Ask & Answer

Ask & Answer: India's Largest Education Community

1000+ExpertsQuick ResponsesReliable Answers

Your Question

Edit

Add relevant tags to get quick responses. Cancel Post

All Questions

New Question

9 months ago

Probability Maths

The sum and product of the main and variance of a binomial distribution are 82.5 and 1350 respectively. Then the number of trials in the binomial distribution is……………

0 Follower 2 Views

New Question

9 months ago

Haloalkanes and Haloarenes Chemistry

The number of chlorine atoms in bithionol is_____________.

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

Structure of Bithinol is;

0 0

New Question

9 months ago

Organic Chemistry - Some Basic Principles and Tech Chemistry

The number of stereoisomers formed in a reaction of

$(\pm) P h (C = O) C (O H) (C N) P h w i t h H C N i s____________.$

0 Follower 7 Views

Payal Gupta

Contributor-Level 10

0 0

New Question

9 months ago

Alcohol Phenol And Ethers Chemistry

A 1.84 mg sample of polyhydric alcoholic compound ‘X’ of molar mass 92.0 g/mol gave 1.344mL of H₂ gas at STP. The number of alcoholic hydrogens present in compound ‘X’ is_________.

0 Follower 18 Views

Payal Gupta

Contributor-Level 10

Mole of polyhydric alcohol = $\frac{1.84 \times 1 0^{- 3}}{92} = 2.0 \times 1 0^{- 5} m o l e .$

Mole of H₂ gas produced = $\frac{1.344}{22400} = 6.0 \times 1 0^{- 5} m o l e .$

No of OH gp present = $\frac{6.0 \times 1 0^{- 5}}{2.0 \times 1 0^{- 5}} = 3$

0 0

New Question

9 months ago

P Block Elements Chemistry

Consider the following sulphur based oxoacids.

H₂SO₃, H₂SO₄, H₂S₂O₈ and H₂S₂O₇.

Amongst these oxoacids, the number of those with peroxo (O-O) bond is______________.

0 Follower 4 Views

Payal Gupta

Contributor-Level 10

Only H₂S₂O₈ has per-oxo bond.

0 0

New Question

9 months ago

Chemistry Coordination Compounds Chemistry

Sum of oxidation state (magnitude) and coordination number of cobalt in $N a [C o (b p y) C l_{4}]$ is___________.

0 Follower 3 Views

Payal Gupta

Contributor-Level 10

Oxidation state of Co = 3

And co-ordination No = 6

Sum = 3 + 6 = 9

0 0

New Question

9 months ago

Chemistry Class 12th

Assuming 1 $μ g$ of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the tree after 100 years is __________× 10^-1 $μ g$

[Given: In 10 = 2.303; log 2 = 0.30]

0 Follower 14 Views

Payal Gupta

Contributor-Level 10

$λ t = l n \frac{N_{o}}{N_{t}}$

$\frac{0.693}{t_{1 / 2}} \times t = l n \frac{1}{N_{t}}$

Or $\frac{0.693 \times 100}{30} = l n \frac{1}{N_{t}}$

$\frac{1}{N_{t}} = 10$

$∴ N_{t} = \frac{1}{10} = 0.1$

Or N_t = 1 × 101 $μ g$

0 0

New Question

9 months ago

Nernst Equation Chemistry Electrochemistry

For a cell, $C u (s) | C u^{2 +} (0.001 M) | | A g^{+} (0.01 M) | A g (s)$

The cell potential is found to be 0.43V at 298 K. The magnitude of standard electrode potential for Cu²⁺ / Cu is______________ × 10^-2V.

$[G i v e n : E_{A g^{+} / A g}^{Θ} = 0.80 V a n d \frac{2.303 R T}{F} = 0.06 V]$

0 Follower 3 Views

New Question

9 months ago

Solutions Chemistry

1.80g of solute A was dissolved in 62.5cm³ of ethanol and freezing point of the solution was found to be 155.1 K . The molar mass of solute A is __________g mol^-1.

