NEET 2015 Chemistry

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (At.Wt.of Mg =24)

2,3-Dimethyl 1-2-butene can be prepared by heating which of the following compounds with a strong acid

In the reaction with HCl, an alkene reacts in accordance with the Markovnikov’s rule to give a product 1-chloro-1-methylcyclohexane. The possible alkene is

The correct statement regarding defects in crystalline solids is

The hybridization involved in complex [Ni(CN)₄]²⁻ is (At.No.Ni = 28)

The number of structural isomers possible from the molecular formula C₆H₉N is

Which of the following is not the product of dehydration of

Which of the following reaction(s) can be used for the preparation of alkyl halides?
anh.ZnCl₂
(I)CH₃CH₂OH + HCl →
(II)CH₃CH₂OH + HCl →
(III)(CH₃)₃COH + HCl →
(IV)(CH₃)₂CHOH + HCl →

Which one of the following esters gets hydrolysed most easily under alkaline conditions

A mixture of gases contains H₂ and O₂ gases in the ratio of 1:4(w/w).What is the molar ratio of the two gases in the mixture

The species Ar,K⁺ and Ca²⁺ contain the same number of electrons.In which order do their radii increase

The correct bond order in the following species is

Which of the following pairs of ions are isoelectronic and isostructural

Maximum bond angle at nitrogen is present in which of the following

Which of the following species contains equal number of σ- and π-bonds

The K(sp) of Ag₂CrO₄, AgCl,AgBr and AgI are respectively. 1.1 ˣ 10⁻¹²,1.8 ˣ 10⁻¹⁰, 5.0 ˣ 10⁻¹³,8.3 ˣ 10⁻¹⁷.Which one of the following salts will precipitate last if AgNO₃ solution is added to the solution containing equal moles of NaCl,NaBr,NaI and Na₂CrO₄.

If the value of an equilibrium constant for a particular reaction is 1.6 ˣ 10¹², then at equilibrium the system will contains

Solubility of the alkaline earth’s metal sulphates in water decreases in the sequence

The function of ”Sodium pump” is a biological process operating in each and every cell of all animals.Which of the following biologically important ions is also a constituent of this pump:

In Duma’s method for estimation of nitrogen, 0.25 g of an organic compound gave 40 ml of nitrogen collected at 300 K temperature and 725 mm pressure.If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is

A given metal crystallizes out with a cubic structure having edge length of 361 pm.If there are four metal atoms in one unit cell ,what is the radius of one atom

Which one of the following electrolytes has the same value of van’t Hoff’s factor(i) as that of the Al₂(SO₄)₃ (if all are 100% ionised)

The boiling point of 0.2 mol kg⁻¹ solution of X in water is greater than equimolal solution of Y in water.Which one of the following statements is true in this case

Which one is not equal to zero for an ideal solution

A device that converts energy of combustion of fuels like hydrogen and methane,directly into electrical energy is known as:

The activation energy of a reaction can be determined from the slope of which of the following graphs

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected.The order of the reaction is

‘Metals are usually not found as nitrates in their ores”. Out of the following two (i) and (ii) reasons which is true for the above observation.(i)Metal nitrates are highly unstable.(ii)Metal nitrates are highly soluble in water.

Nitrogen dioxide and sulphur dioxide have some properties in common.Which property is shown by one of these compounds, but not by the other

The number of d-electrons in Fe²⁺(Z=26) is not equal to the number of electrons in which one of the following

Which of the following processes does not involve oxidation of iron

Because of lanthanoid contraction,which of the following pairs of elements have nearly same atomic radii?(Numbers in the parenthesis are atomic numbers)

The angular momentum of electron in ‘d’ orbital is equal to

Cobalt(III) chloride forms several octahedral complexes with ammonia. which of the following will not give test of chloride ions with silver nitrate at 25⁰C

Which of these statements about [CO(CN)₆]³⁻ is true

An organic compound ‘X’ having molecular formula C₅H₁₀O yields phenyl hydrozone and gives negative response to the Iodoform test and Tollen’s test.It produces n-pentane on reduction.’X’ could be

Treatment of cyclopentanone with methyl lithium gives which of the following species

The electrolytic reduction of nitrobenzene in strongly acidic medium produces

Biodegradable polymer which can be produced from glycine and aminocapronic acid is

Bithional is generally added to the soaps as an additive to function as a