Potassium Dichromate
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Q. For the reaction N2O4(g) Image not present 2NO2(g) the degree of dissociation is 0.2 at equilibrium and 1 atm pressure then equilibrium cons†an t Kp will be :-
Q. What will be the pH change when 0.01 moles of CH_3COONa is added in 1 litre 0.02 M CH_3COOH solution ? K_a for CH_3COOH is 1.8 x 10^{-5 } (1) 1.22 (2) 1.82 (3) 1.07 (4) 0.37
Q. At a certain temperature, equilibrium constant (Kc) is 16 for the reaction; SO2(g) + NO2(g) ⇋ SO3(g) + NO(g) If we take one mole of each of all the four gases in a one litre container, what would be the equilibrium concentrations of NO
Q. the pKa of HNO_2 IS 3.37.The pH of HNO_2 in its 0.01 mol/l aqueous solution will be 1.5.37 2.2.69 3.1.69 4.0.69
Q. Which of the following combinations will make a buffer solutions?(i) CH3COONa (2 mol) + HCl (1 mol)(ii) CH3 COOH (2 mol) + NaOH (1 mol)(ii) CH3COOH (1 mol) + CH3COONa (1 mol)(1) (iii)(2) (i), (ii)(3) (ii), (iii)(4) (i), (ii), (ii)
Q. If we treat a solution of Sodium dichromate with KCl, the orange crystals that crystallize out is:
- Sodium Chloride
- Sodium oxide
- Sodium chromate
- Potassium Dichromate
Q. If for the dissociation of NH2COONH4(s), Kp is 32 atm3 then equilibrium pressure is
Q. The equilibrium constant, Kp for the reaction, 2NOCl(g) <-----> 2NO(g) + Cl2(g)
is 6.95*10^-8 at 298K. The standard Gibbs free energy change, ΔG° at 298K will be (R=2calK^-1mole^-1) (log6.95=0.8420)
(a) 4.912 kcal
(b) 14.74 kcal
(c) 7.3 kcal
(d) 9.825 kcal
Q. 25. Calculate the pH of 0.625M solution of CH3COOH is (ka for CH3COOH is 1.754 into 10 to the power minus 5) A)8.25. B)9.28 C )10.2. D) 11.26
Q. 2. assuming complete dissociation which of the following aqueous solutions will have the same ph value as of 50 ml , 0.01M HCL ? 1 100 ml .0.01 M H2SO4 2 50 ml 0.01M H2PO4 3 100 ml 0.01M HCl 4 mix of 50 ml 0, 005 M HCl and 50 ml 0.0 M H2SO4
Q. 41. Draw all resonatic structure of Azide ion
Q. 22. What are the numbers of p pi_p pi bond and p pi _ d pi bond in clo4- respectively ?
Q. 63. Explanation of oxide ion, peroxide ion and super oxide ion
Q. HOW MANY S-S BONDS , S-O-S BONDS , SIGMA BONDS , PI BONDS ARE PRESENT IN TRIMER OF SULPHAR TRIOXIDE
Q. In salts of Co, Sb, Sn & Cd, H2S was added, Thecolour of the precipitates obtained were as follou2blackyelloworangebrownAВCDWhich set is correct for its colour of its sulphide:-(1) A-Co(2) B-Sb(3) C-Sn(4) D-Cd
Q. 22. Kc= 4.24 at 800k for co(g)+H2O------> CO2+H2 calculate equilibrium conc. For all if initial conc. Of CO & H2O is 0.10M
Q. 49 Determine the value of equilibrium constant for the reaction A + B = 2C If 1.0 mol. Of A , 1.4 mol. Of B , and 0.50 mol. Of C are placed in a 1.0 L vessel and allowed to come to equilibrium. The final concentration of C is 0.75 mol/L.
Q. all bonds are identical i 1.pcl5 2.B2H6 3. C2H6 4.PF3
Q. If pk_b for CN^- at 25^0C is 4.7, the pH of 0.5M NaCN solution is (Given 10^{-0.17 }=0.67
Q. What is line spectrum of hydrogen?
Q. When SO2 is passed through an acidic solution of potassium dichromate, chromium sulphate is formed. The change in oxidation number of chromium is:
- +6 to +2
- +6 to +3
- +5 to +3
- +6 to +4
Q. In the reaction Cu3P+K2Cr2O7+H2SO4→CuSO4+H3PO4+Cr2(SO4)3+H2O.
What is the n-factor of Cu3P?
What is the n-factor of Cu3P?
- 8
- 3
- 11
- 1
Q. The Ksp of Al(OH)3 is 2.7*10-11. Calculate the solubility in gL-1 and also find out the pH of this solution.
Q. 82 Why is (Ph)3C free radical less stable than allyl free radical?
Q. Write the balanced chemical equation for the possible reactions of super oxide of potassium during inhalation and exhalation.
Q. The following equilibria are given
N
2
+3H
2
⇌2NH
3
, K
1
N
2
+O
2
⇌2NO, K
2
H
2
+
2
1
O
2
⇌H
2
O, K
3
The equilibrium constant of the reaction, in terms of K
1
, K
2
and K
3
is:
2NH
3
+
2
5
O
2
⇌2NO+3H
2
O
Q. A mixture contains 0.05 moles each of CH3COONa and CH3COOH. Its pH will be (pKa of CH3COOH = 4.74)
Q. At 90^° C, pure water has \lbrack H2O\rbrack = 10-6 moL L-1. What is the value of K, at 90^° C?(1) 10-6(2) 1012(3) 10-144)10-1216. The degree of dissociation of 0.1 M CH.COOH will be equal to(Given: K(CH2COOH) = 1x10)(1) 10-5(2) 10-4(3) 10-3(410-217ther havingpH = 4 are mixed. The pH of thefo
Q. How many grams of K2Cr2O7 are present in 1 L of its N10 solution in acid medium?
Q. What would be the the mass of NaOH added to 200ml of a 0.10M HOBr solution to produce a buffer of solution of pH8.3 (K_a of HOBr=2×10^{-9}):- (1)3.67g (2)0.37g (3)0.037g (4)3.07g