition element ?A. HgB. ZnC. CuD. All of these |
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Answer» Correct Answer - C Element with partically filled d-orbitals are called transition elements. |
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| 36. |
In which of the following pairs the first one is the stronger base than second.A. `CH_3COO^(Theta),HCOO^(Theta)`B. `HO^(Theta),NH_2^(Theta)`C. `CH_2=Coverset(Theta)H: , H-C=overset(Theta)`D. `CH_3NH_2, CH_3OH` |
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Answer» Correct Answer - A,C,D `underset((+I))(CH_3)-oversetoverset(O)(||)C-O^(Theta)gt H-oversetoverset(O)(||)C-O^(Theta)` `CH_2=CH^(Theta)p^2 gt H-C=overset(Theta)C,sp` |
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| 37. |
Which statement among the following are CORRECT ?A. Hydration effect stabilises dimethyl ammonium ion more than trimethyl ammonium ionB. In chlorobenzene as there is no hydration effect so, trimethyl ammonium ion gets less stabilised than dimethyl ammonium ionC. `RCONH_2` is less acidic with respect to RCOOHD. `overset(Theta)CH_3gtoverset(Theta)NH_2gtoverset(Theta)OHgt` is the basicity order |
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Answer» Correct Answer - A,C,D (A)Due to steric hindrance to solvation of conjugate acid (C )Acidity `prop` stability of conjugate base (D)In period `LtoR, K_b` decreases. |
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| 38. |
What is the difference in steric number `(bp + lp)` of anionic and cationic part of `I_(2) (s)` :A. 5B. 4C. 1D. 2 |
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Answer» Correct Answer - C `3I_(2) (s) rarr underset(sp^(3))underset(darr)(I_(3))^(+) + underset(sp^(3)d)underset(darr)(I_(3)^(-)` Steric no. 4 5 |
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| 39. |
What is transduction? |
| Answer» Inserting a vector into viral target cells is called transduction. | |
| 40. |
Which vectors are useful in insects, plants and yeast respectively for biotechnological experiments? |
| Answer» Baculovirus in insects, Ti plasmid in plants and YAC in yeast are useful as vectors for biotechnological experiments. | |
| 41. |
Vehicle’s carrying inflammable materials usually have metallic ropes touching the ground during motion. Why? |
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Answer» When a vehicle moves, its body gets charged on account of friction due to air. The tyres also accumulate the change on account of friction between the tyres and the road. The metallic ropes from the vehicle touching the ground enable the accumulated charges to flow to earth. This would otherwise be hazardous to the inflammable materials. |
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| 42. |
x-ray use in a dental surgery |
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Answer» Dental X-rays (radiographs) are images of your teeth that your dentist uses to evaluate your oral health. These X-rays are used with low levels of radiation to capture images of the interior of your teeth and gums. This can help your dentist to identify problems, like cavities, tooth decay, and impacted teeth. |
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| 43. |
………… is a pungent smelling gas. (a) Ammonia (b) Nitric acid (c) Fluorite (d) Sodium chloride |
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Answer» Ammonia is a pungent smelling gas. |
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| 44. |
The basic structural unit of silicates is (a)(SiO3)2- (b) (SiO4)2- (c) (SiO)- (d) (SiO4)4- |
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Answer» (d) (SiO4)4- |
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| 45. |
Atomic radii of the elements of the second period are given below:Period II elements:BBeONLiCAtomic radius (Pm):88111667415277i. Arrange them in decreasing order of their atomic radii. ii. How does the atomic radius change as you go from left to right in a period? Why? |
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Answer» (i) Li > Be > B > C > N > O (ii) Atomic radius decreases on moving from left to right in a period of the periodic table. It is because force of attraction for the outermost electrons towards nucleus increases because of increased nuclear charge. |
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| 46. |
What is the impact of electronic vehicles on sustainable development? |
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Answer» Electronic vehicles help in protecting environment & also contribute in Saving money and resources |
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| 47. |
Why is upcycling used extensively in sustainable development? |
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Answer» Any product that is not usable can be upcycled with creativity and innovation to give a new look to an old product, this helps in sustainable development. |
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| 48. |
Hibernation is an adaptation for |
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Answer» Hibernation is an adaptation for many mammals and reptiles that allows them to survive much of the winter season. During the coldest winter months, many animals find a place such as a cave or deep burrow where they will hibernate. This keeps them protected from cold temperatures and also from predators. |
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| 49. |
What do you mean by HRM? |
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Answer» Human Resource Management. |
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| 50. |
Hibernation is an adaptation for class6 |
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Answer» Hibernation is an adaptation for many mammals and reptiles that allows them to survive much of the winter season. During the coldest winter months, many animals find a place such as a cave or deep burrow where they will hibernate. This keeps them protected from cold temperatures and also from predators. ans :- Hibernation is the state of dormancy in which the animals conserve energy to survive adverse weather conditions or lack of food. It is also known as winter sleep, as it is used to escape cold weather conditions.
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