List of practice Questions

$Cr^{2+}$ is reducing and $Mn^{3+}$ is oxidising. $Cr^{2+}$ and $Mn^{3+}$ have $d^4$ configuration.

Copper dissolves in dilute nitric acid but not in dilute $HCl$. Copper has positive $E^?$.

Cork or phellem is impervious to water. Cork has suberin deposition in the cell wall.

Compressed natural gas $(CNG)$ is natural gas under pressure and mainly composed of methane. One of the advantages of using $CNG$ as a fuel in automobiles is that it requires very less space for storage as compared to that of petrol or diesel.

Connective tissues are the most abundant and widely distributed in the body of complex animals Connective tissues link and support other tissues or organs of the body

Consciousness is a defining property of living organisms. Human being is the only organism that has self consciousness.

Cooking food is difficult on hills. The boiling point decreases with increase in pressure.

CO and CN are referred as $\pi$ acid ligands. In CO and CN vacant $\pi$ type orbitals are present.

Cockroach shows sexual dimorphism The female cockroach bears a pair of short thread like anal styles

Cohesion, adhesion and surface tension give high tensile strength to water. Capillarity is aided by small diameter of the tracheary elements.

Common name of $1,1$-dichloroethane is ethylidene chloride. Ethylidene chloride is a gem-dihalide.

Classical smog is oxidising smog whereas photochemical smog is reducing smog. Classical smog occurs in warm, dry and sunny climate whereas photochemical smog occurs in cool humid climate.

Classification is necessary to study all living organisms. In classification, individuals are grouped into categories.

Closed circulatory system is less efficient than open circulatory system. The blood flow is slow in closed circulatory system than in open circulatory system.

$CO_{2}$ is a gas at room temperature while $SiO_{2}$ is a crystalline solid. $SiO_{2}$ is a network of silicon and oxygen atoms joined by multiple bonds.

Catenation tendency is weaker in nitrogen. Nitrogen exists as diatomic gas.

$CH_{2} = C H ??H_{2}??$ is an example of allyl halides. These are the compounds in which the halogen atom is bonded to an $sp^{2}$ hybridised carbon atom.

Chances of survival of young ones is greater in viviparous organisms. All mammals are viviparous.

Carbon atom is tetravalent though it has two unpaired electrons. Carbon has unique ability to form $p\pi-p\pi$ multiple bonds with itself like $C=C, C\equiv C$.

Carbon monoxide is a poisonous gas. Carbon monoxide combines with haemoglobin to form carboxy-haemoglobin which prevents absorption of oxygen by it.

Both apical meristem and intercalary meristem are primary meristems. Both of these meristems appear early in life of a plant and help in the formation of the primary plant body.

: Bulk modulus if elasticity (K) represents incompressibility of the material. : Bulk modulus of elasticity is proportional to change in pressure.

Buna-$S$ is a copolymer. Buna-$S$ is formed by condensation reaction between two different monomers.

Caecum is a small blind sac which hosts some symbiotic microorganisms Escherichia coli in return produces vitamin $B_{12}$, vitamin $K$, thiamine and riboflavin

Bharat stage $IV$ emission norms have been in place since April $2010$, for $4$ wheelers in $13$ mega cities of India. Green muffler scheme refers to the plantation of trees and shrubs along road sides and is effective to control noise pollution only.