Recent questions in JEEMAIN and NEET

An alkene "A" on reaction with $O_3$ and $Zn-H_2O$ gives propanone and ethanal in equimolar ratio.Addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is :-

asked Jul 8, 2019 by pady_1

1 answer

Which is the correct thermal stability order for $H_2E$ (E=O, S, Se, Te and Po) ?

asked Jul 8, 2019 by pady_1

1 answer

Match the Xenon compounds in Coloumn - I with its structure in Column - II and assigning the correct code:

asked Jul 8, 2019 by pady_1

1 answer

The biodegradable polymer is :-

asked Jul 8, 2019 by pady_1

1 answer

4d, 5d, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :-

asked Jul 8, 2019 by pady_1

1 answer

Identify the incorrect statement related to $PCl_5$ from the following :-

asked Jul 8, 2019 by pady_1

1 answer

If the rate constant for a first order reaction is k,the time (t) required for the completion of 90% of the reaction is given by :-

asked Jul 8, 2019 by pady_1

1 answer

For the second period elements the correct increasing order of first ionisation enthalpy is :-

asked Jul 8, 2019 by pady_1

1 answer

The manganate and permanganate ions are tetrahedral, due to

asked Jul 8, 2019 by pady_1

1 answer

Which of the following is an amphoteric hydroxide?

asked Jul 8, 2019 by pady_1

1 answer

Which of the following species is not stable ?

asked Jul 8, 2019 by pady_1

1 answer

Which will make basic buffer ?

asked Jul 8, 2019 by pady_1

1 answer

Conjugate base for Bronsted acids $H_2O$ and HF are:-

asked Jul 8, 2019 by pady_1

1 answer

Which mixture of the solutions will lead to the formation of negatively charged colloidal $[AgI] I^{-}$ sol. ?

asked Jul 8, 2019 by pady_1

1 answer

The correct order of the basic strength of methyl substituted amines in aqueous solution is :-

asked Jul 8, 2019 by pady_1

1 answer

Among the following, the narrow spectrum antibiotic is

asked Jul 8, 2019 by pady_1

1 answer

Which of the following reactions are disproportionation reaction ? (a) $2Cu^{+} \to Cu^{2+}+Cu^0$ (b) $3MnO_4^{2-}+4H^{+} \to 2MnO_4^{-}+MnO_2$ (c) $2KMnO_4 \underrightarrow{\qquad \Delta \qquad } K_2MnO_4 +MnO_2 +O_2$ (d) $2MnO_4^{-}+3Mn^{2+}+2H_2O \longrightarrow 5MnO_2+4H^{\oplus}$ Select the correct option from the following

asked Jul 8, 2019 by pady_1

1 answer

Which of the following diatomic molecular species has only $\pi$ bonds according to Molecular Orbital theory?

asked Jul 8, 2019 by pady_1

1 answer

The number of sigma $(\sigma)$ and pi $(\pi)$ bonds in pent-2-en-4-yne is :-

asked Jul 8, 2019 by pady_1

1 answer

Among the following, the one that is not a green house gas is :-

asked Jul 8, 2019 by pady_1

1 answer

For a cell involving one electron $E^\ominus$ cell = 0.59V at 298 K, the equilibrium constant for the cell reaction is :- $\bigg[Given \;that \frac{2.303RT}{F}=0.059V \;at \;T=298k\bigg]$

asked Jul 8, 2019 by pady_1

1 answer

For an ideal solution, the correct option is :-

asked Jul 8, 2019 by pady_1

1 answer

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is :-

asked Jul 8, 2019 by pady_1

2 answers

pH of a saturated solution of $Ca(OH)_2$ is 9. The solubility product $(K_{sp})$ of $Ca(OH)_2$ is :-

asked Jul 8, 2019 by pady_1

1 answer

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :-

asked Jul 8, 2019 by pady_1

1 answer

Under isothermal condition, a gas at 300 K expands from 0.1L to 0.25L against a constant external pressure of 2 bar. The work done by the gas is :- [Given that 1L bar = 100 J]

asked Jul 8, 2019 by pady_1

1 answer

10.6 g of a substance of molecular weight 106 was dissolved in 100 mL. 10 mL of this solution was pipetted out into a 1000 mL flask and made up to the mark with distilled water. The molarity of the resulting solution is :

asked Dec 20, 2018 by pady_1

0 answers

If the vectors $\overrightarrow{a} = ( 1, x, -2)$ and $\overrightarrow{b} = (x, 3, -4)$ are mutually perpendicular, then is :

asked Dec 19, 2018 by pady_1

1 answer

If $|\overrightarrow{a}| = 5, |\overrightarrow{b} |= 6, |\overrightarrow{a}. \overrightarrow{b} | = 24$ then $|\overrightarrow{a} \times \overrightarrow{b} |$ is equal to :

