Electronegati...

Electronegativity Conductivity and Photoelectric Effect (Group 1)

Trending Questions

Which of the following has the highest Nucleophilicity?

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Q. Electropositivity decreases as we go down the group.

True
False

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Q. The oxidation states of

^{'} P^{'}

H_{4} P_{2} O_{7}

H_{4} P_{2} O_{5}

and

H_{4} P_{2} O_{6}

, respectively are:

$5, 4 and 3$
$7, 5 and 6$
$6, 4 and 5$
$5, 3 and 4$

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A g B r

shows both Schottky and Frenkel defect because

size of $A g >>>>> B r$
size of $A g <<<<< B r$
$A g B r$ is highly ionic
Both B and C

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Q. Which alkali metal can be preferably used in photoelectric cells

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Q. Assertion :Increasing order of covalent character among given compounds is

H g {C l}_{2} < C d {C l}_{2} < Z n {C l}_{2}

. Reason: Order of size of cations is

{Z n}^{2 +} < {C d}^{2 +} < {H g}^{2 +}

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Assertion is correct but Reason is incorrect
Assertion is incorrect but Reason is correct

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The oxidation state of $F e$ in $F e S O_{4}$ . $(N H_{4})_{2} S O_{4}$ . $6 H_{2} O$ is

+2
+1
-2
-1

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Q. Which of CFSE of a free Co(II) ion on forming the tetrahedral chloro complex

[C o C l_{4}]^{2 -}

(in the units of

Δ_{o})

-0.6
-1.2
-1.8
-2.4

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Q. In which of the following compounds, sulphur show maximum oxidation number?

$S O_{3}$
$H_{2} S_{2} O_{7}$
All have same oxidation number for sulphur
$H_{2} S O_{4}$

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Q. Among the following, the number of metal/s which can be used as electrodes in the photoelectric cell is:
(a) Li
(b) Na
(c) Rb
(d) Cs

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Q. The no. of electrons present in one mole of Azide ion are

(N_{3}^{-})

$21 N_{A}$
$20 N_{A}$
$22 N_{A}$
$43 N_{A}$

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Q. The change in enthalpy for hydration of ( i ) the chloride ion ; ( ii ) the iodide ion are :
Given :
* enthalpy change of solution of NaCl(s)

= - 2

kJ / mol.
* enthalpy change of solution of NaI(s)

= + 2

kJ / mol.
* enthalpy change of hydration of

N a^{+} (g) = - 390

kJ / mol.
* lattice enthalpy of NaCl

= - 772

kJ / mol.
* lattice enthalpy of NaI

= - 699

kJ / mol.

for $C l^{-} - 741 k J m o l^{- 1},$ for $I^{-} - 527 k J m o l^{- 1}$
for $C l^{-} - 454 k J m o l^{- 1},$ for $I^{-} 963 k J m o l^{- 1}$
for $C l^{-} - 385 k J m o l^{- 1},$ for $I^{-} - 332 k J m o l^{- 1}$
for $C l^{-} - 384 k J m o l^{- 1},$ for $I^{-} - 307 k J m o l^{- 1}$

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Q. The mobility of metal ions in aqueous medium

(L i^{\oplus}, N a^{\oplus}, K^{\oplus}, R b^{\oplus})

in an electric field, follows the order:

$L i^{\oplus} > N a^{\oplus} > K^{\oplus} > R b^{\oplus}$
$R b^{\oplus} > N a^{\oplus} \equiv K^{\oplus} > L i^{\oplus}$
$L i^{\oplus} < N a^{\oplus} < K^{\oplus} < R b^{\oplus}$
$N a^{\oplus} \equiv K^{\oplus} > R b^{\oplus} > L i^{\oplus}$

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Q. Number of moles of electrons in 4.2 g of

N^{3 -}

ion (nitride ion) is:

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Q. Consider the ions

F e^{2 +}, F e^{3 +}, C r^{2 +}, C r^{3 +}, M n^{2 +}, M n^{3 +}

. Strongest oxidizing ion is ?

$C r^{3 +}$
$M n^{3 +}$
$F e^{2 +}$
$M n^{2 +}$

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Q. Which of the following acts as a better metal?

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Q. Explain the reason for the fusion of an organic compound with metallic sodium for testing nitrogen. sulphur, and halogens.

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Which of the following represents increasing order of ionic conductance?

$F^{-} < C l^{-} < B r < I^{-}$
$I^{-} < B r^{-} < F^{-} < C l^{-}$
$F^{-} < C l^{-} < I^{-} < B r^{-}$
$F^{-} < I^{-} < C l^{-} < B r^{-}$

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Q. Among the following, which is a strong electrolyte?

${B r}_{2}$
$C a {C l}_{2}$
$C_{6} H_{12} O_{6}$
$H_{2} O$
${N O}_{3}$

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Q. Which one of the following ion is the smallest ion?

$O_{2}$
$O_{2}^{+}$
$O_{2}^{-}$
$O_{2}^{2 -}$

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Q. The lattice enthalpy of solid

N a C l

772 k J {m o l}^{- 1}

and enthalpy of solution is

2 k J {m o l}^{- 1}

. If the hydration enthalpy of

{N a}^{+}

and

{C l}^{-}

ions are in the ratio of

3 : 2.5

, what is the enthalpy of hydration of chloride ion?

None
$- 140 k J {m o l}^{- 1}$
$- 350 k J {m o l}^{- 1}$
$- 351.81 k J {m o l}^{- 1}$

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Q. Match the cations from List I with their properties in List II.

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Q. Assertion :The ratio of

Z n^{2 +}

and

F^{-}

per unit cell ZnS and

C a F_{2}

is 1:2. Reason: In ZnS,

Z n^{2 +}

ions occupy alternate tetrahedral voids and in

C a F_{2}, F^{-}

ions occupy all the tetrahedral voids of FCC unit cell.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Assertion is correct but Reason is incorrect
Assertion is incorrect but Reason is correct

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Q. "Li metal is used in photoelectric cells, while Cs is not used."
Answer whether the above statement is true or false.
If true enter 1, else enter 0.

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An aqueous solution of metal ion

M_{1}

reacts separately with reagents

Q

and

R

in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion

M_{2}

always forms tetrahedral complexes with these reagents. The aqueous solution of

M_{2}

on reaction with reagent

S

gives the white precipitate which dissolves in excess of

S

. The reactions are summarized in the given below. Tetrahedral

Q \leftarrow --- - e x c e s s M_{1} R - --- \to e x c e s s

Square planar

Tetrahedral

Q \leftarrow --- - e x c e s s M 2 R - --- \to e x c e s s

Tetrahedral

↓ S

, Stoichiometric amount

White precipitate

S - --- \to e x c e s s

precipitate dissolves

$4.90 B M$
$1.73 B M$
$3.87 B M$
$2.83 B M$

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State True or False.

_{3}

_{4}

is mixed oxide of FeO and Fe

_{2}

_{3}

True
False

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Statement: In

ZnS

(zinc blende) structure, the co-ordination number of each ion is

4

State whether the given statement is true or false

True
False

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How does the chemical reactivity of elements vary in a

Group

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Q. In the reaction:

N a_{2} C O_{3} S O_{2} \to A N a_{2} C O_{3} \to B E l e m e n t S - ----- \to Δ C_{2} D

find the oxidation state of S in product C ?

2
6
+5 and -1
+5 and 0

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M g^{2 +}

ion has how many number of electrons?

$12$
$14$
$10$
$24$

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