EAMCET Chemistry Important Questions with Answers

1) Aqueous solution of NH4X is acidic in nature, ‘X’ would not be
1) OH 2) Cl 3)Br 4) I

2) The molarity of 20% (W/W) NaOH solution is 5M. The density of the solution is —— g/ml.
1) 0.5 2) 0.25 3) 1.0 4) 2.0

3) The freezing point of equimolal aqueous solutions will be highest for
1) C6H12O6 2) NaCl 3) MgCl2 4) Al2(SO4)3

4) Which of the following when added to ammonia buffer brings about greater change in its pH
1) HCl 2) NaOH 3) Water 4) NH4OH

5) At 300 K the solute in 0.1M K4 [fe(CN)6] solution is 100% ionised. The osmotic pressure of the solution is
1) 12.3 atm 2) 14.778 atm 3) 21.01 atm 4) 0.7389 atm

6) The value of hydrolysis constant of Sodium acetate is (Ka of acetic acid is 2 × 10-5)
1) 5 × 10-9 2) 5 × 10-10 3) 2 × 10-9 4) 2 × 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
1) 2 2) 4 3) 3 4) 5

8) Both the cation and the anion interact with water in the aqueous solution of the following salt
1) HCOOK 2) NH4Cl 3) CH3COONH4 4) CSI

9) 100 ml of solution contains 34.2 gm of Aluminium sulphate. The molarity of the solution is
1) 6M 2) 8M 3) 1 M 4) 0.6M

10) When HCl gas is passed through NaCl saturated solution, NaCl is precipitated. This is due to
1) Common ion effect 2) Solution process
11) 'x' g Na2CO3 is present in 100 ml 'y' M Na2CO3 solution. The ratio of x and y is
1) 10.6 2) 1.06 3) 5.3 4) 0.53

12) The molality and molarity of an agueous solution are 1.0 m and
0.75 M respectively. The weight of solvent present in 10ml of that solution is
1) 7.5 g 2) 0.75 g 3) 75 g 4) 750 g

13) For an aqueous solution density is less than 1g/ ml. The relation between its molarity (M) and molality (m) is
1) M = m 2) m > M 3) m < M 4) m < < M 14) At certain high temperature TK, pH of 0.05 M Ba(OH)2 is 11.6990. At TK, ionic product of water is 1) 10-14 M2 2) 10-13 M2 3) 2 × 10-14 M2 4) 4 × 10-14 M2 15) Read the following statements I) For the Salt Ag2 S3Ksp = 108S5 II) Among IIA Group hydroxides Be(OH)2 has lowest Ksp at 25oC III) The Molar solubility of PbI2 in 0.2 M Pb(NO3)2 solution interms of ‘Ksp’ is (Ksp/0.8)1/2 1) All 2) I, II 3) III only 4) II, III 16) When equal volumes of following solutions are mixed, then precipitation of AgCl will occur only with (Ksp of Agcl = 1.8 × 10-10) 1) 10-4M Ag+1 and 10-4 MCl- 2) 10-5M Ag+1 and 10-5MCl- 3) 10-6M Ag+1 and 10-6MCl- 4) 10-10M Ag+1 and 10-10MCl- 17) A small amount of HCl, is added to a butter containing acitic acid and sodium acetate. Which of the following reaction is responsible for constant pH of the solution? 1) CH3COOH ←→ CH3COO- + H+ 2) CH3COONa → CH3COO- + Na+ 3) CH3COO- + H+ → CH3COOH 4) H+ + OH- ←→ H2O 18) Which of the following 0.1 M solutions will have lowest pH? 1) CH3COOH 2) HCl 3) NH4OH 4) KOH 19) ‘X’ L of 10N HCl and ‘Y’ L of 2M HCl are mixed. Molarity of resultant solution is ‘Z’. X, Y and Z are respectively. 1) 1.5, 2.5, 3.5 2) 5, 10, 5 3) 6, 6, 6 4) 2.5, 1.5, 5 20) Which of the following are not correct A) Cl- is a Lewis acid B) pH of 10-3M HCl is 3 C) In acid solution pH < POH D) Bronsted - Lowry theory fails to explain basic nature of NH3 1) A, B 2) B, C 3) A, D 4) B, D. KEY : 1.1 2.3 3.1 4.4 5.1 6.2 7.2 8.3 9.3 10.1 11.1 12.1 13.2 14.3 15.1 16.1 17.3 18.2 19.3 20.3.

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