Explore topic-wise InterviewSolutions in Current Affairs.

Consider the following chlorides

The correct order of $S{N}_1$ reactivity is

An isotone of ${}_{36}^{86}Kr$ is _________.

Calculate de-Broglie wavelength of an electron having kinetic energy of $1\text{GeV}$. Given mass of electron $m=9.1\times {10}^{-31}\text{kg},h=6.6\times {10}^{-34}\text{Js}$ and $e=1.6\times {10}^{-19}\text{C}$

When magnesium is burned with hydrochloric acid, a pop sound is heard when a glowing splint is brought near the beaker. It is because:

At 473 K, equilibrium constant Kc for decomposition of phosphorus pentachloride, $PC{l}_{5}is8.3\times {10}^{-3}$. If decomposition is depicted as,
$PC{l}_5\left(g\right)\leftrightarrow PC{l}_3\left(g\right)+C{l}_2\left(g\right){\Delta }_r{H}^{\circ }=124.0kJmo{l}^{-1}$

Write an expression for $K_c$ for the reaction.

What is the value of $K_c$ for the reverse reaction at the same termperature?

What would be the effect on $K_c$ if
(i) more $PC{l}_5$ is added
(ii) pressure is increased?
(iii) The temperature is increased?

Find the major product in the following reaction.

Roasting is generally done in case of the following

What
type of solids are electrical conductors, malleable and ductile?

The orbital velocity of electron in the ground state is $\upsilon$ . If the electron is excited to energy state -0.54eV,

Find the number of atoms present in 4.25g of NH3.

(क) हर्ष का पिता समुद्र के किनारे रहता था। वह तरह-तरह के खिलौने एवं मालाएँ तैयार कर पास के बड़े नगर में बेच आता था। तुम अपने आस-पास के कुछ ऐसे ही लोगों के बारे में जानकारी प्राप्त करो। वे किन-किन चीजों से क्या-क्या बनाते हैं?

(ख) समुद्र से सीपी, कौड़ी, शंख, पत्थर आदि प्राप्त होते हैं। पता करो उससे और क्या-क्या चीज़ें प्राप्त होती हैं जो मनुष्य के लिए उपयोगी हैं? इसकी एक सूची बनाओ।

(ग) हर्ष और कनक ने मंजरी को समुद्र से निकाला। इसके बाद उन्होंने मंजरी को प्राथमिक उपचार दिया। पता करो तुम कौन से प्राथमिक उपचार करोगे, यदि

- किसी का हाथ गर्म चीज़ से जल जाए

- पैर में काँच घुस जाए

- कोई ज़हरीला जंतु काट ले

An important ore of magnesium is

Why are
vitamin A and vitamin C essential to us? Give their important
sources.

1. 10

Match the complex ions given in Column I with the possible isomerism given in Column II and assign the correct code.

$\begin{array}{cc}\text{Column~I}& \text{Column~II}\\ \left(Complexspecies\right)& \left(Isomerism\right)\\ A.\left[Co\right(N{H}_3{)}_{4}C{l}_2{]}^{+}& 1.Optical\\ B.cis-\left[Co\right(en{)}_{2}C{l}_2{]}^{+}& 2.Ionisation\\ C.\left[Co\right(N{H}_3{)}_5\left(N{O}_2\right)]C{l}_2& 3.Coordination\\ D.\left[Co\right(N{H}_3{)}_6\left]\right[Cr\left(CN{)}_6\right]& 4.Geometrical\end{array}$

Codes

$\begin{array}{ccccc}& A& B& C& D\\ \left(a\right)& 1& 2& 4& 3\\ \left(b\right)& 4& 3& 2& 1\\ \left(c\right)& 4& 2& 1& 3\\ \left(d\right)& 4& 1& 2& 3\end{array}$

A radiation of wavelength ${\lambda }_0$ is emitted, when an electron jumps from the third to the second orbit of hydrogen atom. For the electron jump from the fourth to the second orbit of hydrogen atom, the wavelength of the emitted radiation will be,

Consider a mixture of $n$ moles of helium gas and $2n$ moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its $\frac{C_P}{C_v}$ value will be

Which of the following image represents $\frac{77}{5}$ on the number line.

Which one of the following reactions will not yield phenol?

If uncertainty in the position of an electron is zero, the uncertainty in its momentum would be

Consider
the decay of a free neutron at rest: n
→
p+ e^–

Show
that the two-body decay of this type must necessarily give an
electron of fixed energy and, therefore, cannot account for the
observed continuous energy distribution in the β-decay
of a neutron or a nucleus (Fig. 6.19).

[Note:
The simple result of
this exercise was one among the several arguments advanced by W.
Pauli to predict the existence of a third particle in the decay
products of β-decay.
This particle is known as neutrino. We now know that it is a particle
of intrinsic spin ½ (like e^–,
p or
n),
but is neutral, and either massless or having an extremely small mass
(compared to the mass of electron) and which interacts very weakly
with matter. The correct decay process of neutron is: n
→
p + e^–+ ν]