Chemistry

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Showing 701 to 725 of 1398 questions (page 29 of 56).

701. The flame colour given by potassium compounds is

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

702. The chemical formula of plaster of Paris is

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

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

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

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

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

705. Boron trifluoride acts as a Lewis acid because boron

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

706. 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

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

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

708. The strongest oxidizing agent among the halogens is

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

709. Bleaching powder is prepared by passing chlorine over

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

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

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

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

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

712. 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. nuclear transitions E. hydrogen bonding

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

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

714. EDTA is an example of a

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

715. Transition metals show variable oxidation states because

A. they are all diamagnetic B. their ionization energies are very high 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

716. The hybridization of each carbon atom in ethene is

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

717. The halogenation of alkanes in sunlight proceeds by a

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

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

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

719. Benzene characteristically undergoes

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

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

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

721. A Grignard reagent has the general formula

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

722. Controlled oxidation of a primary alcohol gives

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

723. Phenol is more acidic than ethanol because

A. it has a higher molar mass B. the phenoxide ion is stabilized by resonance C. it contains a benzene ring that repels electrons D. it is a stronger nucleophile E. it is insoluble in water

724. Tollen's reagent is used to distinguish

A. alcohols from ethers B. amines from amides C. acids from esters D. alkanes from alkenes E. aldehydes from ketones

725. Carboxylic acids are more acidic than alcohols because

A. they contain two oxygen atoms of equal bond length only in the acid B. they are less soluble C. they are liquids D. the carboxylate ion is resonance stabilized E. they have a longer chain

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