NEET Chemistry Some Basic Concepts Of Chemistry Class 11 Questions

Among the following, choose the ones with equal number of atoms. A. 212 g of Na₂CO₃ (s) [molar mass = 106 g] B. 248 g of Na₂O (s) [molar mass = 62 g] C. 240 g of NaOH (s) [molar mass = 40 g] D. 12 g of H₂ (g) [molar mass = 2 g] E. 220 g of CO₂(g) [molar mass = 44 g] Choose the correct answer from the options given below :

The highest number of helium atoms is in

1 gram of sodium hydroxide was treated with 25 mL of 0.75 M HCl solution, the mass of sodium hydroxide left unreacted is equal to

A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is: (Given atomic masses of A = 64; B = 40; C = 32 u)

Which one is an example of heterogeneous catalysis?

Select the correct statements from the following: A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electron is 9.10939 × 10−31 kg. C. All the isotopes of a given element show same chemical properties. D. Protons and electrons are collectively known as nucleons. E. Dalton’s atomic theory, regarded the atom as an ultimate particle of matter. Choose the correct answer from the options given below:

The <strong>right</strong> option for the mass of CO₂ produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40) <div style="margin:8px 0;text-align:center;"> <span style="display:inline-block;position:relative;"> CaCO₃ <span style="display:inline-block;position:relative;margin:0 8px;">―――→<span style="position:absolute;top:-18px;left:50%;transform:translateX(-50%);font-size:0.85em;">1200 K</span></span> CaO + CO₂ </span> </div>

What mass of 95% pure CaCO₃ will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction? CaCO₃ + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + 2H₂O(l) [Calculate upto second place of decimal point]

Which one of the followings has maximum number of atoms?

In which case is the number of molecules of water maximum?

A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H₂SO₄. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be

Which is the INCORRECT statement?

A mixture of gases contains H₂ and O₂ gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?

1.0 g of magnesium is burnt with 0.56 g O₂ in a closed vessel. Which reactant is left in excess and how much? (At wt. Mg = 24; O = 16)

When 22.4 litres of H₂(g) is mixed with 11.2 litres of Cl₂(g), each at S.T.P, the moles of HCl(g) formed is equal to

It was observed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO₃, which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine)?