List of practice Questions

$HNO_{2}$ can act both as a reducing agent and an oxidising agent. In $HNO_{2},$ oxidation state of nitrogen is $+3 $ which can change from $-3$ to $+5$.

Hofmann degradation of benzamide gives aniline. Hofmann bromamide degradation reaction can be used for descending amine series.

Human beings have two sets of teeth during their life Human beings have thecodont dentition

Glycolysis is also called $EMP$ pathway. It is the only process of respiration in aerobic organisms.

$GM$ salmon was the first transgenic animal for performing vaccine safety tests. For the production of $GM$ salmon, genetically modified ova were fused with normal sperms of the same species.

Haloalkanes react with $KCN$ to form alkyl cyanides as main product while with $AgCN$ form isocyanide as the main product. $KCN$ and $AgCN$, both are ionic compounds.

Genetic variation shown by the plant Rauwolfia vomitoria growing in different Himalayan ranges is very important economically. The amount and variety of alkaloids present in this plant, change both between the Rauwolfia species and between the different strains of R. vomitoria.

Geometrical isomerism is also called cis-trans isomerism. Tetrahedral complexes show geometrical isomerism.

Glass panes fixed to windows or doors of old buildings are slightly thicker at the bottom than at the top. Glass is a pseudo solid or supercooled liquid.

Glucose gets oxidised to gluconic acid on reaction with mild oxidising agent like bromine water. Glucose contains a keto group.

For the element $O$ or $F$, the electron gain enthalpy is less negative than that of the succeeding element. Electron gain enthalpy becomes less negative as we go down a group.

Fruit is the mature or ripened ovary developed after fertilisation. Fruit formed without fertilisation of the ovary is called parthenocarpic fruit.

Fullerenes are the only pure form of carbon. It contains twenty, five-membered rings and twelve, six-membered rings.

Fibrous joints play a significant role in locomotion. Fibrous joints have fluid-filled cavity between the articulating surfaces of the two bones.

Evencs refers to a scientific method of treating $e$-wastes in an environment friendly manner. Recycling of $e$-wastes in developed countries often involves manual participation and exposes the workers to toxic substances present in e-wastes.

Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Sporopollenin is absent in the region of germ pores.

$[Fe(H_{2}O ) _{6}]^{3+}$ is strongly paramagnetic whereas $[Fe(CN)_{6}]^{3-}$ is weakly paramagnetic. $H_{2}O$ is a weak field ligand and $CN^{-}$ is a strong field ligand.

Fermentation is the incomplete oxidation of glucose into lactic acid or ethanol. It takes place under anaerobic conditions in prokaryotes only.

$ELISA$ test is based on antigen-antibody interactions where a pathogen can be detected by the presence of antibodies (proteins, glycoproteins, etc.) on it. The pathogen antibody to be identified is immobilised on the surface of specially constructed $ELISA$ plates and is then tested.

Energy can neither be created nor destroyed. The principle of conservation of energy cannot be proved.

Electrical synapses are rare in our system Impulse transmission across an electrical synapse is slower than that across a chemical synapse

Dust particles when come in contact with respiratory tract lead to sneezing, running nose, redness of eyes etc. Allergic disorders are caused due to release of histamine.

E.coli having $pBR322$ with $DNA$ insert at BamHI site cannot grow in medium containing tetracycline. Recognition site for BamHI is present in $tet^R$ region of $pBR322$.

Earthworms are known as 'friends of farmers' Earthworms make burrows in the soil and make the soil porous, which helps in respiration and penetration of developing plant roots

Diaphragms, cervical caps and vaults are barriers made of rubber. Diaphragms, cervical caps and vaults are inserted into the male reproductive tract during coitus.