Download App

1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
A sample of a hydrate of barium chloride weighing $61\,g$ was heated until all the water of hydration is removed. The dried sample weight is $52\,g.$ The formula of the hydrated salt is : ( atomic mass, $Ba = 137\,amu,\,\,Cl = 35.5\,amu$ )
  • A
    $BaC{l_2}.4{H_2}O$
  • B
    $BaC{l_2}.3{H_2}O$
  • C
    $BaC{l_2}.{H_2}O$
  • ✓
    $BaC{l_2}.2{H_2}O$
✓

Answer

Correct option: D.
$BaC{l_2}.2{H_2}O$
d
Weight of hydrated $BaCl_2 = 61\,g$

Weight of anhydrous $BaCl_2 = 52\,g$

Loss in mass $= 9\,g$

Assuming $BaCl_2.xH_2O$ as hydrate mass of $H_2O = 9\,g$

Moles of ${{H}_{2}}O=\frac{9}{18}=0.5$

Grass molecular let of $BaCl_2 = 208$

$\%$ of $H_2O$ in this hydrated $BaC{{l}_{2}}=\frac{9}{61}\times 100$

$=14.75\%$

$=\frac{18x}{208+18x}\times 100$ on solving $x = 2$

This percentage is present in $BaCl_2.2H_2O$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 1. Some basic concept of chemistry→1. Some basic concept of chemistry — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The compound most likely to decolourize a solution of potassium permanganate is
→
Thomson's atomic model concluded that $ ......... $ is the constituent particle of all kinds of atoms.
→
Which of the following is the correct order of chemical reactivity with water according to electrochemical series?
→
Rank the following substances in decreasing order of heat of combustion (most  exothermic $\to$ least exothermic)
→
Which of the following hybridisation has highest percentage of $s-$character
→
The ratio of the mass percentages of $'C$ $\&$ $H'$ and $'C$ $\&$ $O'$ of a saturated acyclic organic compound$'X'$ are $4 : 1$ and $3 : 4$ respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound $'X$' is
→
The mass of $2.24 \times 10^{-3}m^{3}$ of a gas is $4.4g$ at $273.15K$ and $101.325 \text{ kpa}$. pressure. The gas may be :
→
If $A$ is $[Rn]\,6d^2\,7s^2$ then identify block, period, group?
→
$20\,mL$ of $0.1\,M\,NH _{4} OH$ is mixed with $40\,mL$ of $0.05\,M\,HCl$. The $pH$ of the mixture is nearest to.(Given: $K _{ b }\left( NH _{4} OH \right)=1 \times 10^{-5}, \log 2=0.30$,$\log 3=0.48, \log 5=0.69, \log 7=0.84$,$\log 11=1.04)$
→
Consider the above reaction where $6.1 \,g$ of benzoic acid is used to get $7.8\, g$ of $m$ -bromo benzoic acid. The percentage yield of the product is ....... .

(Round off to the Nearest integer) [Given : Atomic masses : $C =12.0 \,u , H : 1.0\, u,O : 16.0 \,u , Br =80.0 \,u ]$

→