• facebook
  • whatsapp
  • telegram

Groups

1. The correct order of ONO bond angles in N2O5, N2O3 and N2O4 are respectively
Ans: N2O5 > N2O3 > N2O4
Sol:
In N2O5 (134°), In N2O3 (130°), In N2O4 (121°)

 

2. The colour of penta aqua nitrosonium iron (I) sulphate is
Ans: Brown
Sol: [Fe(H2O)5 NO]+2 is brown ring

 

3. p-p bond is formed in
Ans: H4P2O6
Sol:

4. Incorrect statement among the following is
     1) N2O3 is blue coloured solid        2) N2O5 is yellow coloured solid
     3) NO is colourless gas                  4) NO2 is brown gas
Ans: 2 (N2O5 is yellow coloured solid)
Sol:    N2O5 is colourless solid

5. Now-a-days catalyst used in the synthesis of NH3 by Haber's process is
Ans: Al2O3 + K2O + Iron Oxide
Sol: Al2O3 + K2O + Iron Oxide is catalyst

 

6. The halide of group 15 elements having lowest boiling point is
Ans: PH3
Sol: B.P. for NH3 (240 K), PH3 (186 K), SbH3 (255 K), Bi H3 (290 K)

 

7. The signs of ∆G, ∆H and ΔS during decomposition of O3 are respectively
Ans: −Ve, −Ve, +Ve
Sol: ∆G = −ve, ∆H = −ve, ∆S = +ve

8. O2 gas is not liberated when O3 reacts with
Ans: C2H4
Sol: C2H4 + O3  C2H4 . O3

 

9. Rhombic Sulphur is readily soluble in
Ans: CS2
Sol:
Rhombic Sulphur is readily soluble in CS2

 

10. Gas/ Gases produced when carbon reacts with conc. H2SO4 is/ are
      1) CO2       2) SO2      3) both CO2 & SO2       4) CO
Ans: 3 (both CO2 & SO2)
Sol:    C + 2 H2SO4 (Conc.)  CO2 + 2 SO2 + 2 H2O

11. A set of amphoteric oxides among the following is
      1) SO2, Cl2O7, N2O5           2) ZnO, PbO, SnO2
      3) Mn2O7, CrO3, V2O5       4) None of the above
Ans: 2 (ZnO, PbO, SnO2)
Sol:     ZnO, PbO, SnO2 are amphoteric

12. S−S bond is formed in
Ans: H2S2O4
Sol:
 

 
13. The oxide used in the estimation of CO is
Ans: I2O5
Sol:
    I2O5 is used in the estimation of CO.

14. The compound used in removing Pu as PuF6 from spent nuclear fuel is
Ans: O2F2
Sol:
Pu + 3 O2F2  PuF6 + 3 O2

15. Arsenic impurities are removed in Arsenic purifier in Contact process by
Ans: gelatinous hydrated Fe(OH)3
Sol:
Gelatinous hydrated Fe(OH)3 removes Arsenic impurities.

 

16. Compound(s) used in the enrichment of U235 to produce UF6 is/ are
       1) ClF3        2) BrF3       3) both ClF3 & BrF3        4) IF7
Ans: 3 (both ClF3 & BrF3)
Sol:
   ClF3 & BrF3 are used to produce UF6
   U + 3ClF3  UF6+ 3 ClF
   U + 3 BrF3  UF6 + 3 BrF

 

17. Which of the following orders is not in accordance with the property stated against it?
       1) ClO− > ClO2− > ClO3− > ClO4 −: acidic nature
       2) F2 > Cl2 > Br2 > I2 : Bond dissociation energy
       3) F2 > Cl2 > Br2 > I2 : Oxidising power
       4) HF > HI > HBr > HCl : Boiling Points
Ans: 2 (F2 > Cl2 > Br2 > I2 : Bond dissociation energy)
Sol:
Bond dissociation energy:
Cl2 (243) > Br2 (193) > F2 (159) > I2 (151 KJmol−1)

 

18. Which of the following reaction is not feasible?
       1) 2 KI + Br2   2 KBr + I2             2) 2 KBr + Cl2  2 KCl + Br2
       3) 2 H2O + 2 F2  4 HF + O2          4) 2 KBr + I2  2 KI + Br2
Ans: 4 (2 KBr + I2  2 KI + Br2)
Sol:
A halogen with less atomic number can only oxidise a halogen with more atomic number.

 

19. Cl2 is not evolved in the reaction
Ans: NaNO2 + HCl 
Sol:
2 NaNO2 + 2 HCl  2 NaCl + NO + NO2 + H2O

 

20. SO2 acts as temporary bleaching agent but Cl2 acts as permanent bleaching agent. Why?
Ans: Cl2 bleaches due to oxidation but SO2 is due to reduction
Sol:
Cl2 + H2O  2 HCl + (O)
SO2 + 2 H2O  H2SO4 + 2 (H)

 

21. S8 on reaction with Cl2 to form a compound X. X is isostructural with
       1) H2O2        2) O2F2       3) both H2O2 & O2F2       4) XeF2
Ans: 3 ( both H2O2 & O2F2)
Sol:
S8 + 4 Cl2  4 S2Cl2 S2Cl2, H2O2, O2F2 all are having open book shape

 

22. When HCl reacts with finely powdered iron, it forms a coloured precipitate. The colour of the precipitate is
Ans: pale green
Sol:
Fe + 2 HCl    FeCl2         +    H2
                            (Pale green)

 

23. The decay products of radium are
Ans: one radioactive inert gas, one nonradioactive inert gas
Sol:
88Ra226  86Rn222 + 2He4

 

24. Neil Bartlett realised that I.E1 of Xe is identical with that of the gas
Ans: O2
Sol:
IE1 of O2 = 1175 KJ mol−1
I.E1 of Xe = 1170 KJ mol−1

 

25. Names of the compounds are formed when 5 times, 20 times of F2 reacts with Xe and excess of the Xe reacts with F2 are respectively
Ans: XeF4, XeF6, XeF2
Sol:

 

26. Number of lone pairs on Xe in XeO3, XeOF4, XeF6, XeF4 and XeF2 are respectively
Ans: 1, 1, 1, 2, 3

Posted Date : 15-10-2020

study-material

Previous Papers

 
 

Model Papers

 

లేటెస్ట్ నోటిఫికేష‌న్స్‌