Science (English Medium) Class 11 - CBSE Question Bank Solutions

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.

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:

\[\ce{2H2(g) + CO (g) ⇌ CH3OH (g)}\]

Among NH₃, H₂O and HF, which would you expect to have highest magnitude of hydrogen bonding and why?

Arrange the following:

CaH₂, BeH₂ and TiH₂ in order of increasing electrical conductance.

Describe the usefulness of water in biosphere and biological systems.

What properties of water make it useful as a solvent? What types of compound can it (i) dissolve, and (ii) hydrolyse?

Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high-temperature steam. The first stage of two-stage reaction involves the formation of CO and H₂. In the second stage, CO formed in the first stage is reacted with more steam in water gas shift reaction,

\[\ce{CO (g) + H2O (g) ⇌ CO2 (g) + H2 (g)}\]

If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam such that `"p"_"CO" = "p"_("H"_2"O")` = 4.0 bar, what will be the partial pressure of H₂ at equilibrium? K_p = 10.1 at 400°C.