Half-life of first order reaction \(X \rightarrow Y + Z is 3 \text{ minutes.}\) What is the time required to reduce the concentration of X by 90% of its initial concentration?
Standard enthalpy of formation of water is \(-286\,\text{kJ mol}^{-1}\). When \( 1800\,\text{mg}\) of water is formed from its constituent elements in their standard states, the amount of energy liberated is
In the reaction 2\(\mathrm{N_2O_5(g)} \rightarrow 4\mathrm{NO_2(g)} + \mathrm{O_2(g)}, \)the rate of formation of\( \mathrm{NO_2(g)} and \mathrm{O_2(g)} \) are in the ratio
If a dilute solution of\( \mathrm{AgNO_3}\) is added to a dilute solution of excess \(\mathrm{NaI}\), then the species adsorbed on AgI colloidal particles is
The distance between electrodes of a conductivity cell is \(0.98\,\text{cm}\) and the area of cross-section is \(1.96\,\text{cm}^2\). What is the cell constant?
What is the bond order in \(\mathrm{N_2}\) molecule?
From the given reaction, \(\mathrm{N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)},\ \Delta H = -92.6\,\text{kJ}, the enthalpy of formation of \mathrm{NH_3} is\)
Which among the following alkali metal elements is used as coolant in fast breeder nuclear reactors?
How many primary amines are possible for the molecular formula \(\mathrm{C_4H_{11}N}\,?\)
Which of the following reactions involves \(\alpha-halogenation\) of carboxylic acid?
The number of \(\sigma\) bonds in carbolic acid are
A sample of calcium carbonate has the following percentage composition: \(\mathrm{Ca}=40%,\)\(\mathrm{C}=12%,\) \(\mathrm{O}=48%. A\).According to the law of definite proportion, the weight of calcium in \(4\text{g}\) of a sample of calcium carbonate from another source will be \(\text{ (at. no. Ca = 40, C = 12, O = 16)}\).
Match Column - I with Column - II considering mode of asexual reproduction. Column - I Column - II a) Binary fission i) Spirogyra b) Conidia ii) Yeast c) Budding iii) Amoeba d) Fragmentation iv) Penicillium
Select the correct match from Column-I with Column-II. Column-I Column-II a) Fibrous pericardium i) Mesothelium b) Lymphocyte ii) Scavenger c) Bundle of His iii) Circular with kidney shaped nucleus d) Erythrocyte iv) Connection with AV node v) Interventricular septum
Match Column-I with Column-II and select the correct option. Column-I Column-II a) Sunflower i) Protogyny b) Castor ii) Self incompatibility c) Michellia iii) Protandry d) Orchid iv) Unisexuality