Base strength of
is in the order of
(2) > (1) > (3)
(3) > (2) > (1)
(1) > (3)> (2)
(1) > (3)> (2)
What volume of oxygen gas (O2) measured at 0oC and 1 atm, is needed to burn completely 1 L of propane gas (C3H8) measured under the same conditions?
7 L
6 L
5 L
5 L
Equimolar solutions of the following were prepared in water separately which one of the solutions will record the highest pH?
SrCl2
BaCl2
MgCl2
MgCl2
The measurment of the electron position is associated with an uncerrtanity in momentum, which equal to 1 x 10-18 g cm s-1.The uncertanity in electron velocity is,
(mass of an electrons is 9 x 10-28 g)
1 x 108
1 x 106 cm s-1
1 x 105 cm s-1
1 x 105 cm s-1
Four diatomic solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?
An Organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be
CH3O
CH2O
CHO
CHO
A.
CH3O
Element | % | At. wt | Relative no. of atoms | Simplest ratio of atoms |
C | 38.71 | 12 | 3.23 | 3.23/3.23 = 1 |
H | 9.67 | 1 | 9.67 | 9.67/3.23 = 3 |
O | 51.62 | 16 | 3.23 | 3.23/3.23 |
How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?
0.044
0.333
0.011
0.011
Bond dissociation enthalpy of H2, Cl2 and HCl and 434, 242 and 431 kJ mol-1 respectively. Enthalpy of formation of HCl is
93 kJ mol-1
-245 kJ mol-1
-39 kJ mol-1
-39 kJ mol-1
The dissociation equilibrium of gas AB2 can be represented as
2AB2 (g) ⇌ 2AB (g) + B2 (g)
The degree of dissociation is 'x' and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant Kp and total pressure p is
(2Kp / p)
(2Kp/p)1/3
(2Kp/p)1/2
(2Kp/p)1/2