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Solutions & Acids - Bases

1. Aqueous solution of NH4X is acidic in nature, ‘X’ would not be the following-
   OH, Cl, Br, I
Ans:  OH

 

2. The molarity of 20% (W/W) NaOH solution is 5 M. The density of the solution is-
Ans:  1.0 g/ml

 

3. The freezing point of equimolal aqueous solutions will be highest for -
Ans:  C6H12O6

 

4. Which of the following when added to ammonia buffer brings about greater change in its pH -
HCl, NaOH, Water, NH4OH 
Ans:  NH4OH

 

5. At 300 K the solute in 0.1 M K4 [Fe(CN)6] solution is 100% ionised. The osmotic pressure of the solution is -
Ans:  12.3 atm

 

6. The value of hydrolysis constant of Sodium acetate is (Ka of acetic acid is 2 × 10-5) -
Ans:  5 × 10-10

 

7. The pH of a buffer solution changes by 0.1 unit on the addition of 4 grams of NaOH. The buffer capacity is -
Ans:  4

 

8. Both the cation and the anion interact with water in the aqueous solution of the following Salt-
HCOOK, NH4Cl, CH3COONH4, CSI
Ans:  CH3COONH4

 

9. 100 ml of solution contains 34.2 gm of Aluminium sulphate. The molarity of the solution is -
Ans:  1 M

 

10. When HCl gas is passed through NaCl saturated solution, NaCl is precipitated. This is due to -
Ans:  Common ion effect

 

11. 'x' g Na2CO3 is present in 100 ml 'y' M Na2CO3 solution. The ratio of x and y is -
Ans:  10.6

 

12. The molality and molarity of an agueous solution are 1.0 m and 0.75 M respectively. The weight of solvent present in 10 ml of that solution is -
Ans:  7.5 g

 

13. For an aqueous solution density is less than 1 g/ ml. The relation between its molarity (M) and molality (m) is -
Ans:  m > M

 

14. At certain high temperature TK, pH of 0.05 MBa(OH)2 is 11.6990. At TK, ionic product of water is -
Ans:  2 × 10-14 M2

 

15. Read the following statements
I) For the Salt Ag2S3 Ksp = 108S5
II) Among IIA Group hydroxides Be(OH)2 has lowest Ksp at 25°C.
III) The Molar solubility of PbI2 in 0.2 M Pb(NO3)2 solution in terms of ‘Ksp’ is [Ksp/0.8]1/2
Ans:  All three

 

16. When equal volumes of following solutions are mixed, then precipitation of AgCl will occur only with (Ksp of AgCl = 1.8 × 10-10)-
Ans:  10-4 M Ag+1 and 10-4 MCl-

 

17. A small amount of HCl, is added to a buffer containing acitic acid and sodium acetate.    The following reaction is responsible for constant pH of the solution?
Ans:  CH3COO+ H+ --> CH3COOH

 

18. Which of the following 0.1 M solutions will have lowest pH?
CH3COOH, HCl, NH4OH, KOH
Ans:  HCl

 

19. ‘X’ L of 10 N HCl and ‘Y’ L of 2 M HCl are mixed. Molarity of resultant solution is ‘Z’. X, Y and Z are respectively?
Ans:  6, 6, 6

 

20. Which of the following are not correct
A) Cl - is a Lewis acid
B) pH of 10-3 M HCl is 3
C) In acid solution pH < pOH
D) Bronsted - Lowry theory fails to explain basic nature of NH3
Ans:  A, D

Posted Date : 15-10-2020

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గమనిక : ప్రతిభ.ఈనాడు.నెట్‌లో కనిపించే వ్యాపార ప్రకటనలు వివిధ దేశాల్లోని వ్యాపారులు, సంస్థల నుంచి వస్తాయి. మరి కొన్ని ప్రకటనలు పాఠకుల అభిరుచి మేరకు కృత్రిమ మేధస్సు సాంకేతికత సాయంతో ప్రదర్శితమవుతుంటాయి. ఆ ప్రకటనల్లోని ఉత్పత్తులను లేదా సేవలను పాఠకులు స్వయంగా విచారించుకొని, జాగ్రత్తగా పరిశీలించి కొనుక్కోవాలి లేదా వినియోగించుకోవాలి. వాటి నాణ్యత లేదా లోపాలతో ఈనాడు యాజమాన్యానికి ఎలాంటి సంబంధం లేదు. ఈ విషయంలో ఉత్తర ప్రత్యుత్తరాలకు, ఈ-మెయిల్స్ కి, ఇంకా ఇతర రూపాల్లో సమాచార మార్పిడికి తావు లేదు. ఫిర్యాదులు స్వీకరించడం కుదరదు. పాఠకులు గమనించి, సహకరించాలని మనవి.

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