AIIMS Chemistry Some Basic Concepts Of Chemistry Class 11 Questions

A chemical reaction : A + B ⟶ AB, B is acting as limiting reagent then choose the correct option. The limiting reagent is:

Find empirical formula of the compound if $\text{M} = 68\%$ (Atomic mass $= 34$) and remaining $32\%$ oxygen:

Which one of the following is the lightest?

A chemical reaction: $\text{A} + \text{B} \rightarrow \text{AB}$, $\text{B}$ is acting as limiting reagent then choose the correct option. The limiting reagent is: $\quad \text{A} \quad\quad\quad \text{B}$

Assertion : The melting point of trans-isomer is higher than that of corresponding cis-isomer. Reason : trans-isomer being symmetrical fits more closely in the crystal lattice than cis-isomer.

Enantiomers are pairs of molecules that are non-superimposable mirror image of each other. The figure shows all are enantiomer pairs except A and B.

F-centre is

Carbon and oxygen forms two compounds. Carbon content in one of them is 42.9% while in the other is 27.3%. The given data is in support with

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms ($\text{at. Wt. of Fe} = 56$) present in one molecule of haemoglobin is

The label on a bottle of $\text{H}_2\text{O}_2$ solution reads as '10 volume'. The concentration percentage by volume is

A sample of a mixture of $\text{CaCl}_2$ and $\text{Na}_2\text{CO}_3$ weighing $4.22\text{ g}$ was treated to precipitate all the $\text{Ca}$ as $\text{CaCO}_3$. This $\text{CaCO}_3$ is heated and quantitatively converted into $0.959\text{ g}$ of $\text{CaO}$. Calculate the percentage of $\text{CaCl}_2$ in the mixture.(Atomic mass of $\text{Ca} = 40$, $\text{O} = 16$, $\text{C} = 12$ and $\text{Cl} = 35.5$)

If at 298 K, the bond energies of C–H, C–C, C=C and H–H bonds are respectively 414, 347, 615 and 435 kJ mol⁻¹, the value of enthalpy change for the reaction: $$\text{H}_2\text{C}=\text{CH}_2(\text{g}) + \text{H}_2(\text{g}) \rightarrow \text{H}_3\text{C}-\text{CH}_3(\text{g})$$ at 298 K will be:

If $0.5\text{ moles}$ of $\text{BaCl}_2$ is mixed with $0.2\text{ moles}$ of $\text{Na}_3\text{PO}_4$, the maximum number of moles of $\text{Ba}_3(\text{PO}_4)_2$ that can be formed is:

10 mL of liquid carbon disulphide (specific gravity 2.63) is burnt in oxygen. Find the volume of the resulting gases measured at STP.

Carbon and oxygen forms two compound. Carbon content in one of them is 42.9% while in the other is 27.3%. The give data is in support with

The stoichiometry of the following reaction is K2S2O8(aq) + 2KI(aq) → 2K2SO4(aq) + I2(aq)

Assertion Both 106 g of sodium carbonate and 12 g of graphite have same number of carbon atoms. Reason Both 106 g sodium carbonate and 12 g of graphite contain 1 g-atom of carbon atoms.

How much amount of CuSO₄·5H₂O is required for liberation of 2.54 g of I₂ when titrated with KI?

Stomach acid, a dilute solution of HCl in water, can be neutralized by reaction with sodium hydrogen carbonate, NaHCO₃(aq) + HCl(aq) → NaCl(aq) + H₂O(l) + CO₂(g). How many milliliters of 0.125 M NaHCO₃ solution are needed to neutralize 18.0 mL of 0.100 M HCl?

Assertion: S.I. unit of atomic mass and molecular mass is kilograms. Reason: Atomic mass is equal to the mass of 6.023×10²³ atoms.

2.5 g of the carbonate of a metal was treated with 100 ml of 1N H₂SO₄. After the completion of the reaction, the solution was boiled off to expel CO₂ and was then titrated against 1N NaOH solution. The volume of alkali that would be consumed, if the equivalent weight of the metal is 20

Which of the following molecules will not show optical activity?

Percentage of (at. mass = 78.4) in peroxidase anhydrase enzyme is 0.5% by weight, then minimum molecular mass of peroxidase anhydrase enzyme is

Assertion : If H₂ and Cl₂ enclosed separately in the same vessel exert pressure of 100 and 200 mm respectively, their mixture in the same vessel at the same temperature will exert a pressure of 300 mm. Reason: Dalton's law of partial pressures states that total pressure is the sum of partial pressures.

The weight of one molecule of a compound C₆₀H₁₂₂ is

Assertion : Atoms can neither be created nor destroyed. Reason : Under similar condition of temperature and pressure, equal volume of gases does not contain equal number of atoms.

If 0.189 g of a chlorine containing organic compound gave 0.287 g of silver chloride, then the percentage of chlorine in the organic compound is

12 g of an alkaline earth metal gives 14.8 gm of its nitride. Atomic weight of the metal is

Assertion: Maleic acid shows geometrical isomerism. Reason: It has -C= C- bond.