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Class 12th Chemistry

Tyndall effect is more effectively shown by:

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Vishal Baghel

Contributor-Level 10

Tyndall effect is more effectively shown by lyophobic colloidal solution.

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Class 12th Chemistry

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?

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Vishal Baghel

Contributor-Level 10

Type of back bonding:-

Therefore order of back bonding strength =>

BF₃ > BCl₃ > BBr₃ > Bl₃

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Class 12th Chemistry

Which of the following is not a correct statement for primary aliphatic amines?

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Vishal Baghel

Contributor-Level 10

The intermolecular association which is H-bonding is more prominent in case of primary amine as compared to secondary amines due to the availability of two hydrogen atom

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Class 12th Chemistry

The nature of oxides V₂O₃ and CrO is indexed as ' X' and 'Y' type respectively. The correct set of X and Y is:

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Vishal Baghel

Contributor-Level 10

V₂O₃ – Basic

CrO – Basic

Metal oxides are generally basic in nature but if more electronegative element are connected through central atom then deficiency of electron occurs on central atom and it behaves as acidic in nature.

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Class 12th Chemistry

In the following sequence of reaction the P is:

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Class 12th Physics Alternating Current

An ac circuit has an inductor and a resistor of resistance R in series, such that X_L = 3R. Now, a capacitor is added in series such that X_C = 2R. The ratio of new power factor with the old power factor of the circuit is The value of x is_______.

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alok kumar singh

Contributor-Level 10

$c o s ?_{1} = \frac{R}{\sqrt[]{R^{2} + {(3 R)}^{2}}} = \frac{1}{\sqrt[]{10}}$

$c o s ?_{2} = \frac{R}{\sqrt[]{R^{2} + {(3 R - R)}^{2}}} = \frac{1}{\sqrt[]{2}}$

$\Rightarrow \frac{c o s ?_{2}}{c o s ?_{1}} = \frac{\sqrt[]{10}}{\sqrt[]{2}} = \sqrt[]{5} \Rightarrow x = 1$

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Class 12th Chemistry

The structure of the starting compound P used in the reaction given below is:

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Vishal Baghel

Contributor-Level 10

This is chloroform reaction.

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8 months ago

Class 12th Chemistry

The correct statement about (A), (B), (C) and (D) is:

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Vishal Baghel

Contributor-Level 10

B and C are tranquilizers

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Class 12th English

Accountant, Manager, Sweeper, CEO, Software engineer and Technician are sitting around a circle facing the centre for a forest meeting. Accountant, who is to the immediate left of CEO, is not the neighbor of Sweeper. Software engineer, the neighbour of Sweeper is not the neighbour of Manager. Technician is between CEO and Manager.

What is the position of Software engineer?

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Payal Gupta

Contributor-Level 10

Immediate right of sweeper

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Class 12th Physics

A zener diode of power rating 2W is to be used as a voltage regulator. If the zener diode ha s breakdown of 40V and its has to regulate voltage fluctuated between 6 V and 14 V, the value of R_s for safe operation should be_______ $Ω .$

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alok kumar singh

Contributor-Level 10

Maximum current through zener diode,

$i = \frac{2}{10} = 0.2 A$

When unregulated voltage is 14V,

Potential difference across Rs,

V_S = 14 – 10 = 4V

$R_{S} = \frac{V_{S}}{i} = \frac{4}{0.2} = 20 Ω$

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