[Given: Freezing point of ethanol is 156.0 K. Density of ethanol is 0.80 g cm^-3. Freezing point depression constant of ethanol is 2.00 K kg mol^-1]

0 Follower 3 Views

Payal Gupta

Contributor-Level 10

$Δ T_{f} = K_{f} \times m$

$(156 - 155.1) = 2 \times \frac{1.8}{M W} \times \frac{1000}{(62.5 \times 0.8)}$

0.9 = $\frac{2 \times 1.8 \times 1000}{M W \times 50}$

$∴ M W = 80 g m / m o l$

0 0

New Question

9 months ago

Hybridization Chemistry Chemical Bonding and Molecular Structure

Consider, PF₅, BrF₅, PCl₃, SF₆, ${[I C l_{4}]}^{-}$ , CIF₃ and IF₅.

Amongst the above molecule(s) / ion(s), the number of molecule(s) / ion(s) having sp³d² hybridisation is_____________.

0 Follower 15 Views

Payal Gupta

Contributor-Level 10

Following have the sp³d² hybridisation

0 0

New Question

9 months ago

Biyani Girls B.Ed College Colleges in Jaipur

Which courses are offered by Biyani Girls B.Ed. College?

0 Follower 3 Views

abhishek gaurav

Contributor-Level 9

Biyani Girls BEd College has many undergraduate and postgraduate programmes including BEd, BA, BSc (Biotech/Mathematics/Bio), BBA, BCA, BCom, MA, MSc, MCom, and MEd programmes. These programmes involve many specialisations and enable a choice of freedom and flexibility to students. Candidates need to take entrance for these courses, such as PTET and MPET.

0 0

New Question

9 months ago

States of Matter Chemistry

‘x’ g of molecular oxygen(O₂) is mixed with 200g of neon (Ne). The total pressure of the non-reactive mixture of O₂ and Ne in the cylinder is 25 bar. The partial pressure of Ne is 20 bar at the same temperature and volume. The value of ‘x’ is_________.

0 Follower 6 Views

Payal Gupta

Contributor-Level 10

Po₂ = P_Total - $P_{N_{2}}$

= 25 – 20 = 5bar

Po₂ = $\frac{n_{O_{2}}}{n_{O_{2}} + n_{N e}} \times P_{T o t a l}$

$5 = (\frac{x / 32}{x / 32 + \frac{200}{20}}) \times 25 \Rightarrow x = 80 g m$

0 0

New Question

9 months ago

Biyani Girls B.Ed College Colleges in Rajasthan

Is there any entrance exam at Biyani Girls B.Ed. College?

0 Follower 2 Views

abhishek gaurav

Contributor-Level 9

Yes, Biyani Girls B.Ed. College does not give consideration to entrance exams in some courses. BEd and MEd also need the score of PTET and MPET respectively. BA or BCom is an example of other UG programmes that might not require an entrance. The eligibility should be checked course-specific and then applied.

0 0

New Question

9 months ago

Electromagnetic Induction Physics Ncert Solutions Class 12th

A capacitor of capacitance 500 $μ F$ is charged completely using a dc supply of 100 V. It is now connected to an inductor of inductance 50 mH to form an LC circuit. Then maximum current in LC circuit will be_______ A.

0 Follower 4 Views

Payal Gupta

Contributor-Level 10

C = 500 $μ F,$ V = 100 v, L = 50 mH

In this LC – oscillation

q = q₀ cos $ω t$

$i = \frac{- d q}{d t} = q_{0} ω s i n ω t ω = \frac{1}{\sqrt[]{2 c}} = \frac{1}{\sqrt[]{50 \times 1 0^{- 3} \times 5 \times 1 0^{- 4}}}$

= $\frac{1000}{5} = 200$

So, i_max = $q_{0} ω = 500 \times 1 0^{6} \times 100 \times 200$

= 10A

0 0

New Question

9 months ago

Physics Nuclei Physics

Two radioactive materials A and B have decay constants 25 $λ$ and 16 $λ$ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of B to that of A will be “e” after a time $\frac{1}{a λ} .$ The value of a is__________.

