H2SO4 + Al(OH)2 \(\to\) 2H2O + AlSO4
3H2SO4 + 2Al(OH)3 \(\to\) 6H2O + Al2(SO4)3
3H2SO4 + 2AlH \(\to\) 6H2O + Al(SO4)3
3H2 SO4 + 2Al(OH)3 \(\to\) Al(SO4)3
H2SO4 + Al(OH)3 \(\to\) H2O + Al2(SO4)3
Correct answer is B
No explanation has been provided for this answer.
The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is
2:1
1:1
1:2
1:4
1:8
Correct answer is A
No explanation has been provided for this answer.
Naphthalene when heated melts at 354 K (81 oC). At this temperature the molecules of naphthalene
decompose into smaller molecules
change their shape
are oxidized by atmospheric oxygen
contract
become mobile as the inter molecular forces are broken
Correct answer is E
No explanation has been provided for this answer.
1 and 2
2 and 3
3 and 4
1, 2, and 3
2, 3, and 5
Correct answer is B
No explanation has been provided for this answer.
A molar solution of caustic soda is prepared by dissolving
40 g NaOH in 100 g of water
40 g NaOH in 1000 g of water
20 g NaOH in 500 of solution
20 g NaOH in 1000 g of solution
20 g NaOH in 80 g of solution
Correct answer is B
A molar solution implies concentration in terms of moles/liter. The respective atomic weights for NaOH are: Na - 23,0 - 16 and H - 1, so the molecular weight, is 23 + 16 + I = 40. Thus 40 grams of NaOH equals one mole of NaOH, and a 1 molar solution of NaOH will contain 40 grams of NaOH chemical in 1000grams of water.