List of practice Questions

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 ν2 of 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 5th 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
PN2O5 (i)N–N bond
QN2O(ii)N–O–N bond
RN2O4 (iii)N=N / N≡N bond
SNO2(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 IColumn II
(i)Vitamin AaBeri-beri
(ii)Vitamin C (Ascorbic acid)bCheilosis
(iii)RiboflavincXerophthalmia
(iv)ThiaminedScurvy

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 + EthanolaPepsin
(ii)Sucrose→Glucose + Fructose bDiastase
(iii)Starch →Maltose cZymase
(iv)Protein→Amino acids dInvertase

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

Match the following with the correct name of reaction

ReactionName of reaction
(I)
(P)Gattermann Koch reaction
(II)
(Q)Hell Volhard Zelinsky
(III)
(R)Iodoform reaction

Product (P) and (Q) are respectively
The number of ways to distribute 20 chocolates among three students such that each student gets atleast one chocolate is

If 2nC3 : nC3 = 10, then \(\frac{n^{2}+3n}{n^{2}-3n+4}\) is equal to