Chemistry

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Showing 401 to 425 of 1398 questions (page 17 of 56).

401. Ionization energy generally decreases

A. for half filled subshells B. with decreasing atomic size C. across a period D. down a group E. with increasing nuclear charge

402. Lithium shows a diagonal relationship with

A. aluminium B. sodium C. beryllium D. calcium E. magnesium

403. Hydration energy of an ion increases with

A. increasing charge density B. increasing atomic mass C. increasing ionic size D. decreasing charge density E. decreasing charge

404. The flame colour given by potassium compounds is

A. crimson B. apple green C. golden yellow D. brick red E. lilac

405. The chemical formula of plaster of Paris is

A. CaO B. Ca(OH)2 C. CaSO4.(1/2)H2O D. CaSO4.2H2O E. CaCO3

406. In the Solvay process, the raw materials used are

A. calcium chloride and ammonia only B. sodium sulphate and coke C. potassium chloride and water D. sodium chloride, limestone and ammonia E. sodium hydroxide and chlorine

407. Lime water turns milky on passing carbon dioxide because of the formation of

A. calcium carbonate B. calcium oxide C. calcium hydroxide D. carbonic acid E. calcium bicarbonate

408. Boron trifluoride acts as a Lewis acid because boron

A. forms hydrogen bonds B. is a metal C. has a lone pair D. has an incomplete octet E. is highly electronegative

409. Aluminium oxide is described as amphoteric because it reacts with

A. bases only B. both acids and bases C. neither acids nor bases D. acids only E. water only

410. The reluctance of the ns2 electrons to take part in bonding in heavier p-block elements is called

A. hyperconjugation B. the diagonal relationship C. the inert pair effect D. the shielding effect E. the lanthanide contraction

411. The strongest oxidizing agent among the halogens is

A. astatine B. iodine C. chlorine D. bromine E. fluorine

412. Bleaching powder is prepared by passing chlorine over

A. dry slaked lime B. sodium hydroxide solution C. calcium sulphate D. quicklime E. limestone

413. Which oxide of nitrogen is known as laughing gas?

A. N2O5 B. N2O C. N2O3 D. NO E. NO2

414. A transition element is one that has a partially filled

A. s subshell B. f subshell C. d subshell D. p subshell E. valence shell of eight electrons

415. The colour of most transition metal ions in solution is due to

A. d to d electronic transitions B. ionic size C. s to p transitions D. hydrogen bonding E. nuclear transitions

416. In the complex ion hexaamminecobalt(III), the coordination number of cobalt is

A. 2 B. 5 C. 4 D. 3 E. 6

417. EDTA is an example of a

A. monodentate ligand B. bidentate ligand C. hexadentate chelating ligand D. neutral molecule that cannot coordinate E. cation

418. Transition metals show variable oxidation states because

A. their ionization energies are very high B. they are all diamagnetic C. their atomic radii are large D. the energies of the ns and (n-1)d electrons are close E. they form only ionic compounds

419. The hybridization of each carbon atom in ethene is

A. sp3d B. sp2 C. sp3 D. sp3d2 E. sp

420. The halogenation of alkanes in sunlight proceeds by a

A. free radical substitution mechanism B. nucleophilic substitution mechanism C. electrophilic addition mechanism D. rearrangement E. elimination mechanism

421. According to Markownikoff's rule, addition of hydrogen bromide to propene gives mainly

A. 1,2-dibromopropane B. 1-bromopropane C. propane D. propan-1-ol E. 2-bromopropane

422. Benzene characteristically undergoes

A. elimination B. electrophilic addition C. electrophilic substitution D. nucleophilic addition E. free radical addition

423. A primary alkyl halide reacting with a strong nucleophile typically follows

A. E1 elimination B. electrophilic addition C. free radical substitution D. the SN2 mechanism E. the SN1 mechanism

424. A Grignard reagent has the general formula

A. RMgX B. RZnX C. RLiX D. RNaX E. RAlX

425. Controlled oxidation of a primary alcohol gives

A. an ester B. a ketone C. an alkane D. an ether E. an aldehyde

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