List of top Chemistry Questions on Chemical Reactions

Match the list-I with list-II 

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)
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?
Which of the following is not a chemical change?
Balance the chemical equation: \(\text{Fe} + \text{H}_2\text{O} \rightarrow \text{Fe}_3\text{O}_4 + \text{H}_2\)
Ozone protects Earth because:
Egg yolk solidifies upon heating because:
How would you distinguish between sugar solution and salt solution?
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 oxides is amphoteric in nature?
Consider the following: Statement I: CCl4 does not undergo hydrolysis. But SiCl4 undergoes hydrolysis.
Statement II: Thermal and chemical stability of GeX4 is more than GeX2.
How many grams of calcium carbonate ($\mathrm{CaCO}_3$) are required to completely neutralize 200 mL of 0.5 M HCl? Given the reaction: $$ \mathrm{CaCO}_3 + 2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_2 + \mathrm{H}_2 \mathrm{O} + \mathrm{CO}_2 $$ (Molar mass of $\mathrm{CaCO}_3 = 100 \, \text{g/mol}$)
Which of the following gases is produced when zinc reacts with dilute hydrochloric acid?

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]

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: