Recent questions tagged 85

A small hole of area of cross-section $2 mm^2$ is present near the bottom of a fully filled open tank of height 2m. Taking g = $10\frac{ m}{s^2}$, the rate of flow of water through the open hole would be nearly :

asked Jul 8, 2019 by pady_1

1 answer

Silver containing lead as an impurity is removed by :

asked Dec 19, 2018 by pady_1

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The unit of radio-activity is :

asked Dec 19, 2018 by pady_1

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Which of the following reactions does not involve change in the oxidation state of the metal ?

asked Dec 19, 2018 by pady_1

1 answer

Let electronegativity, ionisation energy and electron affinity be represented as EN, IP and EA respectively. Which one of the following equation is correct according to Mulliken ?

asked Dec 11, 2018 by pady_1

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On heating benzyl amine with chloroform and ethanolic $KOH$, product obtained is :

asked Dec 11, 2018 by pady_1

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When $CH_2 = CH - COOH$ is reduced with $LiAlH_4$, the compound obtained will be :

asked Dec 11, 2018 by pady_1

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Which type of 'defect' has the presence of cations in the interstitial sites ?

asked Dec 11, 2018 by pady_1

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The major product obtained in the following reaction is :

asked Dec 11, 2018 by pady_1

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Let $\overrightarrow{a}, \; \overrightarrow{b}$ and $\overrightarrow{c}$ be three unit vectors such that $ \overrightarrow{a} \times (\overrightarrow{b} \times \overrightarrow{c} ) = \frac{\sqrt 3}{2} (\overrightarrow{b} + \overrightarrow{c})$. If $\overrightarrow{b}$ is not parallel to $\overrightarrow{c}$, then the angle between $\overrightarrow{a}$ and $\overrightarrow{b}$ is :

asked Dec 11, 2018 by pady_1

1 answer

Let $\overrightarrow{a}$ and $\overrightarrow{b}$ be two unit vectors such that $|\overrightarrow{a} +\overrightarrow{b} |= \sqrt{3}$. If $\overrightarrow{c} = \overrightarrow{a} + 2\overrightarrow{b} + 3(\overrightarrow{a} \times \overrightarrow{b})^2$, then $2|\overrightarrow{c}|$ is equal to:

asked Dec 11, 2018 by pady_1

1 answer

Given below are the half-cell reactions : $Mn^{2+} + 2e^- \to Mn; \; E^0 = -1.18 \;V$ $2(Mn^{3+} + e^- \to Mn^{2+} ) \; ; E^0 = +1.51 \; V$ The $E^0$ for $2Mn^{2+} \to Mn + 2Mn^{3+} $ will be :

asked Dec 11, 2018 by pady_1

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The I – V characteristic of an LED is

asked Dec 11, 2018 by pady_1

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What is DDT among the following :

asked Dec 11, 2018 by pady_1

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Silver Mirror test is givn by which one of the following compounds ?

asked Dec 11, 2018 by pady_1

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Let $f : (-1, 1) \to R$ be a differentiable function with $f(0) = -1$ and $f'(0)=1$. Let $g(x) = [f(2f(x) + 2)]^2$. Then $g'(0)=$

asked Dec 11, 2018 by pady_1

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The shortest distance between the line $y - x = 1$ and the curve $x = y^2$ is

asked Nov 29, 2018 by pady_1

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This question contains Statement -1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements. Statement – I: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion. and Statement – II For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decrease with increasing Z.

asked Nov 29, 2018 by pady_1

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Identify the incorrect statement among the following :

asked Nov 29, 2018 by pady_1

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Nickel ( Z = 28 ) combines with a uninegative monodentate ligand $X^-$ to form a paramagnetic complex $[NiX_4]^{2-}$. The number of unpaired electron(s) in the nickel and geometry of this complex ion are respectively :

asked Nov 13, 2018 by pady_1

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An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be :

asked Nov 5, 2018 by pady_1

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The states of hybridization of boron and oxygen atoms in boric acis$(H_3BO_3)$ are respectively

asked Nov 5, 2018 by pady_1

1 answer

Following solutions were prepared by mixing different volumes of $NaOH$ and $HCl$ of different concentration : pH of which one of them will be equal to 1 ?

asked Aug 21, 2018 by pady_1

1 answer

Match the following sexually transmitted diseases (Column â€“ I) with their causative agent (Column â€“ II) and select the correct option

asked Aug 21, 2018 by pady_1

1 answer

Fertilization in humans is practically feasible only if

asked Aug 21, 2018 by pady_1

1 answer

Among china rose, mustard, brinjal, potato, guava, cucumber, onion and tulip, how many plants have superior ovary?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following compounds will undergo racemisation when solution of KOH hydrolysis?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following is a polar molecule ?

asked Aug 20, 2018 by pady_1

1 answer

Which one of the following is a mineral of iron ?

asked Aug 20, 2018 by pady_1

1 answer

Which of the following has the minimum bond length ?

asked Aug 16, 2018 by pady_1

1 answer

Which of the following pairs has the same size?

asked Jul 26, 2018 by pady_1

1 answer

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asked Jul 26, 2018 by pady_1

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Green chemistry means such reactions which -

asked Jul 26, 2018 by pady_1

1 answer

Which of the following presents the correct order of the acidity in the given compounds :

asked Jul 26, 2018 by pady_1

1 answer

A hypothetical electrochemical cell is shown below: $ \overset{\Theta}{A} | A^+ (xM)|| B^+ (yM)| \overset{\bigoplus}{B}$ The emf measured is +0.20V. The cell reaction is:

asked Jul 25, 2018 by pady_1

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For a first order reaction $A\to B$ the reaction rate at reactant concentration of 0.01M is found to be$2.0 \times 10^{-5} mole L^{-1} S^{-1}$. The half life period of the reaction is :-

asked Jul 24, 2018 by pady_1

1 answer

The enzyme which hydrolysis triglycerides to fatty acids and glycerol is called :-

asked Jul 24, 2018 by pady_1

1 answer

The number of unpaired electrons in the complex ion $[CoF_6]^{3–}$ is : (Atomic No. of Co = 27)

asked Jul 24, 2018 by pady_1

1 answer

IUPAC name of the following is $CH_2$ = CH – $CH_2$ – $CH_2$ – C $\equiv$ CH

asked Jul 23, 2018 by pady_1

1 answer

Which of the following will give maximum number of isomers : -

asked Jul 20, 2018 by pady_1

1 answer

Which of the following statement is correct for the stability of ions of ethyl alcohol and phenol :

asked Jul 20, 2018 by pady_1

1 answer

Maximum oxidation state will be of :

asked Jun 15, 2018 by pady_1

1 answer

car: road : : train : ________

asked Dec 31, 2015 by pady_1

1 answer

What is the Median of 3, 4, 7, 9, 12, 15

asked Dec 31, 2015 by pady_1

0 answers

Vandita purchased 43 pins to share with her classmates. If it cost her Rs.6.88 to buy them, what is the price of each one?

asked Dec 31, 2015 by pady_1

1 answer

Pancho had 79 pieces of candy. He gave 3 pieces each to 7 friends. How many pieces of candy does Pancho have left?

asked Dec 31, 2015 by pady_1

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