s is (are exothermic)? 102. Wuch of the following process is (ar нс 10 НЫС н,с Н4С НЫС HC нс (IV) и НЫС

Three beakers labelles as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO_4 and NaCl were added to the breakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions containers in beaker A, and B, where in case of beaker C, the temperature of the solution falls. Which one of the following statements(s) is(are) correct? (i) In beaker A and B, exothermic process has occured. (ii)In beaker A and B, endothermic process has occured. (iii) In beaker C exothermic process as occured. (iv) In beaker C endothermic process has occured.

From the point of the view of significant figures which of the following statements are correct ? (i) 10.2 cm + 8 cm = 18. 2 cm (ii) 2.53 m - 1.2 m = 1.33 m (iii) 4.2 m xx 1.4 m = 5.88 m^(2) (iv) 3.6 m //1.75 sec = 2.1 m//s

From the point of the view of significant figures which of the following statements are correct ? (i) 10.2 cm + 8 cm = 18. 2 cm (ii) 2.53 m - 1.2 m = 1.33 m (iii) 4.2 m xx 1.4 m = 5.88 m^(2) (iv) 3.6 m //1.75 sec = 2.1 m//s

From the point of the view of significant figures which of the following statements are correct ? (i) 10.2 cm + 8 cm = 18. 2 cm (ii) 2.53 m - 1.2 m = 1.33 m (iii) 4.2 m xx 1.4 m = 5.88 m^(2) (iv) 3.6 m //1.75 sec = 2.1 m//s

In equalitative analysis, cations of graph II as well as group IV both are precipitated in the form of sulphides. Due to low value of K_(sp) of group II sulphides, group reagent is H_(2)S in the presence of dil. HC1 , and due to high value of K_(sp) of group IV sulphides, group reagent is H_(2)S in the presence of NH_(4)OH and NH_(4)C1 . In a solution containing 0.1M each of Sn^(2+), Cd^(2+) , and Ni^(2+) ions, H_(2)S gas is passed. K_(sp) of SnS = 8 xx 10^(-29), K_(sp) of CdS = 15 10^(-28), K_(sp) of NiS - 3 xx 10^(-21), K_(1) of H_(2)S = 1 xx 10^(-7), K_(2) of H_(2)S = 1 xx 10^(-14) Which of the following sulphides is more soluble in pure water?

In equalitative analysis, cations of graph II as well as group IV both are precipitated in the form of sulphides. Due to low value of K_(sp) of group II sulphides, group reagent is H_(2)S in the presence of dil. HC1 , and due to high value of K_(sp) of group IV sulphides, group reagent is H_(2)S in the presence of NH_(4)OH and NH_(4)C1 . In a solution containing 0.1M each of Sn^(2+), Cd^(2+) , and Ni^(2+) ions, H_(2)S gas is passed. K_(sp) of SnS = 8 xx 10^(-29), K_(sp) of CdS = 15 10^(-28), K_(sp) of NiS - 3 xx 10^(-21), K_(1) of H_(2)S = 1 xx 10^(-7), K_(2) of H_(2)S = 1 xx 10^(-14) Which of the following sulphides is more soluble in pure water?

How many of the following processes have +ve sign for entropy change? (i) Cl_(2(g)) hArr 2Cl_((g)) (ii) S_(8)("rhombic") hArr 4S_(2(g)) (iii) 3O_(2(g)) hArr 2O_(3(g)) (iv) 60C (graphite ) hArr C_(60(s)) (v) Ag_((aq))^(+) + Br_((aq))^(-) hArr AgBr_((s)) + H_(2)O (vi) H_(2)O_((l)) hArr H_(2)O_((s)) (vii) 2NH_(3(g)) hArr N_(2(g)) + 3H_(2(g)) (viii) CuSO_(4(g)) + 5H_(2)O_((l)) hArr CuSO_(4) .5H_(2)O_((s)) (ix) Ba(OH)_(2).10H_(2)O_((s)) + 2NH_(40Cl_((s))) hArr BaCl_(2(s)) + 2NH_(3(g)) + 12H_(2)O_((l))

Find the number of following reactions which are involved in roasting process : (i) S_(8) + 8 O_(2) overset (Delta)rarr 8SO_(2) uarr (ii) P_(4) + 5O_(2) overset (Delta) rarr P_(4) O_(10) uarr (iii) 4 As + 3O_(2) overset (Delta) rarr 2 As_(2) O_(3) uarr (iv) 2ZnS + 3 O_(2) overset (Delta) rarr 2 ZnO + 2SO_(2) uarr (v) ZnCO_(3) overset (Delta) rarr 4 ZnO + CO_(2) uarr .