Aqueous solutions of which of the following salts will change the colour of blue litmus to red? i) KNO3 ii) (NH4)2SO4 iii) Na2CO3 iv) NH4Cl
(i) only·
(ii) and (iii) only
(ii) and (iv) only
(i)' (ii) and (iv)
Which of the following salts reacts with alkali?
Na2C03
NaHCO3
Na2S04
KN03
Arrange the following compounds in increasing order of pH values. i) Human blood ii) 1 M HCl iii) 1 M NaOH iv) Lemon juice v) Soft drinks
ii< iv < v < i < iii
iii < i < v < iv < ii
ii < v < iv < i < iii
ii < i < v < iv < iii
pH values of two solutions X and Y are 1 and 2 respectively. Which of the following statement is correct?
Hydrogen ion concentration of X is less than that of Y
Hydrogen ion concentration of X is more than that of Y
Acidity of X is less than that of Y
Y is stronger acid that X
Conductivity of an electrolyte depends on the number of ions per unit volume of the electrolyte. Which of the following electrolyte exhibits maximum conductivity?
1M KNO3
1M KCl
1M NaCI
1M Na2CO3
A metal carbonate (X) on thermal decomposition produces a solid residue and a gas (Y). When (Y) is passed through aqueons solution of another substance (Z) gives back X. The compounds X, Y and Z respectively are
Ca(OH)2, CaC03, CO2
Ca(HCO3)2, Ca(OH)2,CaCO3
CaCO3,CO2,Ca(OH)2
CaCO3, CO2,Ca(HCO3)2
A gas (A) obtained at anode during the electrolysis of brine when passed through a substance (B) produces a compound (C) which is used for disinfecting drinking water. A, B and C respectively are
O2 , Ca(OH)2,CaOCl2
H2, CaOCl2, Ca(OH)2
Cl2, Ca(OH)2 , CaOCl2
Cl2, CaOCl2, Ca(OH)2
Match the following:
pH of a solution is 12. Identify the wrong statement about this solution.
It changes colour of red litmus to blue
It reacts with acids to form salt
Hydrogen ion concentration is greater than hydroxyl ion concentration
Hydrogen ion concentration is less than hydroxyl ion concentration
pOH values of four solutions A, B, C and D are 2, 8,13, 4 respectively. Arrange them in decreasing order of acidity.
C>B>D>A
A> D > B > C
C>D>B>A
C > A > B > D
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