List of practice Questions

Blood in cockroach is colourless haemolymph with no respiratory pigment. Respiration in cockroach occurs through diffusion in haemolymph.
: As a lead storage battery gets discharged, density of electrolyte, present in it, decreases. : Lead and lead dioxide both react with sulphuric acid to form lead sulphate.
Algal blooms are formed in nutrientless water. Algal blooms in water turn it unfit for human consumption, but cause enormous growth of fish.
A mangrove tree growing in marshy place has pneumatophores. Pneumatophores help in better anchorage to marshy soil.
An organic compound $'X'$ on treatment with pyridinium chlorochromate in dichloromethane gives compound $'Y'$ Compound $'Y'$ reacts with $I_{2}$ and alkali to form triiodomethane. The compound $'X'$ is
$CH _{3} COOH \xrightarrow{ LiAlH _{4}}A + CH _{3} COOH \xrightarrow{ H _{3} O ^{+}} B + H _{2} O$ In the above reactions ' $A$ ' and ' $B$ ' respectively are
The following are some statements related to $VA $ group hydrides, I. Reducing property increases from $NH_{3}$ to $BiH_{3}$ II. Tendency to donate lone pair decreases from $NH_{3}$ to $BiH_{3}$ III. Thermal stability of hydrides decreases from $NH_{3}$ to $BiH_{3}$ IV. Bond angle of hydrides decreases from $NH_{3}$ to $BiH_{3}$ The correct statements are
Which of the following is not tetrahedral?
Which one of the following noble gases is used in miners cap lamps?
$138\, g$ of ethyl alcohol is mixed with $72\, g$ of water. The ratio of mole fraction of alcohol to water is
Asexual reproductive structure of Hydra is
Hofmann's bromamide reaction is to convert
The correct order in which the first ionisation potential increases is
When conc. $H _{2} SO _{4}$ is heated with $P _{2} O _{5}$, the acid is converted into
Nitration of nitrobenzene at $125^{\circ} C$ with mixed acids gives
Ammonium ion is
Placoid scales are characteristic feature of the class
The medulla oblongata contains centres which control
Which cell inclusions are found in mycoplasmas, spirochaetes and rickeltsias ?
Which one of the following is the high quality pearl producing species
Analogous structures are
The generic name of Mango is
Analogous structures are a result of :
In which of the following groups are seeds present?
Ergotamine tartarate extracted from Claviceps, is used for cure of