How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]
10.0 g
4.0g
2.0 g
1.0g
0.1 g
Correct answer is D
no of moles of Na = molar concentration X volume
= 0.1 x \(\frac{250}{1000}\) = 0.025
no of moles = \(\frac{m}{M}\)
mass = no of mles x molar mass = 0.025 x 40 = 1.0g ( molar mass of NaOH = 40g/mol)
1:01
1:01
2:01
2:03
3:01
Correct answer is A
No explanation has been provided for this answer.
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
3
9
10
18
32
Correct answer is D
No explanation has been provided for this answer.
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
black
blue
green
white
yellow
Correct answer is A
No explanation has been provided for this answer.
Which compound is a product of the hydrolysis of the of CH3COOC3H7 with aqueous sodium hydroxide?
CH3COOH
CH3COONaCCH3OH
CH3OH
C2H5OH
C3H7COONa
Correct answer is A
No explanation has been provided for this answer.