Recent questions tagged 72

Pick the wrong answer in the context with rainbow.

asked Jul 8, 2019 by pady_1

1 answer

Which of the following solutions cannot act as a buffer ?

asked Dec 19, 2018 by pady_1

0 answers

The number of $C-C$ sigma bonds present in 1-butyne is :

asked Dec 19, 2018 by pady_1

0 answers

Which of the following reacts with $BCl_3$ to form diborane ?

asked Dec 19, 2018 by pady_1

0 answers

Chloroethane reacts with $X$ to form diethyl ether. What is $X$ ?

asked Dec 11, 2018 by pady_1

0 answers

At a specific instant emission of radioactive compound is deflected in a magnetic field. The compound can emit : (i) electrons (ii) protons (iii) $He^{2+}$ (iv) neutrons The emission at the instant can be :

asked Dec 11, 2018 by pady_1

0 answers

The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by :

asked Dec 11, 2018 by pady_1

0 answers

At $518^{\circ}C$, the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of $363 $ Torr, was $1.00 \; Torr\;s^{-1}$ when $5\%$ had reacted and $0.5\; Torr\; s^{-1}$ when $33\%$ had reacted. The order of the reaction is :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following species is not paramagnetic?

asked Dec 11, 2018 by pady_1

1 answer

Consider $f(x) = \tan^{-1} \begin{pmatrix} \sqrt{\frac{1+\sin x}{1 - \sin x}} \end{pmatrix}, x \in (0, \frac{\pi}{2})$. A normal to $y = f(x)$ at $x = \frac{\pi}{6}$ also passes through the point :

asked Dec 11, 2018 by pady_1

2 answers

If Rolle's theorem holds for the function $f(x) = 2x^3 + bx^2+cx,\; x \in [-1, 1]$, at the point $x= \frac{1}{2}$, then $2b+c$ equals :

asked Dec 11, 2018 by pady_1

1 answer

For the reaction, $SO_{2(g)} + \frac{1}{2}O_{2(g)} \leftrightharpoons SO_{3(g)}$, if $K_P = K_C(RT)^x$ where the symbols have usual meaning then the value of $x$ is: (assuming ideality)

asked Dec 11, 2018 by pady_1

0 answers

The graph between angle of deviation (δ) and angle of incidence (i) for a triangular prism is represented by:

asked Dec 11, 2018 by pady_1

0 answers

The equilibrium constant $(K_C)$ for the reaction $N_2(g) + O_2(g) \to 2NO (g)$ at temperature T is $ 4 \times 10^{-4}$. The value of $K_C$ for the reaction, $NO(g) \to 1/2 N_2 (g) + 1/2 O_2 (g)$ at the same temperature is :

asked Dec 11, 2018 by pady_1

0 answers

Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at $-6^{\circ} C$ will be : [$K_f$ for water = 1.86 $K \; kg\; mol^{-1}$, and molar mass of ethylene glycol = 62 $g\; mol^{-1}$ )

asked Dec 11, 2018 by pady_1

0 answers

Four numbers are chosen at random (without replacement) from the set $\{1, 2, 3, ..., 20\}$. Statement-1 : The probability that the chosen numbers when arranged in some order will form an AP is $\frac{1}{85}$. Statement-2 : If the four chosen numbers from an AP, then the set of all possible values of common difference is $\{ \pm1, \pm 2, \pm 3, \pm 4, \pm 5 \}$.

asked Dec 11, 2018 by pady_1

0 answers

In a binomial distribution $B ( n, p = \frac{1}{4})$, if the probability of at least one success is greater than or equal to $\frac{9}{10}$, then $n$ is greater than

asked Nov 29, 2018 by pady_1

0 answers

If a strong diffraction peak is observed when electrons are incident at an angle ‘i’ from the normal to the crystal planes with distance ‘d’ between them (see figure), de Broglie wavelength $\lambda_{dB}$ of electrons can be calculated by the relationship (n is an integer)

asked Nov 29, 2018 by pady_1

0 answers

A circular disc of radius $R$ is removed from a bigger circular disc of radius $2R$, such that the circumference of the discs coincide. The centre of mass of the new disc is $\frac{\alpha}{R}$ from the centre of the bigger disc. The value of $\alpha$ is :

asked Nov 29, 2018 by pady_1

0 answers

The increasing order of stability of the following free radicals is :

