Preparation and Properties and Uses of Potassium Hydroxide

Q.

In the electrolysis of water,

a) Name the gas collected at the anode and cathode

b) Why is the volume of gas collected at one electrode double than the other?

c) What would happen if dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$ is not added to water?

Q.

The solubility of Ba(OH)₂.8H₂O in water at 288 K is 5.6g per 100 g of water. What is morality of hydroxide ions in saturated solution of barium hydroxide at 288 K?(atomic masses:Ba - 137, O-16, H-1)

Q.

calculate the molality of the solution of $C{}_{2}H{}_{5}OH$ in water in which the mole fraction of $C{}_{2}H{}_{5}OH$ is 0.050

Q. 1000 g aqueous solution of CaCO3 contains 10 g of calcium carbonate. Concentration of the solution is: (1) 10 ppm (2) 100 ppm (3) 1000 ppm (4) 10000 ppm

Q.

A white powder is added while baking bread and cakes to them soft and fluffy. What is the name of the powder? What are the functions of each ingredient?

Q. 48. The limiting molar conductivity of kcl, kno3, Agno3 , are 14.99, 14.50, 13.34 respectively at 25^° C the limiting molar conductivity of Agcl at this temperature will be

Q. Which one of the following has the highest molar conductivity ? (1) Diamminedichloroplatinum(II) (2) Tetraamminedichlorocobalt(III) (3) Potassium hexacyanoferrate(II) (4) Hexaaquochromium(III)bromide

Q. Lithium has maximum hydration but it is least soluble in water due to its covalent nature. what does this mean? also if lithium salts are not soluble in h2o why does LiCl always exist as LiCl.2h2o?

Q.

Write the formula and two uses of baking soda?

Q.

Explain giving reasons;

Tartaric acid is a component of baking powder used in making cakes.

Q. ntThe degree of dissociation of HI at a particular temperature is 0.8. Find the volume of 1. 5M sodium thiosulphate solution required to react completely with the iodine present at equilibrium in acidic conditions, when 0.135 mol each of H2 and I2 are heated at 440 K in a closed vessel of capacity 2.0 L.n

Q. Predict the proportions of isomeric prod-ucts from chlorination at room temperature of (a) 2-Methylb-utane, (b) 2, 3-Dimethylbutane. Relative reactivities of 3^° , 2^° and 1^° Hs for chlorination is 5.0 : 3.8 : 1.0.Cu

Q. 82 11.1 mg cacl2 and 9.5 mg Mgcl2 in 10L container. what will be the hardness?

Q.

Sn when fused with $NaOH$ will form.

$Sn+NaOH\to$ _____ $+H_2$

1. Na₂SnO₃

2. Na₂SnO₂

3. Na₂SnO₄

4. Na₂SnO

Q. A certain sample of cuprous is found to habeeb composition Cu1. 8 S, because incorporation of Cu2+ Ions in the lattice. What is the mole % of Cu2+ in total Cooper content in this crystal?

Q.

Name the following:

(i) The scum is formed when permanent hard water containing magnesium ions reacts with soap.

(ii) A sodium salt that removes both temporary and permanent hardness.

(iii) The organic acid whose sodium salt is the constituent of soap.

Q.

How does hydrogen react with the following? write the equation for each and give the experimental conditions.

(A) Sodium

(B) Sulphur

(C) Chlorine

Q. The weakest base among the following is

1. 
2. NaOH
3. KOH
4. 

Q.

Classify the following into strong bases and weak bases:

$\mathrm{Mg}{\left(\mathrm{OH}\right)}_2,\mathrm{NaOH},\mathrm{Ca}{\left(\mathrm{OH}\right)}_2,{\mathrm{NH}}_4\mathrm{OH},\mathrm{KOH}$

Q. KF combines with HF to form $KH{F}_2.$ The compound contains the species-

1. $K^{+},H^{+},and{F}^{-}$
2. $K^{+},F^{-},andH{F}^{-}$
3. $K^{+},and[H{F}_2{]}^{-}$
4. $[KHF{]}^{+},and{F}^{-}$

Q. Correct order of acidic strength is :

1. $Na-O-H>K-O-H>Rb-O-H$
2. $Na-O-H<K-O-H<Li-O-H$
3. None of these
4. $H-OK>HO-Rb>Na-O-H$

Q. The average concentration of So2 in the atoms over a city on a certain day is 10ppm when the average temperature is 298K.Given that the solubility of So2 in water at 298K is 1.3653 moles per litre and the Pka of H2SO3 is 1.92 estimate the ph of rain on that day.

Q.

In the Electrolysis of Acidulated Water, ______ gas is evolved at cathode

Q.

The highest conductivity for molten salt & aqueous salt of IIA group cations are respectively

1. Ba⁺², Ba⁺²

2. Mg⁺², Ba⁺²

3. Mg², Mg⁺²

4. Ca⁺², Mg⁺²

Q.

KF(aq) + HF(aq) $\leftrightarrow$ A ions. The ions are _____

1. K⁺, F^- and HF

2. K⁺ and HF₂^-

3. (KHF)⁺ and F^-

4. 

Q. The most basic hydroxide among those of alkali metals is :

1. $LiOH$
2. $NaOH$
3. $CsOH$
4. $KOH$

Q. Equivalent mass of H3PO4 for the given, H3PO4+Ca(OH)2------CaHPO4+2H2O is

Q. Statement 1: $LiOH$ is considered a strong base.
Statement 2: It undergoes neutralization reactions with acids.

1. Both Statement 1 and Statement 2 are correct, but Statement 2 is NOT the correct explanation of Statement 1.
2. Statement 1 is not correct, but Statement 2 is correct.
3. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.
4. Statement 1 is correct, but Statement 2 is not correct.

Q. 25 g of Na2CO3 is dissolved in enough water to make 250 ml solution . if Na2CO3 dissociates completely molar concentration of Na+ and CO3 2- carbonate ions are ?

Q. calculate the molality of solution of C_2H_5OH in water in which the mole fraction of C_2H_5OH is 0.050.