01:05

OQV NO – 329 What are the monomer units of Buna-S?

01:48

OQV NO – 328 What is the effective atomic number (EAN) of Fe in [Fe(CN)6]4-?

02:17

OQV NO – 327 Calculate the cell constant of the cell whose specific conductance is 0.011 ohm-1cm-1.

02:03

OQV NO – 326 Reaction of Ph-NO2 first with Sn/HCl then with NaNO2/HCl and then with KI.

01:01

OQV NO – 325 The reaction between phosphorus trichloride(PCl3) and oxygen(O2).

00:51

OQV NO – 324 Axial ratio a = b = c axial angle α = β = γ = 900 crystal system.

02:06

OQV NO – 323 Diazotisastion of aromatic amine at pH ≈ 1.

01:03

OQV NO – 322 The reaction between magnesium(Mg) and nitrogen(N2).

01:44

OQV NO – 321 What is the percentage composition of iron (Fe) in the compound Fe3O4

01:45

OQV NO – 320 The reagent for the transformation of butanone to butane.

00:59

OQV NO – 319 How many S=O bonds are present in oleum(H2S2O7)?

01:56

OQV NO – 318 Calculate the number of molecules in 2 grams of oxygen.

01:21

OQV NO – 317 The acetylene gas is passed through a red-hot iron tube at 6000C.

01:46

OQV NO – 316 Determination of the oxidation number of Cr in CrO5.

02:19

OQV NO – 315 Which is an example of a heterogeneously catalysed reaction?

01:10

OQV NO – 314 What are the monomer units of terylene?

01:25

OQV NO – 313 14Si30 15P31 16S32 Are isotopes isobars isotones or nuclear isomers?

00:51

OQV NO – 312 In a closed system which is or are exchanged with the surroundings?

02:04

OQV NO – 311 What is the product of the reaction of glyoxal (OHC-CHO) with 50% NaOH and H3O+?

01:09

OQV NO – 310 Reaction of calcium carbide(CaC2) with nitrogen(N2).

02:17

OQV NO – 309 What are units of rate constant (k) for a reaction whose rate equation is rate = k[A]2.

01:11

OQV NO – 308 What is the product of the reaction between formaldehyde and concentrated H2SO4?

02:53

OQV NO – 307 The bond order and magnetic property of He2+ ion.

01:56

OQV NO – 306 What is the coordination number of Zn2+ ions in the ZnS ionic crystal? Radius ratio.

01:32

OQV NO – 305 Reaction Of Grignard reagent (CH3-MgBr) with cyano chloride (N≡CꟷCl).

01:13

OQV NO – 304 10Ne20 10Ne21 10Ne22 These are isotones nuclear isomers isobars or isotopes?

00:52

OQV NO – 303 In an open system which is exchanged with the surroundings?

02:04

OQV NO – 302 Reaction of propene first with HBr peroxide and then with NaCN.

01:46

OQV NO – 301 How many unpaired electrons are in the Ni2+ ion?

02:52

OQV NO – 300 Relationship between equilibrium constant for reactions 2SO2+O2↔2SO3 and SO2+1/2O2↔SO3.

01:31

OQV NO – 299 Reaction Of Grignard reagent (CH3-MgBr) with NH2-Cl.

01:28

OQV NO – 298 The products of the reaction are when sulfur(S) is heated with caustic soda(NaOH).

01:50

OQV NO – 297 Calculation of the entropy change for the reaction 2SO2 (g) + O2(g) → 2SO3(g).

01:03

OQV NO – 295 How many geometrical isomers are possible for the complex [Pt(NH3)2Cl2].

00:48

OQV NO – 294 Crystal system with axial ratio a = b ≠ c and axial angle α = β = γ = 900.

02:11

OQV NO – 293 What is the R/S nomenclature of the compound CH3-CHOH-CH2-CH3?

01:07

OQV NO – 292 What happens when boric acid (H3BO3) is boiled with soda ash(Na2CO3)?

02:15

OQV NO – 291 Calculate the average velocity of O2 gas at 300 K.

01:00

OQV NO – 290 Reaction of cyclohexene with SO2Cl2 in the presence of peroxide and light.

03:01

OQV NO – 289 92U235 emits first 4 α-particles and then 1 β-particle so what is the newborn element?

02:07

OQV NO – 288 Which is an example of a homogeneously catalysed reaction?

01:52

OQV NO – 287 CH3CN first reacts with H2O2 and NaOH and then with Br2 NaOH and H2O.

02:07

OQV NO – 286 Calculate the velocity of an electron placed in the 1st orbit of the He+ ion.

02:05

OQV NO – 285 What volume of 0.4 (M) NaOH is needed to neutralize 50 ml of 0.2 (M) HCl?

01:24

OQV NO – 283 What happens when water (H2O) is added to calcium phosphide (Ca3P2)?

02:09

OQV NO – 282 Calculate the most probable velocity of O2 gas at 300 K.

01:33

OQV NO – 281 The reaction of vinyl chloride (H2C=CH―Cl) with HCl.

02:50

OQV NO – 280 Calculate the crystal field stabilization energy of coordination entity [Co(H2O)6]2+.

02:35

OQV NO – 279 Calculate the pH of pure water at 1000C.

02:08

OQV NO – 278 What is the D/L nomenclature of this compound CH3-CHOH-CHOH-CH3?

01:25

OQV NO – 277 The products of the reaction when sulfur powder is heated with caustic potash.

02:17

OQV NO – 276 What is the value of the Vant Hoff factor for CaCl2 if it is 75% dissociated?

01:56

OQV NO – 275 Reaction of Ph-CH=CH-NO2 with H2 in the presence of (Ph3P)3RhCl (Wilkinson’s catalyst)

01:11

OQV NO – 274 Among 8O16 6C13 5B10 and 3Li7 which is odd-odd nuclei?

01:37

OQV NO – 273 Miller indices of crystal plane which cut through the crystal axes at 1/2:3:1

01:43

OQV NO – 272 For the compound Cl-CH=CH-Cl which form is more stable (cis or trans)?

03:00

OQV NO – 271 Which is the correct set of quantum numbers?

02:23

OQV NO – 270 If initial concentration is doubled the half-life of reaction is doubled so the order—

01:02

OQV NO – 269 Which glycosidic linkage is present in maltose?

02:19

OQV NO – 268 The order of basicity of CH3- NH2- OH- and F-.