Write balanced chemical equations :
Beryllium oxide is treated separately with aqueous HCl and aqueous NaOH solutions.
1 Answers
Talk Doctor Online in Bissoy App
When 100 mL each of HCl and NaOH solutions are mixed, 5.71 kJ of heat was evolved. What is the molarity of two solution? The heat of neutralisation of
Correct Answer - 1M
2 Answers 1 views
If 20g of `CaCO_(3)` is treated with 20g of HCl. How many grams of `CO_(2)` can be generated according to the following equations? `CaCO_(3)+2HCl(aq)
`underset(100g)underset("1 mol")(CaCO_(3))+underset(73g)underset("2 mol")(2HCl(aq)) to CaCl_(2)(aq.)+H_(2)O(l)+underset(44g)underset("1 mol")(CO_(2)g)` Let `CaCO_(3)(s)` be completely consumed in the reaction. `therefore 100g CaCO_(3) "give" 44gCO_(2)` `therefore 20g CaCO_(3)"will give" (44)/(100)xx20g CO_(2)=8.8CO_(2)` Let HCl be completely consumed....
2 Answers 1 views
The two aqueous solutions, `A (AgNO_3)` and `B (LiCI)`, were electrolysed using Pt electrodes. The `pH` of the resulting solutions will.
Correct Answer - D `AgNO_(3)` At cathode: `Ag^(+)+e^(-)toAg(s)` At anode: `2H_(2)OtoO_(2)+4H^(+)+4e^(-)` `therefore` at cathode pH will increase.
2 Answers 1 views
The pH of 0.1 M `NaHCO_(3)` solution at `25^(@)C` is 9. A 220 ml of 0.2 M solution of `H_(2)CO_(3)` when treated with 80 ml of 0.5 M NaOH results into
Correct Answer - A `{:(,P(g),+,2Q(g),iff,R(g)+S(g).,k_(p)=10^(12),,),(,2,,5,,-,-,,),("At eq.",2-x,,5-2x=1,,x=2,x=2,,),(,((2)^(2))/((P)(1)^(2))=10^(12),,,,P=4xx10^(-12),,,):}`
2 Answers 1 views
nNaOCl is also known as household bleach and it is prepared by following reaction: `NaOH+Cl_(2)rarrNaOCl+NaCl+H_(2)O` How much NaOH is required to pro
`2NaOH+Cl_(2)rarrNaOCl+NaCl+H_(2)O` `n_(NaOH)"required"=2xxn_(NaOCl)` `(W_(NaOH))/(40)=2xx(372.5)/(74.5)=10` `W_(NaOH)=400gm`
2 Answers 1 views
In amixure of NaOH and NaCl 50% sodium is present. Calculate mass % of NaOH in the solution.
In 100gm mixture contain `W_(Na)=50gm` `n_(NaOH)=a, n_(NaCl)=b` 40a+58.5b=100 . . . .(i) `axx23+bxx23=50gm` `a+b=(50)/(23)` . . . .(ii) `40a+40b=(50xx40)/(23)` 40a+58.5b=100 `18.5b=100-(200)/(23)` `b=(100-86.9)/(18.5)=0.7`. `a=(50)/(23)-0.7=2.17-0.7` In 100 gm mixture `rArr W_(NaOH)=58.8rArr58.8%` approx.
2 Answers 1 views
Which oxide of iron is formed when iron is treated with steam?
Option : A. Fe3O4
2 Answers 1 views
(i) What happens when: (a) Borax is heated strongly (b) Boric acid is added to water ( c) Aluminium is treated with dilute `NaOH`. (d) `BF_(3)` is rea
Correct Answer - (i)(a)When borax is heated strongly, a transparent glassy bead which consists of sodium metaborate `(NaBO_(2))` and boric anhydride is formed. `Na_(2)B_(4)O_(7). 10H_(2)Ooverset(Delta)toNa_(2)B_(4)O_(7)+10H_(2)O uar r` `Na_(2)B_(4)O_(7)overset(740^(@)C)to 2NaBO_(2)+underset("borax bead")(B_(2)O_(3))`...
2 Answers 1 views
Complete and balance the following chemical equations. (i)`BrO_(3)^(-)+F_(2)+H_(2)Oto` (ii)`F_(2)+NaOH ("dilute & conc.) to` (iii)`NaOH (aq) ("hot and
Correct Answer - (i)`F_(2)+ BrO_(3)^(-) + H_(2)Oto2F^(-) + BrO_(4)^(-) + 2H^(+)` (ii)`2F_(2)+2NaOH("dilute")toOF_(2) (g) + 2 NaF + H_(2)O` `2F_(2)+4NaOH("conc.")toO_(2) (g) + 4 NaF + 2H_(2)O` (iii)`2NaOH+undeset("cold & dilute")(Cl_(2))toNaCl + NaCIO...
2 Answers 1 views
`Na_(2)CO_(3),NaCl, NaNO_(2),Na_(2)SO_(3),NaBr,CH_(3)CO O Na` are separately treated with `AgNO_(3)` solution. In how many cases white precipitate is/
Correct Answer - 5 (All except NaBr)
2 Answers 2 views