asked Dec 19, 2018 by pady_1

1 answer

If $\overrightarrow{\alpha}$ and $\overrightarrow{\beta}$ are non zero and different vector such that $|\overrightarrow{\alpha} + \overrightarrow{\beta}| = |\overrightarrow{\beta} - \overrightarrow{\alpha}|$ , then the angle between $\overrightarrow{\alpha}$ and $\overrightarrow{\beta}$ is :

asked Dec 19, 2018 by pady_1

1 answer

If $\overrightarrow{a}, \overrightarrow{b}, \overrightarrow{c}$ are unit vectors such that $\overrightarrow{a} + \overrightarrow{b} + \overrightarrow{c} = 0$ . Then $\overrightarrow{a}. \overrightarrow{b} + \overrightarrow{b}. \overrightarrow{c} + \overrightarrow{c} . \overrightarrow{a}$ is equal to :

asked Dec 19, 2018 by pady_1

1 answer

The angle between the planes $\overrightarrow{r} ( 2 \hat{i} - \hat{j} + 2 \hat{k}) = 3$ and $\overrightarrow{r}(3 \hat{i} - 6 \hat{j} + 2 \hat{k} )= 4$ is :

asked Dec 19, 2018 by pady_1

0 answers

If $\overrightarrow{A}, \overrightarrow{B}, \overrightarrow{C}$ are three vectors such that $|\overrightarrow{A} | = 4, \; |\overrightarrow{B}| = 5,\; |\overrightarrow{C}|=6$ , then $[\overrightarrow{A} - \overrightarrow{B} \; \; \overrightarrow{B} - \overrightarrow{C} \; \; \overrightarrow{C} - \overrightarrow{A} ]$ is equal to :

asked Dec 19, 2018 by pady_1

1 answer

If $\overrightarrow{A} = \hat{i} + \lambda \hat{j} + \hat{k}, \; \overrightarrow{B} = \hat{i} + \hat{j} + \hat{k}$ , then for $|\overrightarrow{A} + \overrightarrow{B}| = |\overrightarrow{A} | + |\overrightarrow{B}|$ to be true, the value of $\lambda$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

If $2\hat{i} + 3 \hat{j} - 6\hat{k}, \; 6\hat{i} - 2\hat{j} + 3 \hat{k}, \; 3 \hat{i} - 6 \hat{j} - 2 \hat{k}$ represent the sides of a triangle, then the perimeter of the triangle is:

asked Dec 19, 2018 by pady_1

0 answers

The three points whose position vectors are $\hat{i} +2 \hat{j} +3\hat{k}, \; 3 \hat{i} + 4 \hat{j} +7 \hat{k}$ and $- 3 \hat{i} - 2 \hat{j} - 5 \hat{k}$ :

asked Dec 19, 2018 by pady_1

0 answers

The probability of a man hitting a target is $\frac{1}{4}$ . If he fires 7 times, the probability of hitting the target at least twice is :

asked Dec 19, 2018 by pady_1

0 answers

A random variable $X$ has the following distribution the mean and the variance are :

asked Dec 19, 2018 by pady_1

0 answers

A coin tossed 3 times. The probability of getting head once and tails two times, is :

asked Dec 19, 2018 by pady_1

1 answer

A random variable $X$ has the following distribution the values of $k$ and $P(X < 3)$ are equal to :

asked Dec 19, 2018 by pady_1

0 answers

Two dice are thrown at a time and the sum of the numbers on them is 6. The probability of getting the number 4 on any of the dice, is :

asked Dec 19, 2018 by pady_1

1 answer

A problem in EAMCET examination is given to 3 students A, B and C whose chance of solving it are $\frac{1}{2}, \frac{1}{3}$ and $\frac{1}{4}$ respectively, the probability that the problem is solved, is :

asked Dec 19, 2018 by pady_1

0 answers

A and B are mutually exclusive events with $P(A) = \frac{1}{2} P(B)$ and $A \cup B = S$ the sample space, then $P(A)$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

The equation $r = 5 \cos \theta + 12 \sin \theta$ represents :

asked Dec 19, 2018 by pady_1

0 answers

$\begin{align} \int_0^a \sqrt{a^2 - x^2} dx \end{align}$ is equal to :

asked Dec 19, 2018 by pady_1

1 answer

The area bounded by $y = 3x$ and $y =x^2$ is (in sq unit) :

asked Dec 19, 2018 by pady_1

1 answer

$\begin{align} \int_0^{\pi/2} \sin^6 x \cos^5 x \; dx \end{align}$ is equal to :

asked Dec 19, 2018 by pady_1

1 answer

$\begin{align} \int \frac{e^x (1+x \log x)}{x}\;dx \end{align}$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

$\begin{align} \int \frac{x^5}{x^2 + 1} \;dx \end{align}$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

The value of $(127)^{1/3}$ upto 4 decimal places, is :

asked Dec 19, 2018 by pady_1

0 answers

Ask Questions, Get Answers