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The major organic product formed in the following reaction is:

The algebraic sum of the oxidation number of all the atoms in a compound must be

The order of decreasing reactivity towards an electrophilic reagent for the following

I. Benzene II. Toulene III. Chloro benzoic acid IV.Phenol

What should be the order of arrangement of de-Broglie wavelengths of an electron $\left({\lambda }_e\right),$ an $\alpha$-particle $\left({\lambda }_{\alpha }\right)$ and a proton $\left({\lambda }_p\right)$ given that all have the same kinetic energy ?

The percentage of lime in Portland Cement is approximately

Which of the following chlorides cannot get hydrolysed ?

If the mole fraction of iodine in benzene is $0.25$, then what will be the molality of the solution?

The ionisation energy of hydrogen atom in its ground state is $13.6\text{eV}$. The energy released (in $\text{eV}$) for the third line of Balmer series is:

1. 3138.56

Complete the missing products (X), (Y) and (Z) by making an appropriate choice.



$C{H}_{3}COOH\stackrel{PB{r}_3/B{r}_2}{\to }X\stackrel{KCN}{\to }Y\stackrel{H_3{O}^{+}}{\to }Z$

A source of sound and a detector are placed at the same place on ground. At t = 0, the source S is projected towards reflector with velocity $V_0$ in vertically upward direction and reflector starts moving down with constant velocity $V_0$. At t = 0, the vertical separation the reflector and source is $H(>\frac{v_0^2}{2g})$ . The speed of sound in air is v(>>$v_0$). Take f₀ as the frequency of sound waves emitted by source. Based on above information answer the following questions.

The order of increasing acidic strength for boron hydrides is:

Calculate the mass of lime obtained by heating 200g of 95% pure limestone.

A thermally insulating cylinder has a thermally insulating and frictionless movable partition in the middle, as shown in the figure below. On each side of the partition, there is one mole of an ideal gas, with specific heat at constant volume, $C_v=2R$ . Here, $R$ is the gas constant. Initially, each side has a volume $V_0$ and temperature $T_0$. The left side has an electric heater, which is turned on at very low power to transfer heat $Q$ to the gas on the left side. As a result the partition moves slowly towards the right reducing the right side volume to $V_0/2$. Consequently, the gas temperatures on the left and the right sides become $T_L$ and $T_R$, respectively. Ignore the changes in the temperatures of the cylinder, heater and the partition.





The value of $\frac{Q}{R{T}_0}$ is

Which metal exhibits more than one oxidation state in its compounds?

How
are the following conversions carried out?

(i)
Propene → Propan-2-ol

(ii)
Benzyl chloride → Benzyl alcohol

(iii)
Ethyl magnesium chloride → Propan-1-ol.

(iv)
Methyl
magnesium bromide → 2-Methylpropan-2-ol.

Use the periodic table
to answer the following questions.

(a) Identify an
element with five electrons in the outer subshell.

(b) Identify an
element that would tend to lose two electrons.

(c) Identify an
element that would tend to gain two electrons.

(d) Identify the group having metal, non-metal, liquid as well as
gas at the room temperature.

Among the following the strongest base is

Which of the following will have $S-S$ bond:

The firm of Ravi and Mohan was dissolved on 1st March, 2013. According to the agreement Ravi had agreed to undertake the dissolution work for an agreed remuneration of Rs. 2,000 and bear all realisation expenses. Dissolution expenses were Rs. 1,500 and the same were paid by the firm. Pass necessary journal entries for the payment of dissolution expenses.

State what information is provided by the formula of calcium hydroxide Ca( OH) 2.

Give the formula for: a) hydrogen chloride

b) ammonia c) carbon monoxide d) nitric acid e) nitrous oxide f) nitrogen dioxide g) nitrogen h) sulphur

Find the no. Of waves in 5 orbit of an atom.

When $100\text{mL}$ of $0.4MC{H}_{3}COOH$ is mixed with $100\text{mL}$ of $0.2MNaOH$, the approximate value of $\left[H_3{O}^{+}\right]$ in the solution mixture is? $\left[K_a\right(C{H}_{3}COOH)=1.8\times {10}^{-5}]$