List of top Chemistry Questions on Chemical Reactions

Name the following:
(a) The most electronegative element of Period 2
(b) The largest atom of Period 3

Complete the following sentences by choosing the correct option from the brackets:
(a) The oxide that dissolves in caustic potash (KOH) is [ZnO / CuO]
(b) The reaction that takes place at the anode during the electrolysis of molten lead bromide is [2Br(^-) () Br(_2) + 2e(^-) / 2Br(^-) + 2e(^-) () 2Br(^-)]
(c) The volume occupied by 8 grams of oxygen gas at STP is ______ litres. [15 / 8.96] [Atomic weight of O = 16]
(d) ______ does not give hydrogen gas when it reacts with cold and very dilute nitric acid. [Cu / Mn]
(e) ______ is a polar covalent compound [HCl / CCl(_4)]

Match Column A with Column B:

Identify the following terms / compounds:
(a) A compound which reacts with water to give acetylene gas.
(b) The gas evolved when sodium propanoate is heated with soda lime.
(c) A reddish-brown precipitate formed when ferric chloride solution reacts with an alkali.
(d) A pair of electrons present in an atom which is not shared with any other atom during bond formation.
(e) The relative molecular mass of a substance expressed in grams.

The compound that has the highest melting point amongst the following is:

Rita added dilute hydrochloric acid to four metals. She recorded her observations in the table given below. While noting her observations she made some errors.

A non-metal which reacts with concentrated sulphuric acid to form two gases which turn lime water milky is ______.

What happens when an iron nail is dipped in copper sulfate solution? Write with equation.

In the following reaction, which substance is oxidized and which is reduced?
$4\text{Na} + \text{O}_2 \rightarrow 2\text{Na}_2\text{O}$

Why are packets of oily or fatty foods flushed with nitrogen gas?

Balance the chemical equation: $\text{Fe} + \text{H}_2\text{O} \rightarrow \text{Fe}_3\text{O}_4 + \text{H}_2$

Which of the following is not a chemical change?

One mole of Cl$_2$(g) was passed into 2 L of cold 2 M KOH solution. After the reaction, the concentrations of Cl$^-$, ClO$^-$ and OH$^-$ are respectively (assume volume remains constant)

For a reaction, $$ {N}_2{O}_5(g) \rightarrow 2{NO}_2(g) + \frac{1}{2} {O}_2(g) $$ in a constant volume container, no products were present initially. The final pressure of the system when 50% of the reaction gets completed is:

Identify A, B, and C in the given reaction sequence: \[ \text{A} \xrightarrow{\text{HNO}_3} \text{Pb(NO}_3)_2 \xrightarrow{\text{H}_2\text{SO}_4} \text{B} \rightarrow \text{C (Yellow ppt)}. \]

Which of the following gases is produced when zinc reacts with dilute hydrochloric acid?

Given below are two statements: Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms.
Statement (II): The boiling points of alcohols and phenols are higher in comparison to other classes of compounds such as ethers and haloalkanes. In the light of the above statements, choose the correct answer from the options given below:

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is ___________%. [Given: Molar mass in g mol$^{-1}$ of Ag = 108, Cl = 35.5]

The species which does not undergo disproportionation reaction is:

Consider the following reaction occurring in the blast furnace. \[ {Fe}_3{O}_4(s) + 4{CO}(g) \rightarrow 3{Fe}(l) + 4{CO}_2(g) \] ‘x’ kg of iron is produced when $2.32 \times 10^3$ kg $Fe_3O_4$ and $2.8 \times 10^2 $ kg CO are brought together in the furnace.
The value of ‘x’ is __________ (nearest integer).

X g of benzoic acid on reaction with aqueous $NaHCO_3$ release $CO_2$ that occupied 11.2 L volume at STP. X is ________ g.

Arrange the following compounds in increasing order of their reactivity towards $ S_N2 $ displacement: 2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane.

In the following pair of halogen compounds, which compound undergoes $ S_N1 $ reaction faster and why?

Assertion (A): Aromatic primary amines cannot be prepared by Gabriel Phthalimide synthesis.
Reason (R): Aryl halides do not undergo nucleophilic substitution reaction with the anion formed by phthalimide.

What is the major product when 1-bromopropane undergoes nucleophilic substitution with $OH^-$?