List of practice Questions

Density of a gas is found to be $5.46 g/dm^3$ at $27 \,^{\circ}C$ and $2$ bar pressure. What will be its density at $STP$?

Deposition of calcareous shell around zygote occurs in

$\Delta U^?$ of combustion of $CH_{4(g)}$ at certain temperature is $- 393 \,kJ\, mol^{-1}$. The value of $\Delta H^?$ is

Dehydration of hydrates of halides of calcium, barium and strontium i.e., $CaCl_2 \cdot 6H_2O$, $BaCl_2 \cdot 2H_2O$, $SrCl_2 \cdot 6H_2O$, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides ?

Dehydration of the following in increasing order is

Delivery of developed fetus is scientifically called

$\Delta =\begin{vmatrix} sin^2x & cos^2x & 1 \\[0.3em] cos^2x &sin^2x & 1 \\[0.3em] -10 & 12& 2 \end{vmatrix}$

$\Delta H$ for the reaction, $OF_2 + H_2O \to O_2 + 2HF$ $(B.E.$ of $O ?

Dehydration of alcohols to ethers is catalysed by :

Decomposers like fungi and bacteria are (i) autotrophs (ii) heterotrophs (iii) saprotrophs (iv) chemo-autotrophs. Choose the correct answer.

Decompound leaves are

Decreasing order of boiling points among ethanol, butan-1-ol, butan-2-ol and methanol is

Dachigam Wildlife Sanctuary in Kashmir is associated with

Dark band of a sarcomere is anisotropic or doubly refractive because of the presence of

Dark reaction in photosynthesis is called so because

$\frac{d}{dx}\left\{cosec^{-1}\left(\frac{1+x^{2}}{2x}\right)\right\}$ is equal to

$\frac{d}{dx}\left(tan^{-1}\left(\frac{\sqrt{x}-\sqrt{a}}{1+\sqrt{xa}}\right)\right)$, $x$, $a > 0$, is

$ {D-(+)-Glucose ->[5(CH_3CO)_2O]D-(+)-Glucose \,pentaacetate}$ Which statement(s) is/are true about glucose pentaacetate?

If $ lim_{ x \to 0 } [ 1 + x \, log \, (1 + b^2) ]^{\frac{1}{x}} = 2 b sin^2 \, \theta, b > 0 \, and \, \theta \in ( - \pi , \pi), $ then the value of $ \theta $ is

Cyclone collector is used for minimising

Cyclotron is adjusted to give proton beam, magnetic induction is 0.15 $wbm^{-2}$ and the extreme radius is 1.5 m. The energy of emergent proton in MeV will be

$\frac{d^{2}x}{dy^{2}} $ equals :

Cyclohexane when treated with $Br_2\, in\, CCl_4$ gives

Cyclohexanone is subjected to reduction by $NaBH_4$. The product formed is