SOME BASIC CONCEPTS OF CHEMISTRY Quiz-40

Some basic concepts of chemistry Quiz-40

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IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1.In a reaction, 4 mol of electrons are transferred to 1 mol of HNO_3.The possible product obtained due to reduction is

•  0.5 mol of N_2
•  0.5 mol of N_2 O
•  1 mol of NO_2
•  1 mol of NH_3

Solution

Q2.H_3 PO_4 (d=1.8 g/mL) is 18 M. Hence, mass percentage and molality are

•  18, 32.4
•  98, 32.4
•  98, 500
•  98, 18

Solution

Q3. ‘X’ is a colourless salt giving following reaction

•  AlCl_3
•  ZnCl_2
•  Zn(CH_3 COO)_2
•  ZnBr_2

Solution

Q4. 4 mol of a solution containing A^(n+) requires 1.6 mol of MnO_4^( ⊖) for the oxidation of A^(n+) to A〖O_3〗^⊝is acidic medium. The value ofn is

•  1
•  2
•  3
•  4

Solution

Q5. A bag contains 0.32 g of oxygen. The same volume of an unknown gas A under similar conditions of temperature and pressure weight 0.26 g. The gas A is known to contain only C and H in 1:1 ratio. The molecular formula of the compound is

•  C_2 H_2
•  C_4 H_4
•  C_3 H_4
•  CH

Solution
 

Q6. Fe(OH)_3 and Cr(OH)_3 ppt are separated by

•  aq NH_3
•  HCl
• NaOH/H_2 O_2
•  H_2 SO_4

Solution

Q7. For complete reaction inwhich reactant is further required?

•  1 mol Ba(NO_3 )_2
•  1 mol Na_3 PO_4
•  2 mol Ba(NO_3 )_2
•  2 mol Na_3 PO_4

Solution

Q8. 10 L of hard water with temporary hardness [of Ca(HCO_3 )_2 ] required 0.56 g of limeTemporary hardness in terms of ppm of CaCO_3 is

•  56
•  1/2
•  100
•  200

Solution

Q9. Atoms of the element X are spherical. Each atom of the element (atomic mass 23) is at the corner of the cube and is in contact along the edge length, then edge length is (density =6.2 g cm^(-3))

•  2.274 Å
•  1.137 Å
•  4.548 Å
•  1.183 Å

Solution

Q10. When 0.273 g of Mg is heated strongly in a nitrogen (N_2 ) atmosphere, 0.378 g of the compound is formed. Hence, compound formed is

•  Mg_3 N_2
•  Mg_3 N
•  Mg_2 N_3
• MgN

Solution