Multiple Choice QuestionsThe correct statement regarding the following energy diagrams is
Reaction M is faster and less exothermic than reaction N
Reaction M is slower and less exothermic than reaction N
Reaction M is faster and more exothermic than reaction N
Reaction M is slower and more exothermic than reaction N
At 25°C, the solubility product of salt of MX2 type is 3.2 × 10-8 in water. The solubility (in mol/L) of MX2 in water at the same temperature will be
1.2 × 10-3
2 × 10-3
3.2 × 10-3
1.75 × 10-3
The different colours of litmus in acidic, neutral and basic solutions are, respectively.
red, orange and blue
blue, violet and red
red, colourless and blue
red, violet and blue
The correct order of equivalent conductances at infinite dilution in water at room temperature for H+, K+, CH3COO- and HO- ions is
HO- > H+ > K+ > CH3COO-
H+ > HO- > K+ > CH3COO-
H+ > K+ > HO- > CH3COO-
H+ > K+ > CH3COO- > HO-
For a chemical reaction at 27°C, the activation energy is 600 R. The ratio of the rate constants at 327°C to that of at 27°C will be
2
40
e
e2
In basic medium the amount of Ni2+ in a solution can be estimated with the dimethylglyoxime reagent. The correct statement(s) about the reaction and the product is (are)
in a ammoniacal solution Ni2+ salts give cherry-red precipitate of nickel (II) dimethylglyoximate
two dimethylglyoximate units are bound to one Ni2+
in the complex two dimethylglyoximate units are hydrogen bonded to each other
each dimethylglyoximate unit forms a six membered chelate ring with Ni2+
A.
in a ammoniacal solution Ni2+ salts give cherry-red precipitate of nickel (II) dimethylglyoximate
B.
two dimethylglyoximate units are bound to one Ni2+
C.
in the complex two dimethylglyoximate units are hydrogen bonded to each other
D.
each dimethylglyoximate unit forms a six membered chelate ring with Ni2+
Estimation of Ni2+ is carried out as.
Filtrate of group III + NH4OH + NH4Cl passing H2S gas → black ppt of NiS (it is soluble in conc. HCl in presence of oxidising agent like KClO3)
NiS + 2HCl + O → NiCl2 + H2O + S
When NiCl2 in basic medium, treated with dimethyl glyoxime, a cherry red ppt of nickel (II) dimethyl glyoximate is obtained. It consists of 2 dimethyl glyoximate units which are hydrogen bonded to each other and each unit forms a 6-membered ring with Ni2+.
1 x 10-3 mole of HCl is added to a buffer solution made up of' 0.01 M acetic acid and 0.01 M sodium acetate. The final pH of the buffer (given, pKa of acetic acid is 4.75 at 25°C)
4.60
4.66
4.75
4.8
Short Answer TypeIn 'x' mL 0.3 N HCl, addition of 200 mL distilled water or addition of 100 mL 0.1 N NaOH, gives same final acid strength. Determine 'x'.
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