Explore topic-wise InterviewSolutions in Current Affairs.

Minimum distance between 2 octahedral voids in hcp lattice is

A graph of vapour pressure and temperature for the three different liquids $X,Y$ and $Z$ is shown:

The following interference are made:

$\left(A\right)X$ has higher intermolecular interaction compared to $Y$.

$\left(B\right)X$ has lower intermolecular interaction compared to $Y$.

$\left(C\right)Z$ has lower intermolecular interaction compared to $Y$.

The correct interfernce(s) is/are:

Which oxide is alkaline in nature?

Vermione and Larry were in a class.



Teacher said: Absorption is a bulk phenomenon where molecules are distributed in the bulk of a substance.

Larry: If I fill my bottle with water, it must be absorbing the water because it's in the bulk of the bottle.

Vermione slapped Larry.



Why did Vermione slap Larry?

Pure benzene freezes at 5.45°C at a certain places but a 0.374 m solution of tetrachloroethane In benzene freezes at 3.55°C. The $K_f$ for benzene is

The correct order of Lewis acidity of $B{X}_3$ molecule is

If $K_p$ for the reaction, $A\left(g\right)+2B\left(g\right)\rightleftharpoons 3C\left(g\right)+D\left(g\right)$ is 0.05 atm at 1000K. Its $K_c$ in terms of unit R will be:

Identify compound X in the following sequence of reactions.

Which of the following is optically inactive?

Match the polymers given in Column I with their repeating units given in Column II.

Which of the following is not an ambident nucleophile?

$\underset{\left(i\right)Sn/HCI}{\overset{\left(ii\right)NaN{O}_2.HCI}{\to }}$ X is

Question 139

A half-life is the amount of time that it takes for a radioactive substance to decay one-half of its original quantity.

Suppose radioactive decay causes 300 grams of a substance to decrease $300\times 2^{-3}$ grams after 3 half-lives. Evaluate $300\times 2^{-3}$ to determine how many grams of the substance is left.

Explain why the expression $300\times 2^{-n}$ can be used to find the amount of the substance that remains after n half-lives.

Represent the decimal written on the gray box in fractional form.

The cation that will not be precipitated by $H_{2}S$ in the presence of dil. $HCl$ is :

In the following sequence of reactions, identify the compounds (A), (B), (C) and (D):

$N{a}_{2}C{O}_3\stackrel{S{O}_2}{\to }\left(A\right)\stackrel{N{a}_{2}C{O}_3}{\to }\left(B\right)\stackrel{S}{\to }\left(C\right)\stackrel{AgN{O}_3}{\to }\left(D\right)$

The diazonium salt of which of the following compounds will form a coloured dye on reaction with $\beta$ - Naphthol in NaOH ?

Assign oxidation numbers to the underlined elements in each of the following species:
$Na{H}_{2}P{O}_4$

$NaH\underset{–}{S}{O}_4$

$H_4{\underset{–}{P}}_2{O}_7$

$K_2\underset{–}{Mn}{O}_4$

$Ca{\underset{–}{O}}_2$

$Na\underset{–}{B}{H}_4$

$H_2{\underset{–}{S}}_2{O}_7$

$KAl\underset{–}{S}{O}_4{)}_2.12H_{2}O$

Classify
each of the following solids as ionic, metallic, molecular, network
(covalent) or amorphous.

(i)
Tetra phosphorus decoxide (P₄O₁₀)
(vii)
Graphite

(ii)
Ammonium
phosphate (NH₄)₃PO₄
(viii)
Brass

(iii)
SiC
(ix)
Rb

(iv)
I₂
(x)
LiBr

(v)
P₄
(xi)
Si

Arrange the following in increasing order of stability



$\text{(A)}(C{H}_3{)}_2\stackrel{\oplus }{C}-C{H}_{2}C{H}_3$

$\text{(B)}(C{H}_3{)}_3-\stackrel{\oplus }{C}$

$\text{(C)}(C{H}_3{)}_2-\stackrel{\oplus }{C}H$

$\text{(D)}C{H}_3-\stackrel{\oplus }{C}{H}_2$

$\text{(D)}\stackrel{\oplus }{C}{H}_3$

A solution contains $\left[I^{-}\right]=\left[B{r}^{-}\right]=0.2M$ each.
Then find the percentage of $\left[I^{-}\right]$ that has reacted when the $AgBr$ first precipitates:
Given :
$Salt{K}_{sp}(mol{L}^{-1}{)}^2$
$AgBr5\times {10}^{-13}$
$AgI8.3\times {10}^{-17}$

Treatment with lime can remove hardness of water caused by:

Question 12

If the electronic configuration of an element is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{2}4s^2$ the four electrons involved in chemical bond formation will be

(a) $3p^6$

(b) $3p^6,4s^2$

(c) $3p^6,3d^2$

(d) $3d^2,4s^2$