35.4 ml of HCl is required for the neutralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is ?
0.97 N
0.142 N
0.194 N
0.244 N
The value of amu is which of the following ?
1.57 × 10-24 kg
1.66 × 10-24 kg
1.99 × 10-23 kg
1.66 × 10-27 kg
Which one of the following has unit positive charge and 1 amu mass ?
Electron
Neutron
Proton
None of these
Which one of the following pair shows Buffer's solution?
NaCl + NaOH
CH3COONa + CH3COOH
CH3COOH + CH3COONH4
H2SO4 + CuSO4
B.
CH3COONa + CH3COOH
Buffer's solutions are the solutions which resists the chnages in its pH value on addition of small amount of a base or an acid.
Among all the given options, CH3COOH and CH3COONa are the example of Buffer's solutions because they are the combination of weak acid and salt of strong base.
By dissolving 5 g substance in 50 g of water, the decrease in freezing point is 1.2°C. The gram molal depression is 1.85°C. The molecular weight of substance is :
105.4
118.2
137.2
154.2
The correct sequence of hybridisation of methane, ethene and acetylene is :
sp, sp2, sp3
sp2, sp3, sp
sp3, sp2, sp
sp3, sp, sp2