In radiotherapy for treatment of cancer

Chemistry - Pblock Elements Xii - Quiz-7

The gas used in the gas thermometer is-

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He
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$O_{2}$
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Xe
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Ne

Welding of magnesium can be done in an atmosphere of-

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$O_{2}$
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Ar
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$N_{2}$
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All of the above

The liquid among the following that can climb up the wall of the glass vessel is -

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Alcohol
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Liquid He
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Liquid $N_{2}$
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Water

The molecular shape of ${SF}_{4}, {CF}_{4} and {XeF}_{4}$ are:

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The same with 2, 0 and 1 lone pairs of electrons on the central atoms respectively
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The same with 1, 1 and 1 lone pairs of electrons on the central atoms respectively
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Different with 0, 1 and 2 lone pairs of electrons on the central atoms, respectively
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Different with 1, 0 and 2 lone pairs of electrons on the central atoms, respectively

Argon is used in -

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To obtain low temperature
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In high-temperature welding
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In radiotherapy for treatment of cancer
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In filling airships

Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is:

$X e F_{6} \overset{C o m p l e t e H y d r o l y s i s}{\to} P + o t h e r p r o d u c t P \overset{O H^{-} / H_{2} O}{\to} Q \overset{S l o w d i s p r o p o r t i o n a t i o n i n O H^{-} / H_{2} O}{\to} P r o d u c t$

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0
0%

1
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2
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3

Among chalcogen, the highest tendency to form $X^{- 2} (g)$ ion is exhibited by

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Oxygen
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Sulphur
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Tellurium
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Selenium

Which one of the following is not a pseudo halide?

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CNO^-
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RCOO^-
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OCN^-
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$N_{3}^{-}$

Hypo on treatment with l₂ gives-

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Na₂SO₄
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Na₂S₄O₆
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Na₂SO₃
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Na₂S

Among the following reactions, in which of the following, a blue complex will be formed when starch solution is added?

(A) When chlorine is passed through NaI

(B) Sodium iodate is treated with sodium bisulphite solution

(D) KI is added to bleaching powder containing dilute acetic acid

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A, C
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A, D,
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B, C, D
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A,B,C,D

Decreasing order of reducing power hydrogen halides is:

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HI > HBr > HCl > HF
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HF > HI > HBr > HCl
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HI > HF > HBr > HCl
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None of the above

Which is a bad conductor of electricity?

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$H_{2} F_{2}$
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HCl
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HBr
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HI

HBr and HI reduce sulphuric acid; HCl can reduce $K M n O_{4}$ and HF reduces:

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$H_{2} S O_{4}$
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$K M n O_{4}$
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$K_{2} C r_{2} O_{7}$
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none

The hydrogen fluoride is liquid, unlike the other hydrogen halides, because:

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fluorine is a smaller atom
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HF is the weakest acid
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HF molecules are associated due to hydrogen bonding
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$F_{2}$ is highly reactive

The correct order of the thermal stability of hydrogen halide (H-X) is:

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HI > HBr > HCl > HF
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HF > HCl > HBr > HI
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HCl < HF > HBr < HI
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HI > HCl < HF > HBr

One can draw the map of a building on a glass plate by:

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HI
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HF
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HBr
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HCl

Which acid can combine with its own salt again?

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HF
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HBr
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HCl
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HI

Hydrofluoric acid is not preserved in glass bottles because:

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It reacts with the visible part of light
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It reacts with the sodium oxide of the glass composition
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It reacts with the aluminium oxide of the glass composition
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It reacts with the silicon dioxide of glass

Pure HF does not attack:

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Glass
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Fe
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$S i O_{2}$
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Polythene

Which of the following halogen acids has the lowest boiling point?

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HF
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HCl
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HBr
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HI

Spirit of salt is:

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HBr
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HCl
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$H_{2} S O_{4}$
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HI

Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. This is due to:

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strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke
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due to strong affinity for water, conc. HCl pulls moisture of air towards self. The moisture forms droplets of water and hence the cloud.
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Conc. HCl emits strongly smelling HCl gas all the time
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Oxygen in air reacts with mitted HCl gas to form a cloud of $C l_{2}$ gas

Consider the following reactions:

(A) $C l_{2}$ reacts with an aqueous $N a_{2} S O_{3}$ solution

(B) $C l_{2}$ is passed through suspension of iodine

(D) $C l_{2}$ is passed through an aqueous $S O_{2}$ solution

Select the reactions in which HCl is produced

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A, B, C, D
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A, B, D
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B, D
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all of these

Pure HBr may be obtained by heating sodium bromide with syrupy phosphoric acid and not with concentrated sulphuric acid because concentrated sulphuric acid is:

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more volatile
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less stable
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a weaker acid
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an oxidising agent

HI reacts with $H N O_{3}$ to form:

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$O_{2}$
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$N_{2} O$
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$H I O_{3}$
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$N O_{2} + I_{2}$

Which of the following halogen oxides is ionic?

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$I_{4} O_{9}$
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$I_{2} O_{5}$
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$B r O_{2}$
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$C l O_{3}$

Among halogens maximum oxides are formed by:

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fluorine
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chlorine
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bromine
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iodine

Which is the true covalent oxide of iodine?

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$I_{2} O_{4}$
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$I_{2} O_{5}$
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$I_{2} O_{8}$
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$I_{4} O_{9}$

$C l_{2} O$ is an anhydride of:

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$H C l O_{4}$
0%

HOCl
0%

$C l_{2} O_{3}$
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$H C l O_{2}$

Which of the following interhalogen anions is linear?

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$I_{3}^{-}$
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$I C l_{2}^{-}$
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Both (a) and (b)
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none of these

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Practice Chemistry Quiz Questions and Answers

0:0:1

Practice Chemistry Quiz Questions and Answers

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