Which one of the following substances conducts electricity by the movement of ions ?
A. Graphite
B. Copper
C. Molten sodium chloride
D. Mercury
S-BLOCK ELEMENTS
The ore CaSO4.H2O has the general name_______________?
The ore CaSO4.H2O has the general name_______________?
A. Gypsum
B. Dolomite
C. Calcite
D. Plaster of Paris
Which of the following sulphates is not soluble in water ?
Which of the following sulphates is not soluble in water ?
A. Sodium sulphate
B. Potassium sulphate
C. Zinc sulphate
D. Barium sulphate
Nitrates of which pair of elements give different products on thermal decomposition ?
Nitrates of which pair of elements give different products on thermal decomposition ?
A. Na K
B. Mg Ca
C. Li Na
D. Li Ca
Which element is necessary for normal leaf development ?
Which element is necessary for normal leaf development ?
A. Si
B. Ba
C. Mg
D. Ca
The word Alkali means__________________?
The word Alkali means__________________?
A. Base
B. Basic salt
C. Ashes
D. Spirit
Which one is least ionic in nature and decompose on heating ?
Which one is least ionic in nature and decompose on heating ?
A. LiOH
B. NaOH
C. KOH
D. CsOH
Which one is natron ?
Which one is natron ?
A. Na2CO3
B. Na2CO3.10H2O
C. Na2CO3.H2O
D. NaHCO3
Which ion will have maximum value of heat of hydration ?
Which ion will have maximum value of heat of hydration ?
A. A1+3
B. Cs+
C. Ba+
D. Mg+2
Electrolysis of dilute solution of NaCl results at the anode_______________?
Electrolysis of dilute solution of NaCl results at the anode_______________?
A. sodium
B. hydrogen
C. chlorine
D. oxygen