Recent questions and answers in Chemistry

The molecular geometry of SF6 is octahedral. What is the geometry of SF4 (including lone pair(s) of electrons, if (any)? (1) Square planar (2) Trigonal bipyramidal (3) Tetrahedral (4) Pyramidal

Mass of Li3+ is 8.33 times mass of proton Li3+ and proton are accelerated through same potential difference. Then ratio of Debroglie's wavelength of Li3+ to proton is x × 10–1. Find x Numerical Value Type

4.5 gm of solute having molar mass of 90 gm/mol is dissolved in water to make 250 ml solution. Calculate molarity of the solution Numerical Value Type

Among the following compounds how many are amphoteric in nature Be(OH)2, BeO, Ba(OH)2, Sr(OH)2 Numerical Value Type

What is the coordination number in Body centred cubic (BCC) arrangement of identical particles Numerical Value Type

Composition of gun metal is (1) Cu, Zn, Sn (2) Al, Mg, Mn, Cu (3) Cu, Ni, Fe (4) Cu, Sn, Fe

(1) $\require{mhchem}\ce{I2 +H2O2 +2OH- -> 2I- +2H2O +O2}$ (2) $\ce{H2O2 +HOCl->Cl- +H3O+ +O2}$ (1) H2O2 is acting as oxidising agent in both the reaction (2) H2O2 is acting as reducing agent in both the reaction (3) H2O2 is acting as oxidising agent in ...

S-1: Colourless cupric metaborate is converted into cuprous metaborate in luminous flame. S-2: Cuprous metaborate is formed by reacting copper sulphate with boric anhydride heated in non luminous flame. (1) S1 is true and S2 is false (2) S1 is false and S2 ...

Which of the following ores are concentrated by cyanide of group Ist element. (1) Sphalerite (2) Malachite (3) Calamine (4) Siderite

Which of the following have both the compound isostructural. (A) TiCl4, SiCl4 (B) SO42-, CrO42- (C) NH3, NO3– (D) ClF3, BCl3 (1) A,B (2) A,C (3) B,C (4) A,D

The gas evolved due to anaerobic degradation of vegetation causes? (1) Global warming and caner (2) Acid rain (3) Ozone hole (4) Metal corrosion

Which force is responsible for the stacking of $\alpha$-helix structure of protein? (1) H-bonding (2) Ionic bonding (3) Covalent bond (4) Vander Wal forces

The mass of gas adsorbed, x, per unit mass of adsorbate, m, was measured at various pressures, p. A graph between $\log{x\over m}$ and $\log p$ gives a straight line with slope equal to 2 and the intercept equal to 0.4771. The value of $x\over m$ at a ...

Consider the following reactions : (i) Glucose + ROH $\require{mhchem}\ce{->[\text{dry }HCl]}$ Acetal $\ce{->[\text{x eq. of}][\ce{(CH3CO)2O}]}$ acetyl derivative (ii) Glucose $\ce{->[\ce{Ni/H2}]}$ A $\ce{->[\text{y eq. of}][\ce{(CH3CO)2O}]}$ acetyl ...

In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound ? (1) H3C–Br (2) H3C–CH2–Br (3) (4)

The major aromatic product C in the following reaction sequence will be :

For the disproportionation reaction 2Cu+(aq) $\rightleftharpoons$ Cu(s) + Cu2+(aq) at 298 K, In K (where K is the equilibrium constant) is________ 10-1. Given $\left(E_{Cu^{2+}/Cu^+}^o=0.16V,\ E_{Cu^+/Cu}^o=0.52V,\ {RT\over F}=0.025\right)$ Numerical ...

Simplified absorption spectra of three complexes ((i) and (ii) and (iii)) of M+n ion are provided below; their λmax values are marked as A, B and C respectively. The correct match between the complexes and their λmax values is: (i) [M(NCS)6](-6 + n) (ii) [...

The correct observation in the following reaction is: $\require{mhchem}\ce{Sucrose->[\text{Gly cosidic bond}][\text{Cleavage (Hydrolysis)}]A + B->[\text{Seliw anoff}][\text{Reagent}]?}$ (1) Formation of blue colour (2) Formation of violet colour (3) ...

Arrange the following labelled hydrogens in decreasing order of acidity: (1) b > c > d > a (2) c > b > a > d (3) b > a > c > d (4) c > b > d > a

Consider the reaction sequence given below : Which of the following statements is true: (1) Changing the concentration of base will have no effect on reaction (1) (2) Doubling the concentration of base will double the rate of both the reactions (3) Changing...

The major product of the following reaction is:

The results given in the below table were obtained during kinetic studies of the following reaction : 2A + B → C + D Experiment [A] / molL-1 [B] / molL-1 Initial rate / molL-1 min-1 I 0.1 0.1 6.00 10-3 II 0.1 0.2 2.40 10-2 III 0.2 0.1 1.20 10-2 IV X 0.2 7....

The major product obtained from E2-elimination of 3-bromo-2-fluoropentane is

Match the type of interaction in column A with the distance dependence of their interaction energy in column B : A B (i) ion - ion (a) $1\over r$ (ii) Dipole - dipole (b) $1\over r^2$ (iii) Londondispersion (c) $1\over r^3$ (d) $1\over r^6$ (1) (i) - (a); (...

Two compounds A and B with same molecular formula (C3H6O) undergo Grignard reaction with methylmagnesium bromide to give products C and D. Products C and D show following chemical tests. Test C D Ceric ammonium nitrate Test Positive Positive Lucas Test ...

An organic compound 'A' (C9H10O) when treated with conc. HI undergoes cleavage to yield compound 'B' and 'C'. 'B' gives yellow precipitate with AgNO3 where as 'C' tautomerizes to 'D'. 'D' gives positive iodoform test. 'A' could be:

How many (i) sp2 hybridised carbon atoms and (ii) π bonds are present in the following compound? (1) 8, 5 (2) 7, 5 (3) 8, 6 (4) 7, 6

Isotonic solutions have same (1) Boiling temperature (2) Vapour pressure (3) Freezing temperature (4) Osmotic pressure

$\require{mhchem}\ce{CH3CH2CH=CH2->[\ce{B2H6}][\ce{H2O,H2O2,OH-}]Z}.$ What is Z? (1) $\ce{CH3CH2CH2CH3}$ (2) $\ce{CH3CH2CH2CH2OH}$ (3) $\begin{array}{c}\ce{CH3CH2CHCH3}\\\quad|\\\quad\ \ \ \ce{OH}\end{array}$ (4) $\ce{CH3CH2CH2CHO}$