Which of the following is the electron dedicient molecule?
B2H6
C2H6
PH3
SiH4
Oxidation numbers of P in PO43-, of S in SO2-4 and that of Cr in CrO2-7 are respectively,
+5, +6 and +6
+3, +6 and +5
+5, +3 and +6
-3, +6 and +6
PH4I + NaOH forms
NH3
P4O6
P4O10
Which among the following is paramagnetic?
Cl2O
ClO2
Cl2O7
Cl2O6
The substance used as a smoke screen in warfare is
SiCl4
PCl5
acetylene
Which of the following statement is false?
Strontium decomposes water readily than beryllium
BaCO3 melts at a higher temperature than CaCO3
Barium hydroxide is more soluable in water than Mg(OH)2
Beryllium hydroxide is more basic than barium hydroxide
Regarding F-and Cl- which of the following statement is/are correct?(i)Cl- can give up an electron more easily than F-(ii)Cl- is a better reducing agent than F-(iii)Cl- is smaller in size than F-(iV)F- can be oxidised more readily than Cl-
(i) and (ii)
(i), (ii) and (iv)
(iii) and (iv)
only (i)
Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?
Cl
Br
Al
Na
Oleum is
castor oil
oil of vitriol
fuming H2SO4
None of these
The correct order of acid strength is
HClO<HClO2<HClO3<HClO4
HClO4<HClO<HClO2<HClO3
HClO2<HClO3<HClO4<HClO
HClO4<HClO3<HClO2<HClO
