List of top Chemistry Questions

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.
What is the volume of oxygen required for complete combustion of 0.25 mole of methane at S.T.P.?
In the reaction \( 2 \, \text{H}_2 + \text{O}_2 \rightarrow 2 \, \text{H}_2\text{O} \), how many moles of water are produced when 4 moles of hydrogen react with excess oxygen?
How many molecules of carbon dioxide are formed when 0.6 g carbon is burnt in air?
What is the number of moles of oxygen atoms in 4.0 g of \( \text{O}_2 \)?
How many grams of sodium chloride (NaCl) are produced when 2.0 moles of sodium (Na) react with excess chlorine gas (Cl\(_2\)? The balanced chemical equation for the reaction is: \[ 2 \, \text{Na} (s) + \text{Cl}_2 (g) \rightarrow 2 \, \text{NaCl} (s) \]
In the reaction \( \mathrm{2H_2 + O_2 \rightarrow 2H_2O} \), if 4 moles of hydrogen react completely with oxygen, how many moles of water will be produced?
In the reaction \( 2 \, \text{H}_2 + \text{O}_2 \to 2 \, \text{H}_2\text{O} \), if 4 moles of hydrogen react completely with oxygen, how many moles of water will be produced?
What volume of oxygen gas at STP is required to completely burn 12 g of methane (\( \text{CH}_4 \))? (Molar mass of \( \text{CH}_4 = 16 \, \text{g/mol} \), 1 mole of gas at STP occupies \( 22.4 \, \text{L} \)).
What is the mass of sodium chloride (\( \text{NaCl} \)) formed when 0.5 moles of sodium (\( \text{Na} \)) reacts with excess chlorine (\( \text{Cl}_2 \))?
What is the volume of oxygen required for complete combustion of 0.25 mole of methane at S.T.P.?
What is the mass of 0.5 moles of water (H$_2$O)?
The compound(s) showing optical activity is/are
An LPG (Liquified Petroleum Gas) cylinder weighs 15.0 kg when empty. When full, it weighs 30.0 kg and shows a pressure of 3.0 atm. In the course of usage at 27°C, the mass of the full cylinder is reduced to 24.2 kg. The volume of the used gas in cubic metre at the normal usage condition (1 atm and 27°C) is (assume LPG to be normal butane and it behaves ideally):


Consider the above reaction, what mass of CaCl₂ will be formed if 250 ml of 0.76 M HCl reacts with 1000 g of CaCO₃?

Among the following, choose the ones with an equal number of atoms.

  1. 212 g of Na2CO3 (s) [molar mass = 106 g]
  2. 248 g of NaNO3 (s) [molar mass = 62 g]
  3. 240 g of NaOH (s) [molar mass = 40 g]
  4. 12 g of H2 (g) [molar mass = 2 g]
  5. 220 g of CO2 (g) [molar mass = 44 g]

Choose the correct answer from the options given below:

10 g of (90 percent pure) \( \text{CaCO}_3 \), treated with excess of HCl, gives what mass of \( \text{CO}_2 \)?
How many oxygen atoms are present in 0.36 g of a drop of water at STP?
The number of moles of CO$_2$ produced when 2 moles of C$_2$H$_6$ are completely burnt is:
How many moles of oxygen are required to completely combust 1 mole of propane (C\(_3\)H\(_8\))?

How many moles of \(\mathrm{CO_2}\) are produced when 4 moles of \(\mathrm{C_2H_6}\) (ethane) combust completely? 
Given reaction: \[ 2 \mathrm{C_2H_6} + 7 \mathrm{O_2} \rightarrow 4 \mathrm{CO_2} + 6 \mathrm{H_2O} \]

What volume of CO$_2$ gas at STP is produced by the reaction of 10 g of CaCO$_3$ with excess HCl?
How many atoms are present in 1 mole of oxygen gas (O2)?
How many grams of $ \text{CO}_2 $ are produced when 10 g of $ \text{C}_2\text{H}_6 $ (ethane) is completely combusted? Reaction: $ 2\text{C}_2\text{H}_6 + 7\text{O}_2 \rightarrow 4\text{CO}_2 + 6\text{H}_2\text{O} $
What is the number of moles in 88 grams of carbon dioxide (CO2)?