Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions

Which of the following statements are not true for hydrogen?

(i) It exists as diatomic molecule.

(ii) It has one electron in the outermost shell.

(iii) It can lose an electron to form a cation which can freely exist.

(iv) It forms a large number of ionic compounds by losing an electron.

Which of the following statements is correct?

(i) Hydrides of group 13 act as Lewis acids.

(ii) Hydrides of group 14 are electron deficient hydrides.

(iii) Hydrides of group 14 act as Lewis acids.

(iv) Hydrides of group 15 act as Lewis bases.

Which of the following statements is correct?

(i) Metallic hydrides are deficient of hydrogen.

(ii) Metallic hydrides conduct heat and electricity.

(iii) Ionic hydrides do not conduct electricity in solid-state.

(iv) Ionic hydrides are very good conductors of electricity in solid state.

What are metallic/interstitial hydrides? How do they differ from molecular hydrides?

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.