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Which of the following is not correct?

Why do haloalkanes form alkyl cyanides when reacting with KCN?

Which among the following is the most reactive?

Pregnane is a molecular substance which contains 21 carbon atoms per molecule. If the molar mass of the substance is $360g/mol$, calculate the mass percentage of carbon in pregnane.

In which set of molecules all species are paramagnetic

Why the freezing point of Urea decreases when we mixed it in water?

Which of the following reactions is not possible

If the velocity of hydrogen molecule is $5\times {10}^{4}cmse{c}^{-1}$,then its de-Broglie wavelength is

The correct statements among the following are:

I. Due to greater polarizing power of $L{i}^{+}$, $L{i}_{2}C{O}_3$ is most stable
II. $LiHC{O}_3$ does not exist as solid
III. $NaN{O}_3$ on strong heating gives $NaN{O}_2$ whereas $LiN{O}_3$ will give $L{i}_{2}O$
IV. Sodium & Potassium ions are involved in the transport of sugars and amino acids into the cells
V. $LiF$ is less soluble due to smaller hydration energy of $L{i}^{+}$ ion

1 gm of magnesium is burnt with 0.56gm of O2 in a closed vessel.Which reactant is left in excess and how much

Which of the following pairs of compounds is isoelectric and isostructural?

According to Maxwell, Boltzmann distribution of energy, ......... .
(a) the fraction of molecules with most probable kinetic energy decreases at higher temperatures
(b) the fraction of molecules with most probable kinetic energy increases at higher temperatures
(c) most probable kinetic energy increases at higher temperatures
(d) most probable kinetic energy decreases at higher temperatures

Question 26

Which of the following species have the same shape?

(a) $C{O}_2$

(b) $CC{l}_4$

(c) $O_3$

(d) $N{O}_2^{-}$

Define the term chemotherapy ?

Which of the following does not give a precipitate of $AgCl$ with $AgN{O}_3$ solution?

A tertiary alcohol ‘H’ upon acid catalyzed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M.

Compound ‘H’ is formed by the reaction of

Which one has the highest boiling point?

In the modern periodic table, the period indicates the value of:
(a) Atomic number
(b) Atomic mass
(c) Principal quantum number
(d) Azimuthal quantum number.

Reaction of alkyl halides with ammonia to form a mixture of primary,secondary and tertiary amine is:

Paragraph 2
The reactions of $C{l}_2$ gas with cold-dilute and hot-concentrated NaOH in water give soduum salts fo two different oxoacids of chlorine, P and Q, respectively. The $C{l}_2$ gas reacts with $S{O}_2$ gas, in presence of charcoal, to give a product R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus.

4. R, S and T, respectively, are
(IIT-JEE, 2013)

One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 amu. The alkene is :

Match the following

$\begin{array}{cccc}& Column-I& & Column-II\\ \left(a\right)& Incus& \left(i\right)& Vertebralcolumn\\ \left(b\right)& Femur& \left(ii\right)& Longest-bone\\ \left(c\right)& Floatingribsinhumans& \left(iii\right)& Anvilshaped\\ \left(d\right)& Cartilagenousbone& \left(iv\right)& 4\\ \left(e\right)& Pelvicgirdle& \left(v\right)& 2\end{array}$

In a compound, atoms of element Y form ccp lattice and those of element X occupy $\frac{2}{3}$ rd tetrahedral voids. The formula of the compound will be:

If in a $\Delta$ ABC, perimeter is 12 units, b = 3 units, c = 5 units then find $sin\left(\frac{A}{2}\right)$.

One litre solution of $MgC{l}_2$ is electrolyzed completely by passing a current of 1A for 16 min 5 sec. The original concentration of $MgC{l}_2$ solution was (Atomic mass of Mg = 24)

Identify the correct order of acidic strength of $C{O}_2,CaO,H_{2}O$.

Experimentally it was found that a metal oxide has formula $M_{0.98}O$. Metal M, is present as $M^{2+}$ and $M^{3+}$ in its oxide.
Fraction of the metal which exists as $M^{3+}$ would be:

Which of the following reaction(s) is/ are correct ?

Which of the following would react with benzenediazonium chloride under basic conditions to form azo dyes?

Which of the following is most acidic?
(a) Benzyl alcohol
(b) Cyclohexanol
(c) Phenol
(d) m - chlorophenol

Write the significance/applications of dipole moment.

What will be the n-factor $\left(n_f\right)$ for $F{e}_2{O}_3$ in the following chemical change :
$F{e}_2{O}_3\to FeS{O}_4$

Benzene diazonium chloride on reaction with phenol in weakly basic medium gives

Basic strength of

(i) $H_3\overline{C}{H}_2$ (ii) $H_{2}C=\overline{C}H$ (iii) CH ≡ $\overline{C}$ is in the order

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ions are required to make teeth enamel harder by converting $\left[3C{a}_3\right(P{O}_4{)}_2.Ca\left(OH{)}_2\right]$ to

Dehydration of hydrates of halides of calcium, barium and strontium i.e., $CaC{l}_2.6H_{2}O,BaC{l}_2.2H_{2}O,SrC{l}_2.2H_{2}O,$
can be achieved by heating these become wet on keeping in the air. Which of the following statements. Is correct about these halides?
(a) Act as dehydrating agent
(b) Can absorb mositure from air
(c) Tendency to form hydrate decrease from calcium to barium
(d) All of the above

The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of $\text{10}m/s$ is approxiamately: $\text{(plancks's constant,}h=6.63\times {10}^{-34}Js)$

Which of the following reaction sequence(s) will give fluorobenzene as the product?

Vant' Hoff equation shows the effect of temperature on equilibrium constants $K_c$ and $K_p.$ The $K_p$ varies with temperature according to the relation:

What is gold no. ? Explain with example