Decomposition Reaction

Q. What is meant by stationary phase and mobile phase in chromatography?

Q.

What is the reaction of the decomposition of Calcium carbonate?

Q. Difference between:
(a) Reactants and products

Q.

In electrolysis of water (acidified), the gases that are evolved at anode and cathode respectively are _________ and _______.

1. Hydrogen and oxygen

2. Oxygen and hydrogen

3. Hydrogen and chlorine

4. Chlorine and oxygen

Q. A reddish brown gas is released on heating lead nitrate. The type of reaction involved here is:

1. combination reaction
2. displacement reaction
3. decomposition reaction
4. double displacement reaction

Q.

Which compound is used as a catalyst in the process of decomposition of potassium chlorate to prepare oxygen?

1. Potassium chloride

2. Vanadium pentoxide

3. Manganese dioxide

4. Magnesium oxide

Q. e) Name a non-metal that is used for filling into electric bulbs.​

Q.

Compound X in crystal form, taken in a dry test tube is heated to give ferric oxide and two sulphur based gases. The compound X is:

1. Ferrous sulphate

2. Ferric sulphate

3. Ferric oxide

4. Ferrous oxide

Q. Write ‘true’ or ‘false’ for the following statements :-​

(a) Silver is used to make electric cables.​ ​

1. False
2. True

Q.

The reaction in which a single product breaks down to give simpler products is called ___ reaction.

Q. During a chemical reaction, transfer of takes place.

Q.

What do you observe when:

• Copper carbonate is heated strongly.

Q. splitting of single reactant into two or more simpler products is called --------------

Q.

Give two uses of ​

(d) Germanium.​

Q.

The decomposition reaction in which cooling is involved is called thermal decomposition.

1. True

2. False

Q.

The reaction in which a single product breaks down to give simpler products is called __ reaction.

Q. Give reason :​
(c) Copper is used in making electric cables.​

Q. Double displacement reaction causes the exchange of _____ between the reactants.

1. ions
2. solutions
3. atoms
4. compounds

Q. what is the reaction of decomposition of (NH4)2SO2 ??

Q. Breaking of lead bromide into lead and bromine is an example of _____.

1. decomposition reaction
2. synthesis reaction
3. displacement reaction
4. neutralisation reaction

Q.

Electrolysis of water is a --------- reaction.

Q. Which of the following reactions is a decomposition reaction?
(a) CaCO₃ ⟶CaO + CO₂
(b) AgNO₃ + NaCl ⟶ AgCl + NaNO₃
(c) CuO + 2HCl ⟶ CuCl₂ + H₂O
(d) C + O₂ ⟶ CO₂

Q. Formation of water from hydrogen and oxygen is an example of _________ reaction.

1. precipitation
2. displacement
3. combination
4. decomposition

Q. Acids react with carbonate to give:

1. $C{O}_3$
2. $C{O}_2$
3. $CO$
4. all of the above

Q. KmnO4on treatment with conc H2SO4 forms a compound X which decomposes explosively on heating forming Y , what is X & Y

Q.

$FeC{l}_3+3NaOH⟶Fe(OH{)}_3+3NaCl$.

The given reaction is an example of :

1. simple displacement reaction
2. direct combination reaction
3. decomposition reaction
4. double displacement reaction

Q.

The given reaction is a type of:​

${\mathrm{CaCO}}_3\left(s\right)\to \mathrm{CaO}\left(s\right)+{\mathrm{CO}}_2\left(g\right)$

1. Decomposition reaction​

2. Double displacement reaction​
3. Displacement reaction​
4. Combination reaction​

Q. The phenomenon of formation of simple sugar from starch in our body is the example of which reaction?

1. Decomposition
2. Reduction
3. Redox
4. Combination

Q. Precipitates are _____ substances.

1. little soluble
2. soluble
3. insoluble
4. readily soluble

Q. Who performed the gold-foil experiment?

1. Max Planck
2. John Dalton
3. Niels Bohr
4. Ernest Rutherford