asked Nov 13, 2018 by pady_1

0 answers

If the equation $a_n\; x^n + a_{n-1}\; x^{n-1} + ....+ a_1x = 0$, $a_1 \neq 0, n \geq 2$, has a positive root $x=\alpha$, then the equation $n a_n x^{n-1} + (n-1) a_{n-1}\; x^{n-2} + . . . + a_1 = 0$ has a positive root, which is :

asked Nov 5, 2018 by pady_1

0 answers

A charged particle of mass m and charge q travels on a circular path of radius r that is perpendicular to a magnetic field B. The time taken by the particle of complete one revolution is :

asked Nov 5, 2018 by pady_1

0 answers

Three forces $\overrightarrow{P}, \overrightarrow{Q}$ and $\overrightarrow{R}$ acting along $IA, \; IB$ and $IC$, where $I$ is the incentre of a $\Delta ABC$, are in equilibrium. Then $\overrightarrow{P} : \overrightarrow{Q} : \overrightarrow{R}$ is

asked Nov 5, 2018 by pady_1

0 answers

Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?

asked Aug 21, 2018 by pady_1

2 answers

Adult human RBCs are enucleate. Which of the following statements(s) is / are most appropriate explanation for this feature ? (a) They do not need to reproduce (b) They are somatic cells (c) They do not metabolize (d) All their internal space is available for oxygen transport

asked Aug 21, 2018 by pady_1

1 answer

In a chloroplast the highest number of protons are found in

asked Aug 21, 2018 by pady_1

1 answer

Metagenesis refers to -

asked Aug 21, 2018 by pady_1

1 answer

Among the following complexes the one which shows Zero crystal field stabilizations energy (CFSE) :

asked Aug 20, 2018 by pady_1

2 answers

$KMnO_4$ can be prepared from $K_2MnO_4$ as per the reaction : $ 3MnO_4^{2-} + 2H_2O \rightleftharpoons 2MnO_4^- + MnO_2 + 4 OH^-$. The reaction can go to completion by removing $OH^-$ ions by adding -

asked Aug 20, 2018 by pady_1

1 answer

Aluminium is extracted from alumina $(Al_2O_3)$ by electrolysis of a molten mixture of :

asked Aug 20, 2018 by pady_1

1 answer

Which of the following pairs of metals is purified by van Arkel method ?

asked Aug 16, 2018 by pady_1

1 answer

Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

asked Jul 26, 2018 by pady_1

1 answer

In the case of alkali metals, the covalent character decreases in the order :

asked Jul 26, 2018 by pady_1

1 answer

Volume occupied by one molecule of water ($density = 1g cm^{ –3}$) is :

asked Jul 26, 2018 by pady_1

1 answer

Which one of the following ionic species has the greatest proton affinity to form stable compound:

asked Jul 26, 2018 by pady_1

1 answer

Which one of the following is a peptide hormone:-

asked Jul 25, 2018 by pady_1

1 answer

Which of the following undergoes nucleophilic substitution exclusively by$ SN^1$mechanism :

asked Jul 24, 2018 by pady_1

1 answer

Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is :-

asked Jul 24, 2018 by pady_1

1 answer

The molar heat capacity of water at constant pressure, C, is $75 \;JK^{–1} mol^{–1}$. When 1.0 KJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is :

asked Jul 24, 2018 by pady_1

0 answers

General electronic configuration of lanthanides is

asked Jul 23, 2018 by pady_1

1 answer

A human body required the 0.01 Curie activity of radioactive substance after 24 hours. Half life of radioactive is 6 hours. Then max. activity of radioactive substance that can be injected will be : -

asked Jul 20, 2018 by pady_1

1 answer

Conjugate acid of $NH{_2^-}$ :

asked Jul 20, 2018 by pady_1

1 answer

Density of which of the following substance not decreases on adding $Br_2$ vapours :

asked Jun 15, 2018 by pady_1

1 answer

Find the odd one out

asked Dec 31, 2015 by pady_1

0 answers

, The bar graph shows the usual method of transport to school for the students in a class. How many students are there altogether in the class?

asked Dec 31, 2015 by pady_1

1 answer

Find the breadth of a platform of 20 m in length having an area of 380 sq. m.

asked Dec 31, 2015 by pady_1

0 answers

A factory makes 1440 shirts every week. How many items are manufactured in $\large\frac{1}{2}$ year?

asked Dec 31, 2015 by pady_1

0 answers

Maria sold a bicycle for \$ 24900 at a profit of \$ 600. Find the price at which she bought it.

asked Dec 31, 2015 by pady_1

0 answers

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