List of practice Questions

In which of the following pairs of elements electron gain enthalpy difference is highest?

Two identical current carrying coils with same centre are placed with their planes perpendicular to each other. If i = \(\sqrt{2}A\) and radius of coil R = 1 m, then magnetic field at centre C is equal to:

A binary compound has Y-atoms forming FCC unit cell and another type of X-atoms occupying \(\frac{1}{3}\)^rd of tetrahedral voids. Find out the molecular formula of the compound

Which logic gate is specified by given circuit

The value of \(log_{10}K\) for a reaction A ⇋ B is

(Given,

\(\Delta H^{\circ}_{298K}\) = –54.67 kJ \(mol^{-1}\)

\(\Delta H^{\circ}_{298K}\) = 10 kJ \(mol^{-1}\)

and R = 8.314 J \(K^{-1}mol^{-1}\)

2.303 × 8.314 × 298 = 5705)

A sphere of density ρ & mass m is moving down with constant velocity in viscous liquid of density ρ₀. Find out viscous force on sphere

A monochromatic light wave with wavelength λ₁ and frequency ν₁, in air, enters another medium. If the angle of incidence and angle of refraction at the interface are 45° and 30° respectively, then the wavelength λ₂ and frequency ν₂of the refracted wave are:

A wire of length 2 m, radius of cross-section 20 mm and Young's Modulus 2×10¹¹ N/m is subjected to a force of 62.8 kN.The change in length of the wire is p×10^–5 (in m). Find P.

In a thermodynamic process work done by gas is 1000 J & heat supplied is 200 J. Find change in internal energy of gas?

A particle moves in a circular path with uniform speed v. When it turns by 90°, find ratio of \(\frac{v}{<\overrightarrow{v}>}\)?

Find out 5^th orbit radius (in pm) of Li⁺⁺ if ground orbit radius of H-atom is 51 pm.

Determine the amount of urea (NH₂CONH₂) to be added in 1000 g of water to decrease its vapour pressure by 25%.

Which of the following slows down the process of setting of the cement?

Number of ambidentate ligands in given complex [M_(en)(SCN)₄]:

2[Au(CN)₂]^– + Zn \(\to\) [Zn(CN)₄]^2– + 2Au\(\downarrow\) is which of these
(A) Redox reaction
(B) Displacement reaction
(C) Combination reaction
(D) Decomposition reaction

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
A ⇒ Spin only magnetic moment of [Fe(CN)₆]^–3 is 1.73 B.M. and [Fe(H₂O)₆]⁺³ is 5.92 B.M.
R ⇒ In both cases Fe have +3 oxidation state
In the light of the above statements, write the detailed answer:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Radius of H⁺ is 1.5 × 10^–3 pm
Reason (R) : H⁺ cannot exist independently
In the light of the above statements, write the detailed answer:

Oxidation number of Mo in Ammonophosphomolybdate

Which of following are reducing and oxidising agent respectively.

Match the terms in Column-I with their description in Column-II:

Column-I		Column-II
P	N₂O₅	(i)	N–N bond
Q	N₂O	(ii)	N–O–N bond
R	N₂O₄	(iii)	N=N / N≡N bond
S	NO₂	(iv)	N=O bond

Choose the correct option.

Match the terms in Column-I with their description in Column-II and choose the correct option :

Column I		Column II
(i)	Vitamin A	a	Beri-beri
(ii)	Vitamin C (Ascorbic acid)	b	Cheilosis
(iii)	Riboflavin	c	Xerophthalmia
(iv)	Thiamine	d	Scurvy

Photochemical smog found mainly in

Match the terms in Column-I with their description in Column-II and choose the correct option:

Column I (Chemical reactions)		Column II (Enzymes used)
(i)	Glucose → CO₂+ Ethanol	a	Pepsin
(ii)	Sucrose→Glucose + Fructose	b	Diastase
(iii)	Starch →Maltose	c	Zymase
(iv)	Protein→Amino acids	d	Invertase

How many bromo products are formed when ethane is reacted with excess of Br₂ on heating?