Recent questions tagged 90

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1m away, was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water$(\mu _{water} = \frac{4}{3})$

asked Jul 8, 2019 by pady_1

1 answer

In Wurtz reaction the reagent used is :

asked Dec 19, 2018 by pady_1

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A solid organic compound $X$ on heating is directly converted into the vapour phase which on cooling solidifies. The best method for purifying $X$ is :

asked Dec 19, 2018 by pady_1

1 answer

Which of the following has the highest first IP ?

asked Dec 19, 2018 by pady_1

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What are the oxidation numbers of nitrogen in $NH_4NO_3$ ?

asked Dec 11, 2018 by pady_1

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A metal M forms water soluble $MSO_4$ and inert $MO$. $MO$ in aqueous solution forms insoluble $M(OH)_2$ soluble in $NaOH$. Metal $M$ is :

asked Dec 11, 2018 by pady_1

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Among the following four structures $I$ to $IV$ : it is true that :

asked Dec 11, 2018 by pady_1

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According to molecular orbital theory, which of the following will not be a viable molecule ?

asked Dec 11, 2018 by pady_1

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Which of the following, upon treatment with tert-BuONa followed by addition of bromine water, fails to decolourize the colour of bromine ?

asked Dec 11, 2018 by pady_1

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The Boolean Expression $(p \wedge \sim q) \vee q \vee(\sim p \wedge q)$ is equivalent to :

asked Dec 11, 2018 by pady_1

1 answer

The contrapositive of the statement "If it is raining, then I will not come", is :

asked Dec 11, 2018 by pady_1

1 answer

The most suitable reagent for the conversion of $R-CH_2- OH \to R - CHO$ is:

asked Dec 11, 2018 by pady_1

1 answer

Two short bar magnets of length 1 cm each have magnetic moments $1.20\; Am^2$ and $1.00\; Am^2 $ respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid - point O of the line joining their centres is close to (Horizontal component of earth’s magnetic induction is $3.6 \times 10^{–5} Wb/m^2$)

asked Dec 11, 2018 by pady_1

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In the given transformation, which of the following is the most appropriate reagent ?

asked Dec 11, 2018 by pady_1

1 answer

Identify the compound that exhibits tautomerism.

asked Dec 11, 2018 by pady_1

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The circle $x^2+ y^2 = 4x + 8y + 5$ intersects the line $3x - 4y = m$ at two points if

asked Dec 11, 2018 by pady_1

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Let A be a $2 \times 2$ matrix Statement-1: adj (adj A) = A Statement-2 : |adj A| = |A|

asked Nov 29, 2018 by pady_1

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Consider a block of conducting material of resistivity â€˜pâ€™ shown in the figure. Current â€˜Iâ€™ enters at â€˜Aâ€™ and leaves from â€˜Dâ€™. We apply superposition principle to find voltage â€˜$\triangle$Vâ€™ developed between â€˜Bâ€™ and â€˜Câ€™. The calculation is done in the following steps: (i) Take current â€˜Iâ€™ entering from â€˜Aâ€™ and assume it to spread over a hemispherical surface in the block (ii) Calculate field E(r) at distance â€˜râ€™ from A by using Ohmâ€™s law E = pj, where j is the current per unit area at â€˜r (iii) From the â€˜râ€™ dependence of E(r), obtain the potential V(r) at r. (iv) Repeat (i), (ii) and (iii) for current â€˜Iâ€™ leaving â€˜Dâ€™ and superpose results for â€˜Aâ€™ and â€˜Dâ€™. QUESTION : For current entering at A, the electric field at a distance â€˜râ€™ from A is

asked Nov 29, 2018 by pady_1

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In the chemical reaction, $CH_3CH_2NH_2 + CHCl_3 + 3 KOH \to$ $(A) + (B) + 3H_2O$, the compounds $(A)$ and $(B)$ are respectively :

asked Nov 29, 2018 by pady_1

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Rate of a reaction can be expressed by Arrhenius equation as : $k = Ae^{-E/RT}$ In this equation, $E$ represents :

asked Nov 13, 2018 by pady_1

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The volume of a colloidal particle, $V_C$ as compared to the volume of a solute particle in a true solution $V_S$ could be :

asked Nov 5, 2018 by pady_1

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Which one of the following aqueous solutions will exhibit highest boiling point ?

asked Nov 5, 2018 by pady_1

1 answer

Identify the major products P, Q and R in the following sequence of reactions :

asked Aug 21, 2018 by pady_1

1 answer

The process of separation and purification of expressed protein before marketing is called :

asked Aug 21, 2018 by pady_1

1 answer

Gause's principle of competitive exclusion states that

asked Aug 21, 2018 by pady_1

1 answer

A pleiotropic gene -

asked Aug 21, 2018 by pady_1

1 answer

Which of the following organic compounds has same hybridization as its combustion product -($CO_2$)?

asked Aug 20, 2018 by pady_1

1 answer

Which of the following compounds will not undergo Friedel-Craft reaction easily-

asked Aug 20, 2018 by pady_1

1 answer

Among the following compounds the one that is most reactive towards electrophilic nitration is :

asked Aug 20, 2018 by pady_1

2 answers

In Duman's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compond would be : (Aqueous tension at 300 K = 15 mm)

asked Aug 16, 2018 by pady_1

1 answer

Which one of the following compounds is a peroxide?

asked Jul 26, 2018 by pady_1

1 answer

Nitrobenzene can be prepared from benzene by using a mixture of conc.$ HNO_3$ and conc. $H_2SO_4$ . In the mixture, nitric acid acts as a/an -

asked Jul 26, 2018 by pady_1

1 answer

asked Jul 26, 2018 by pady_1

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Which one of the following on reduction with lithium aluminium hydride yield a secondary amine:

asked Jul 26, 2018 by pady_1

1 answer

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of$ NH_3$ (1.5 D) is larger than that of$ NF_$3 (0.2 D). This is because:-

asked Jul 25, 2018 by pady_1

0 answers

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction -

asked Jul 24, 2018 by pady_1

1 answer

Which one of the following statements about the zeolites is false :-

asked Jul 24, 2018 by pady_1

1 answer

Which one of the following is a free-radical substitution reaction :

asked Jul 24, 2018 by pady_1

2 answers

Reactivity order of halides for dehydrohalogenation is : -

asked Jul 23, 2018 by pady_1

1 answer

Main axis of a diatomic molecule is z, molecular orbtial $p_x$ and $p_y$ overlaps to form, which of the following orbital : -

asked Jul 20, 2018 by pady_1

2 answers

Cell reaction is spontaneous when :

asked Jul 20, 2018 by pady_1

1 answer

In $PO{_4^ {-3}}$formal charge on every oxygen atom and P-O bond order is respectively :

asked Jun 15, 2018 by pady_1

1 answer

, What was the mean score?

asked Dec 31, 2015 by pady_1

0 answers

Matthew purchased 32 pins to share with his classmates. If it cost him Rs.8 to buy them, what is the price of each one?

asked Dec 31, 2015 by pady_1

1 answer

Sanjana is reading a mystery novel and this book has 390 pages. Sanjana manages to read $\large\frac{6}{39}$ of the book every day. After 4 days, how many pages does she have left to read?

asked Dec 31, 2015 by pady_1

1 answer

Hana's uncle gave her Rs 8,338 to spend on basketball equipment. She bought 2 jerseys that cost Rs 602 each, a basketball that cost Rs 1,782, and a pair of shorts that cost Rs 564. How much money does Hana have left?

asked Dec 31, 2015 by pady_1

1 answer

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