List of top Chemistry Questions

Which of the following is not correct about Grignard reagent?

Catechol and m-cresol respectively are

Hybridization of positively charged and negatively charged carbons of the following respectively are

Which of the following is the geminal dichloride?

Food preservative sodium benzoate is eliminated from the body as which of the following metabolite?

The formula of tris (ethane -1,2- diamine) cobalt (III) sulphate is:

X + Y \( \rightarrow \) oleum The sum of oxidation states of central atom in X and Y is

Identify the condensation polymers from the following
A. PHBV
B. Buna-N
C. Neoprene
D. Nylon-6
E. Glyptal

Consider the reactions
I. \( CO + 3H_2 \xrightarrow{A} CH_4 + H_2O \)
II. \( CO + 2H_2 \xrightarrow{B} CH_3OH \)
III. \( O_2 + 2H_2 \xrightarrow{C} 2H_2O \) The catalysts A, B, C are respectively

What is the osmotic pressure (in atm) of 0.02M aqueous glucose solution at 300 K? (R=0.082 L atm mol\(^{-1} \)K\(^{-1} \))

The elevation in the boiling point of aqueous urea solution is 0.104 K. What is its \( \Delta T_f \) (in K) value? (for Water \( K_b = 0.52 \) K kg mol\(^{-1} \), \( K_f = 1.86 \) K kg mol\(^{-1} \))

Which of the following is an example of a multi molecular colloid?

The correct statements regarding froth floatation method in metallurgy are
I. Used for the purification of sulphide ores
II. Used for the roasting of sulphide ores
III. It is based on the relative densities of gangue and ore particles
IV. It is based on the wetting properties of gangue and ore particles in frothing agent and water

White metal is an alloy of

Which of the following statements are not correct?
i. Atomic radius of Ga is less than that of Al
ii. The order of ionization enthalpy of group 13 elements is B>Al>Ga>In>Tl
iii. Boron trioxide is amphoteric in nature

In the above reaction electrophile is substituted at meta position only, due to

I. Electron density is more at ortho & para position
II. Electron density is relatively less at ortho & para position
III. Electron density is less at meta position
IV. Electron density is relatively more at meta position Correct answer is

Among the following the correct statements are
I. LiH, BeH\( _2 \) and MgH\( _2 \) are saline hydrides with significant covalent character
II. Saline hydrides are volatile
III. Electron - precise hydrides are Lewis bases
IV. The formula for chromium hydride is CrH The correct option is

Identify the correct statements from the following.
i. Melting points and boiling points of group 15 elements are much higher than those of corresponding group 14 elements
ii. SiO only exists at high temperatures
iii. PbI\( _4 \) does not exist
iv. Buckminster fullerene contain twelve 6-membered carbon rings and twenty 5 - membered carbon rings.

IUPAC name of the following molecule is

When 'X' g of graphite is completely burnt in a bomb calorimeter in excess of \( O_2 \) at 298 K and 1 atm pressure as given in the equation $$ \text{C(graphite)} + O_2(g) \rightarrow CO_2(g) $$ The temperature of calorimeter raised from 298 K to 302 K. If the heat capacity of the calorimeter and molar enthalpy change for the reaction at 1 atm and 298 K are 20.7 kJ K\(^{-1} \) and -248.4 kJ mol\(^{-1} \), 'X' in g is

At a given temperature, the density of an ideal gas is proportional to (P = pressure of ideal gas)

Which of the following electronic transitions in hydrogen atom will require the highest energy?

Correct order of basic strength of metallic hydroxides

Which of the following fluorides of Xenon does not exist?

Which of the following oxides is highly basic?