Reactivity with Halogens (Group 1)

Q.

Write the three conditions for the formation of ionic bonds.

Q. The value of specific conductivity is maximum for (1)0.1M NaCl (2)0.01M NaCl (3)10-4M NaCl (4)all will have same specific conductivity

Q. Which property of white phosphorus is common to red phosphorus?

1. It reacts with hot caustic soda sloution to give phosphine
2. It shows chemiluminescene
3. It is soluble in carbon disulphide
4. None of the above

Q. A mixture of two bivalent metals weighing $2g(M_A=15,M_B=30)$ is dissolved in $HCl$ to evolve $2.24L{H}_2$ at $STP$. What is the mass of metal $A$ present in the mixture?

1. $1g$
2. $1.5g$
3. $0.5g$
4. $0.75g$

Q. 16. Calculate molar conductivities for NH4OH that values of molar conductivity for Ba(OH)2, BaCl2&NH4Cl as 523.28 , 280 &129.8 S cm2 per mole explain with proper solution

Q.

Of the following sets which one does NOT contain isoelectronic species

1. 

2. 

3. 

4. 

Q.

When $C{l}_2$ gas is passed through hot and conc. solution of KOH, following compound is formed

1. KCl

2. KClO₃

3. KClO₂

4. KClO₄

Q.

What happens to molar conductivity when one mole of kcl is dissolved in one litre is diluted to five litres?

Q.

Which of the following is/are correct about ionic hydrides?

1. They are good conductors of electricity in fused state

2. They are good reducing agents

3. They are more densely packed than their parent metals

4. The crystal structures of ionic hydrides show no evidence of directional bonding

Q.

A substance X when heated with conc. H₂SO₄, liberates a gas which turns moist starch paper blue. The substance X is:

1. NaBr

2. NaCl

3. NaNO₃

4. NaI

Q.

Assign the reason for the following observation:

Common salt becomes sticky during the rainy season.

Q. Calculate the mass of iron which will be converted into its oxide by the action of $18g$ of steam on it:

1. $37.3g$
2. $3.73g$
3. $56g$
4. $5.6g$

Q. The number of water molecule in 1 litre of water is

Q. Household H2O2 is an aqueous solution containing 3.0% H2O2 by mass. What is the molarity of this solution? (Density - 1.01)

Q.

Which is more ionic $\mathrm{NaCl}\mathrm{or}\mathrm{RbCl}$?

Q.

What are the different processes of crystallization?

Q. 29. Which of the following is expected to have highest value of molar conductance at infinite dilution in aqueous solution 1)Na+ 2)K+ 3)H+ 4)Ca+2

Q.

Explain why, $\mathrm{NaCl}$ is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state.

Q.

Define Crystallisation.

Q. One liter of CO2 react with coke to form a gaseous mixture of 1.4L. Then find the volume of CO2 and CO in the fixed mixture??

Q. which of the following does not decolourise iodine? a)Na2SO3 b)Na2S2O3 C)NaCl d)NaOH

Q. Among $LiCl,RbCl,$ $BeC{l}_2$ and $MgC{l}_2$ which two are the highest and the lowest ionic compounds?

1. $LiCl$ & $RbCl$
2. $RbCl$ & $BeC{l}_2$
3. $RbCl$ & $MgC{l}_2$
4. $MgC{l}_2$ & $BeC{l}_2$

Q. What would you observe on adding dilute hydrochloric acid to solid sodium carbonate placed in a test tube?

Q. Chlorine atom in $NaCl$ gets a unit negative charge:

1. its nucleus has $18$ protons, $17$ electrons
2. its nucleus has $17$ protons, $18$ electrons
3. none of the above
4. its nucleus has $8$ protons, $7$ electrons

Q.

state why LiCl is soluble in alcohol while Nacl is not

Q. Assertion :$NaCl$ is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state. Reason: In solid $NaCl$, the ions have fixed positions in the lattice structure and there are no free ions but in aqueous solution or molten state, the ions can move freely and thus conduct electricity.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. __________ is called impure sodium chloride.

1. Gypsum salt
2. Rock salt
3. Carbonate salt
4. Rochel salt

Q.

Define Hygroscopy.

Q. Molten sodium chloride conducts electricity due to the presence of:

1. free electrons
2. free molecules
3. free ions
4. atoms

Q. Which of the following statement is false regarding sodium?

1. It forms metallic bonds in its solid uncombined form
2. It reacts with a halogen to form an ionic salt
3. It is found in nature as a diatomic gas
4. It takes the oxidation state +1
5. It reacts with water to form a basic solution