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

$λ_{A} = 25 λ,$ $λ_{B} = 16 λ$

At t = 0 N_A = N_B = N₀

after t = $\frac{1}{a λ} : - \frac{N_{B}}{N_{A}} = \frac{N_{0} e^{- 16 λ t}}{N_{0} e^{- 25 λ t}} = e^{(25 λ - 16 λ) t}$

e = $e^{(9 λ \frac{1}{a λ})}$

$\Rightarrow \frac{9}{a} = 1 \Rightarrow a = 9$

0 0

New Question

9 months ago

Biyani Girls B.Ed College Colleges in Jaipur

What documents are required during admission to Biyani Girls B.Ed. College?

0 Follower 2 Views

abhishek gaurav

Contributor-Level 9

At the time of admission in Biyani Girls B.Ed. College the candidates are required to upload their caste certificate (in case of SC/ST), copies of marksheet of Class 10, 12, graduation and a formal passport size photograph with a white background.

0 0

New Question

9 months ago

Physics Ncert Solutions Class 12th Semiconductor Electronics: Materials, Devices and

A 8 V Zener diode along with a series resistance R is connected across a 20V supply (as shown in the figure). If the maximum Zener current is 25 mA, then the minimum value of R will be_______ $Ω$ .

0 Follower 3 Views

Payal Gupta

Contributor-Level 10

$i_{(z e n e r - m a x)} = 25 m A$

20 – i_max R – 8 = 0

i_max R = 12

At minimum zener current $(μ A) : -$

$20 - i_{m i n} R - i_{m i n} R_{L} = 0$

$\frac{R}{R_{L}} = \frac{12}{8} = \frac{3}{2}$

$l_{m i n} R = 12$

$i_{m i n} R_{L} = 8$

At maxm zener current –

$20 - i_{m a x} R - 8 = 0$

$i_{L} = O {a s i_{z} m a x^{m} = 25 m A}$

i_maxR = 12v

25 × 103 R = 12

$R = \frac{12 \times 1 0^{3}}{25} = 12 \times 40 = 480 Ω$

0 0

New Question

9 months ago

Physics Ncert Solutions Class 12th Semiconductor Electronics: Materials, Devices and

The metallic bob of simple pendulum has the relative density. 5 The time period of this pendulum is 10 s. If the metallic bob is immersed in water, then the new time period becomes $5 \sqrt[]{x} s .$ The value of x will be_______.

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

g_eff = g – $(\frac{ρ_{w}}{ρ_{b}}) g$

$T = 2 π \sqrt[]{\frac{l}{g}}$

$T' = 2 π \sqrt[]{\frac{l}{g_{e f f}}}$

$\Rightarrow T' = \sqrt[]{\frac{5}{4}} T$

= $\sqrt[]{\frac{5}{4}} \times 10$

= $5 \sqrt[]{5} s e c$

So, x = 5

0 0

New Question

9 months ago

Physics Oscillations Physics

The speed of a transverse wave passing through a string of length 60 cm and mass 10g is 60 ms^-1. The area of cross-section of the wire is 2.0 mm² and its Young’s modulus is 1.2 × 10¹¹ Nm^-2. The extension of the wire over its natural length due to its tension will be x × 10^-5 m. The value of x is________.

0 Follower 4 Views

Payal Gupta

Contributor-Level 10

m = 10g

$l = 50 c m$

A = 2mm²

Y = 1.2 × 10¹¹N/m²

$Δ x = x \times 1 0^{- 5} m$

As, $\frac{T}{A} = Y \frac{Δ x}{l}$

$Δ x = \frac{T l}{A Y}$

$T l = V^{2} m$

= $\frac{V^{2} m}{A Y}$

$= \frac{3600 \times 10 \times 1 0^{- 3}}{2 \times 1 0^{- 6} \times 1.2 \times 1 0^{11}} = \frac{1800 \times 1 0^{- 3} \times 1 0^{6}}{1.2}$

$= \frac{18}{12} \times 1 0^{- 4} = \frac{3}{2} \times 1 0^{- 4} = 15 \times 1 0^{- 5} m$

So, x = 15

0 0

New Question

9 months ago

Physics Mechanical Properties of Solids Physics

A modulating signal 2sin (6.28 × 10⁶)t is added to the carrier signal 4 sin(12.56 ×10⁹)t for amplitude modulation. The combined signal is passed through a non-linear square law device. The output is then passes through a band pass filter. The bandwidth of the output signal of band pass filter will be_________ MHz.

0 Follower 2 Views