Science (English Medium) कक्षा ११ - CBSE Question Bank Solutions for Chemistry

Which of the carbonates given below is unstable in air and is kept in CO₂ atmosphere to avoid decomposition.

Present a comparative account of the alkali and alkaline earth metals with respect to the following characteristics:

(i) Tendency to form ionic/covalent compounds

(ii) Nature of oxides and their solubility in water

(iii) Formation of oxosalts

(iv) Solubility of oxosalts

(v) Thermal stability of oxosalts

The IUPAC name for \[\begin{array}{cc}
\phantom{.}\ce{O}\phantom{................}\ce{O}\phantom{.}\\
\phantom{}||\phantom{.................}||\phantom{}\\
\ce{CH - C - CH2 - CH2 - C - OH}
\end{array}\] is ______.

Rotation around carbon-carbon single bond of ethane is not completely free. Justify the statement.

Draw Newman and Sawhorse projections for the eclipsed and staggered conformations of ethane. Which of these conformations is more stable and why?

If the density of a solution is 3.12 g mL^–1, the mass of 1.5 mL solution in significant figures is ______.

Write the general outer electronic configuration of d- block elements.

Which of the following are isoelectronic species i.e., those having the same number of electrons?

Na⁺, K⁺, Mg²⁺, Ca²⁺, S^2–, Ar

What are the atomic numbers of elements whose outermost electrons is represented by 3s¹.

What are the atomic numbers of elements whose outermost electrons is represented by 2p³.

What are the atomic numbers of elements whose outermost electrons is represented by 3p⁵?

In Milikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is - 1.282 × 10^-18C, calculate the number of electrons present on it.

Define the bond length.

Calculate the number of kJ of heat necessary to raise the temperature of 60.0 g of aluminium from 35°C to 55°C. Molar heat capacity of Al is 24 J mol^-1 K^-1.

For the following equilibrium, K_c = 6.3 × 10¹⁴ at 1000 K

\[\ce{NO (g) + O3 (g) ⇌ NO2 (g) + O2 (g)}\]

Both the forward and reverse reactions in the equilibrium are elementary bimolecular reactions. What is K_c, for the reverse reaction?

Comment on the following observation:

E^⊝ for \[\ce{M^{2+}_{(aq)} + 2e– -> M(s)}\] (where M = Ca, Sr or Ba) is nearly constant.

Describe the effect of addition of H₂  on the equilibrium of the reaction: 

\[\ce{2H2(g) + CO (g) ⇌ CH3OH (g)}\]

Describe the effect of Addition of CH₃OH  on the equilibrium of the reaction: 

\[\ce{2H2(g) + CO (g) ⇌ CH3OH (g)}\]

Describe the effect of Removal of CO on the equilibrium of the reaction: 

\[\ce{2H2(g) + CO (g) ⇌ CH3OH (g)}\]

Describe the effect of Removal of CH₃OH on the equilibrium of the reaction:

\[\ce{2H2(g) + CO (g) ⇌ CH3OH (g)}\]