Recent questions tagged 88

A particle moving with velocity $\overrightarrow {\rm{V}}$ is acted by three forces shown by the vector triangle PQR. The velocity of the particle will :

asked Jul 10, 2019 by pady_1

2 answers

Hydrolysis of trichloromethane with aqueous KOH gives :

asked Dec 19, 2018 by pady_1

0 answers

Which of the following covalent molecules is an exception to octet rule ?

asked Dec 19, 2018 by pady_1

0 answers

The pH of an aqueous solution of a salt is 10. The salt is :

asked Dec 19, 2018 by pady_1

1 answer

Bond dissociation energies of $HF, \; HCl,\; HBr$ follow the order .....

asked Dec 11, 2018 by pady_1

0 answers

Cyanide process is used for the extraction of :

asked Dec 11, 2018 by pady_1

0 answers

The general formula $C_n H_{2n} O_2$ could be for open chain :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following compounds contain(s) no covalent bond(s) ? $KCl, \; PH_3,\; O_2, \; B_2H_6, \;H_2SO_4$

asked Dec 11, 2018 by pady_1

0 answers

Sodium salt of an organic acid 'X' produces effervescence with conc. $H_2SO_4$. 'X' reacts with the acidified aqueous $CaCl_2$ solution to give a white precipitate which decolourises acidic solution of $KMnO_4$. 'X' is :

asked Dec 11, 2018 by pady_1

0 answers

If $0 \leq x \leq 2\pi$, then the number of real values of $x$, which satisfy the equation $\cos x+\cos 2x+\cos 3x+\cos 4x=0$, is :

asked Dec 11, 2018 by pady_1

1 answer

In a $\Delta ABC, \; \frac{a}{b} = 2 + \sqrt{3}$ and $\angle{C} = 60^{\circ}$. Then the ordered pair $(\angle{A}, \angle{B})$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

Among the following oxoacids, the correct decreasing order of acid strength is:

asked Dec 11, 2018 by pady_1

0 answers

Diameter of plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is $2 \times 10^8$ m/s, the focal length of the lens is :

asked Dec 11, 2018 by pady_1

0 answers

Iodoform can be prepared from all except :

asked Dec 11, 2018 by pady_1

0 answers

In a face centred cubic lattice, atom A occupies the corner position and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is :

asked Dec 11, 2018 by pady_1

0 answers

An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colour is

asked Dec 11, 2018 by pady_1

0 answers

Statement -1: The variance of first n even natural numbers is $\frac{n^2-1}{4}$ Statement -2 :The sum of first $n$ natural numbers is $\frac{n(n+1)}{2}$ and the sum of squares of first $n$ natural numbers is $\frac{n(n+1)(2n+1)}{6}$

asked Nov 29, 2018 by pady_1

1 answer

78. A working transistor with its three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?

asked Nov 29, 2018 by pady_1

0 answers

The secondary structure of a protein refers to :

asked Nov 29, 2018 by pady_1

0 answers

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If $T_i$ is the initial temperature and $T_f$ is the final temperature, which of the following statements is correct ?

asked Nov 13, 2018 by pady_1

0 answers

Consider an endothermic reaction $X \to Y$ with the activation energies $E_b$ and $E_f$ for the backwarrd and forward reactions respectively. In general :

asked Nov 5, 2018 by pady_1

0 answers

As the temperature is raised from $20^{\circ}C$ to $40^{\circ}C$, the average kinetic energy of neon atoms changes by a factor of which of the following?

asked Nov 5, 2018 by pady_1

1 answer

Given var der Waals constant for $NH_3, H_2, O_2$ and $CO_2$are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied ?

asked Aug 21, 2018 by pady_1

1 answer

Identify the wrong statement in context of heartwood :

asked Aug 21, 2018 by pady_1

1 answer

Following are the two statements regarding the origin of life - (a) The earliest organisms that appeared on the earth were non-green and presumably anaerobes (b) The first autotrophic organisms were the chemoautotrophs that never released oxygen Of the above statements which one of the following options is correct ?

asked Aug 21, 2018 by pady_1

2 answers

Chromatophores take part in -

asked Aug 21, 2018 by pady_1

1 answer

Which one is most reactive towards Nucleophilic addition reaction ?

asked Aug 20, 2018 by pady_1

2 answers

asked Aug 20, 2018 by pady_1

1 answer

In the following reaction : The major product is :

asked Aug 20, 2018 by pady_1

1 answer

What is the product obtained in the following reaction ?

asked Aug 16, 2018 by pady_1

1 answer

Standard entropies of $X_2$, $Y_2$ and $XY_3$ are $60, 40 $ and $50 JK ^{–1} mol^{–1}$ respectively. For the reaction $\frac{1}{2} X_2 +\frac{3}{2}Y_2 \leftrightharpoons XY_3, \Delta H = -30 kJ$ to be at 2 equilibrium, the temperature should be:

asked Jul 26, 2018 by pady_1

1 answer

Consider the following reaction $Ethanol \xrightarrow{PBr_3} X \xrightarrow{ alc. KOH} Y \xrightarrow[{(i)\;H_2O ,\; Heat}]{(i)\; H_2SO_4 room\; temperature} Z$ The product Z is :

asked Jul 26, 2018 by pady_1

0 answers

The correct order of increasing bond angles in the following triatomic species is :

asked Jul 26, 2018 by pady_1

1 answer

Consider the following compounds : (i) $C_6H_5COCl$ (ii) <img src =" "/> The correct decreasing order of their reactivity towards hydrolysis is

asked Jul 26, 2018 by pady_1

1 answer

Which of the following is more basic than aniline:-

asked Jul 25, 2018 by pady_1

1 answer

The major organic product formed from the following reaction

asked Jul 24, 2018 by pady_1

0 answers

Among K, Ca Fe and Zn, the element which can form more than one binary compound with chlorine is :-

asked Jul 24, 2018 by pady_1

1 answer

Among the following which is not the $\pi$-bonded organometallic compound :

asked Jul 24, 2018 by pady_1

1 answer

In the following reaction product 'P' is :

asked Jul 23, 2018 by pady_1

1 answer

Which statement is incorrect : -

asked Jul 20, 2018 by pady_1

1 answer

Which species does not exhibits paramagnetism :

asked Jul 20, 2018 by pady_1

2 answers

In the Haemoglobin (Molecular wt = 67200) iron found 0.33% (by weight). The number of iron atom will be in its one molecule :

asked Jun 15, 2018 by pady_1

1 answer

Which is the next term in this series ? 5, 8, 12, 17, 23, 30, ...

asked Dec 31, 2015 by pady_1

1 answer

The table shows the average temperatures for London, England, for each month of the year. What is the mean of these values?

asked Dec 31, 2015 by pady_1

1 answer

Find the area of a rectangle whose length is 17 cm and breadth is 85 mm.

asked Dec 31, 2015 by pady_1

1 answer

Tom planted vegetables in a rectangular garden that was 25 feet long and 15 feet wide. He used 1/3 of the area for corn and $\large\frac{1}{5}$ of it for peas. How many square feet are left for other vegetables?

asked Dec 31, 2015 by pady_1

1 answer

For a school fundraiser, Luke needs to sell 40 rolls of gift wrap. So far, he has sold 5 rolls to his grandmother, 2 rolls to his uncle, and 6 rolls to a neighbour. How many more rolls of gift wrap does Luke need to sell?

asked Dec 31, 2015 by pady_1

1 answer

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