Chemical Reactivity (Group 1)

Q.

On heating ${\mathrm{NaNO}}_3$ gives-

Q. The pair of compounds which cannot exist together in solution is

1. NaHCO₃ and NaOH

2. NaHCO₃ and H₂O

3. NaHCO₃ and Na₂CO₃

4. Na₂CO₃ and NaOH

Q. On heating in air, sodium burns violently with golden yellow flame forming

1. Monoxide and chloride

2. Monoxide and carbonate

3. Peroxide and hydroxide

4. Monoxide and peroxide

Q. Account for the following: (1) CH3CHO is more reactive with HCN than CH3COCH3. (2) Carboxylic acids are stronger acids than phenol.

Q.

Assertion (A): Sodium metal is stored in kerosene

Reason (R): The density of sodium is less than water

1. A is true, R is false

2. A and R are true and R is the correct explanation of A

3. A and R are true and R is not the correct explanation of A

4. A is false, R is true

Q. A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively
(IIT-JEE, 1987)

1. $H_2,O_2$
2. $O_2,H_2$
3. $O_2,Na$
4. $O_2,S{O}_3$

Q. Compare the acidic character of 2-nitrophenol, 3-nitrophenol & 4-nitrophenol. Is this valid for all the compounds showing Intramolecular Hydrogen Bonding?

Q. Which is not correctly matched?
(1) Basic strength of oxides. $C{s}_{2}O<R{b}_{2}O<K_{2}O<N{a}_{2}O<L{i}_{2}O$
(2) Stability of peroxides. $N{a}_2{O}_2<K_2{O}_2<R{b}_2{O}_2<C{s}_2{O}_2$
(3) Stability of bicarbonates. $LiHC{O}_3<NaHC{O}_3<KHC{O}_3<RbHC{O}_3<CsHC{O}_3$
(4) Melting point. $NaF<NaCl<NaBr<Nal$

1. 1 and 4
2. 1 and 3
3. 2 and 3
4. 1 and 2

Q.

The scientist who prepared hydrogen by the action of dilute acids on metals:

1. Cavendish

2. Joseph Black

3. Priestley

4. Scheele

Q.

Chemical reactions take place by the action of light energy are called ______________.

Q.

Chemical reactions that take place by the action of light energy are called photochemical reactions.

1. True
2. False

Q.

$2NaN{O}_3+10Na\to$ ______ $+N_2$

$2NaN{O}_2+6Na\to$ ______$+N_2$ The product obtained is as follows.

1. 

2. 

3. 

4. 

Q. On heating, $NaN{O}_3$ gives:

1. $O_2$
2. $N{O}_2$
3. $O_2+N{O}_2$
4. $NaN{O}_2$

Q. If true enter 1, else enter 0.
${Li}^{+}$ is the smallest cation among alkali metals with highest ionization energy but ${Li}^{+}$ is strongest reducing agent in aqueous medium due to higher heat of hydration.

Q.

$4B+3O_2\to A$

$2B+N_2\to B$

$A\&B$ are as follows

1. BO, BN₂

2. B₂O, BN

3. B₂O₃, BN

4. B₂O, BN₂

Q. The oxidation state of Na, K, Rb respectively in $N{a}_2{O}_2,K{O}_2,Rb{O}_2$ is :

Q. Calcium carbonate reacts with aqueous $HCl$ to give ${CaCl}_2$ and ${CO}_2$ according to the reaction,

Q. Which one of the following alkaline earth metal carbonates is thermally the most stable?

1. $MgC{O}_3$
2. $CaC{O}_3$
3. $SrC{O}_3$
4. $BaC{O}_3$

Q. Sodium amalgam is used as:

1. oxidising agent.
2. catalyst.
3. reducing agent.
4. bleaching agent.

Q. Which of the following statement(s) is/are true?

$Z{n}^{2+}\left(aq\right)+2e^{-}\to Zn\left(s\right);E^0=-0.76V$
$C{u}^{2+}\left(aq\right)+2e^{-}\to Cu\left(s\right);E^0=0.34V$

1. $CuS{O}_4$ can be stored in $Zn$ pot
2. $ZnS{O}_4$ can be stored in $Cu$ vessel.
3. Both (a) and (b)
4. $Zn$ will displace $Cu$ from its salt solution.

Q. why lithium unlike other alkali metals doesnt form ethynide?

Q. Catalyzed by iron, alkali metals dissolve in liquid ammonia to yield:

1. Metal amide

2. $Fe.(N{H}_4{)}^x$

3. $H_2$
4. Iron hydride

Q. If 3 moles of oxygen combines with aluminium the weight of aluminium used in the reaction

Q. Which of the following is the lightest metal?

1. Silver
2. Lead
3. Lithium
4. Mercury

Q.

The reaction of sodium is highly exothermic with H₂O. The rate of reaction is lowered by

1. Lowering the temperature

2. Mixing with alcohol

3. Mixing with acetic acid

4. Making an amalgam

Q.

State the type of chemical reactions of the

$2\mathrm{AgBr}\left(\mathrm{s}\right)\stackrel{\mathrm{sunlight}}{\to }2\mathrm{Ag}\left(\mathrm{s}\right)+{\mathrm{Br}}_2\left(\mathrm{l}\right)$

Q. Assertion :Elements of group I are called 'alkali metals'. Reason: All the alkali metals react with water.

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. The alkali metal which forms hydrate of chloride salt is:

1. $Li$
2. $Rb$
3. $Cs$
4. $Na$

Q. Li+Li+ has greatest reducing nature. True or false :

1. True
2. False