The reaction
\(\text{Cr}_2\text{O}_3 + 2\text{Al} \rightarrow \text{Al}_2\text{O}_3 + 2\text{Cr}\)
\(\Delta G° = -421 \text{ kJ}\)
does not take place at room temperature because:

The reagent(s) used in hydroboration oxidation of propene are
(A) B₂H₆
(B) H₂O
(C) H₂O₂
(D) OH^-
Choose the correct answer from the options given below :

Based on the standard electrode potential given in the table

Half-cell reaction	(E./V) at 25.C)
\(F _2(g)+2 e ^{-} \rightarrow 2 F^{-}\)	\(2.87\)
\(NO _3^{-}+4 H ^{+}+3 e ^{-} \rightarrow NO ( g )+2 H _2 O\)	\(0.97\)
\(Cu ^{2+}+2 e ^{-} \rightarrow Cu ( s )\)	\(0.34\)
\(2 H ^{+}+2 e ^{-} \rightarrow H _2(g)\)	0.00
\(Zn ^{2+}+2 e ^{-} \rightarrow Zn ( s )\)	\(-0.76\)
\(L i ^{+}+ e ^{-} \rightarrow L i ( s )\)	\(-3.05\)

Choose the wrong / incorrect statement from the options given below:

The correct relation for determining the molar mass of solute ( \(M_2\) )
using osmotic pressure measurement, is

Which of the following compounds will undergo Cannizzaro reaction

An element ' \(Y\) ' has a body centred cubic (bec) structure with a cell edge of 144 pm . The density of the element is \(3.6 g / cm ^3\). How many atoms are present in 720 g of the element?

Molecules are the constituent particles of molecular solids. Identify the molecular solid amongst the following:

If the matrix \(\left[\begin{array}{ccc}3 & 2 a & -5 \\ -4 & 0 & b \\ -5 & 3 & 7\end{array}\right]\) is symmetric, then the value of \((a+b)\) is :

Out of the following which will be see-saw shaped?
A. \(\text{XeO}_2\text{F}_2\)
B. \(\text{SF}_4\)
C. \(\text{BrF}_3\)
D. \(\text{XeO}_4\)
Choose the correct answer from the options given below:

Read the following passage carefully and answer the given questions
The earthworm is referred to as the farmer's friend. This is because they help in the breakdown of complex organic matter as well as in loosening of soil. Similarly, decomposers break down complex organic matter into inorganic substances like carbon dioxide, water and nutrients and the process is called decomposition. Dead plant remains such as leaves, bark, flowers and dead remains of animals, including fecal matter, constitute detritus, which is the raw material for decomposition. Some of the steps in the process of decomposition are fragmentation, catabolism, leaching, humification etc.
The process of breaking down of detritus into smaller particles is called:

Calculate the Ratio of Range of Transmitting antenna of height 64 m to the receiving antenna of height 16 m :

A carrier wave \(C(t) = A_c \sin \omega_c t\) is amplitude modulated by modulating signal \(m(t) = A_m \sin \omega_m t\). The maximum and minimum amplitudes of the modulated wave are found to be 20 V and 5 V respectively. The modulation index is:

Given below are the names of some recent animal extinctions along with the country to which it belongs.
Match the animal with its country.

List - I (Name of extinct Animal)	List - II (Name of the country)
(A) Steller's Sea Cow	(i) Mauritius
(B) Dodo	(ii) Africa
(C) Thylacine	(iii) Russia
(D) Quagga	(iv) Australia

Choose the correct answer from the options given below :