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Paramagnetic species among the following is:
The most characteristic oxidation state for lead and tin is, respectively:
The percentages of C, H, and N in an organic compound are 40%, 13.3%, and 46.7% respectively. The empirical formula of the compound is:
$20.0\text{ g}$ of a magnesium carbonate sample decomposes on heating to give carbon dioxide and $8.0\text{ g}$ magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight of Mg = 24)
Which of the following contraceptive methods do involve a role of hormone?
Which of the following is the correct statement?
Which among the following has the maximum number of molecules?
The correct order of electronegativity of hybrid orbitals of carbon is:
Among the following, the pair in which the two species are not isostructural is:
Variations caused by mutation, as proposed by Hugo de Vries are
Which of the following is not a monomer for a high molecular mass silicone polymer?
Choose the compound which has a maximum bond angle at nitrogen among the following:
Which one of the following pairs of species have the same bond order?
Match the organism with its use in biotechnology. (a) Bacillus thuringiensis (i) Cloning vector (b) Thermus aquaticus (ii) Construction of first rDNA molecule (c) Agrobacterium tumefaciens (iii) DNA polymerase (d) Salmonella typhimurium (iv) Cry proteins
In which of the following molecules, all atoms are coplanar?
Which of the following is not a correct statement?
$\text{XeF}_2$ is isostructural with:
A mixture of $2.3 \text{ g}$ formic acid and $4.5 \text{ g}$ oxalic acid is treated with conc. $\text{H}_2\text{SO}_4$. The evolved gaseous mixture is passed through $\text{KOH}$ pellets. Weight (in g) of the remaining product at STP will be:
The correct order of increasing bond order among the given is:
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :