The mass of glucose that should be dissolved in SO g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is :
1 g
3 g
6 g
18 g
Osmotic pressure observed when benzoic acid is dissolved in benzene is less than that expected from theoretical considerations .This is because :
benzoic acid is an organic solute
benzoic acid has higher molar mass than benzene
benzoic acid gets associated in benzene
benzoic acid gets dissociated in benzene
Which of the following electrolyte will have maximum flocculation value for Fe(OH)3 sol ?
NaCl
Na2S
(NH4)3PO4
K2SO4
A.
NaCl
Flocculation value
Fe(OH)3 is a positively charged sol
To coagulate Fe(OH)3 -ve charged electrolyte is used and greater the value of -ve charge ,coagulating power will be strong .Among the given electrolytes , NaCl has lowest coagulating power .So , its flocculation value will be maximum .
For a reaction A + B C + D if the concentration of A is doubled without alterning the concentration of B , the rate gets doubled . If the concentration of B is increased by nine times without alterning the concentration of A , the rate gets tripled .The order of the reaction is :
2
1
3/2
4/3
Denatured alcohol is :
ethanol + methanol
rectified spirit + methanol + naphtha
undistilled ethanol
rectified spirit
Hofmann's bromamide reaction is used to convert :
acid to alcohol
alcohol to acid
amide to amine
amine to amide
An alkyl halide reacts with alcoholic ammonia in a sealed tube , the product formed will be :
a primary amine
a secondary amine
a tertiary amine
a mixture of all the three
The product formed when hydroxylamine condenses with a carbonyl compound is called :
hydrazide
oxime
hydrazine
hydrazone