NTSE MAT Class 8 Chemistry Questions and Answers Set B

Question. If ethanol reacts with oxygen it produces
(a) Acetic Acid
(b) Hydrocloric Acid
(c) Sulphuric Acid
(d) Sulphur dioxide
Answer: (a) \( C_2H_5OH + O_2 \xrightarrow{K_2Cr_2O_7} CH_3COOH + H_2O \) Acetic Acid

Question. Fill the question mark in following reaction
\( CH_3COONa + NaOH/CaO \xrightarrow{\Delta} ? + Na_2CO_3 \)
(a) 2 C2H6
(b) CH4
(c) C2H4
(d) None of the options
Answer: (b) When Sodium acetate react with sodalime, methane is produced

Question. A burner consumes one gram of LPG in 11 sec. What is the power of consumption of burner in KW if Cv of LPG is 55 kJ/g.
(a) 5 kW
(b) 10 kW
(c) 5.5 kW
(d) None of the options
Answer: (a) Power = E / T = 55 / 11 = 5 kW, Time (T) = 1 sec.

Question. The ideal gas equation is
(a) \( P_1T_1 / V_1 = P_2V_2 / T_2 \)
(b) \( P_1V_1 / T_1 = P_2V_2 / T_2 \)
(c) \( P_1V_1T_1 = P_2V_2T_2 \)
(d) \( P_1V_1 / T_2 = P_2V_2 / T_1 \)
Answer: (b) \( P_1V_1 / T_1 = P_2V_2 / T_2 \)

Question. Dalton’s Law of partial pressure is obeyed in which one of the following pair of gases
(a) Oxygen & Nitrogen
(b) Nitrogen & Hydrogen
(c) Hydrogen & Argon
(d) Hydrogen & oxygen
Answer: (c) Hydrogen & Argon

Question. The molecular formula of a compound in \( (CO)_x \) and its vapour density is 70. Then the possible value of x is
(a) 2
(b) 10
(c) 5
(d) 9
Answer: (c) 5

Question. Number of groups present in the long form of the periodic table are
(a) 16
(b) 8
(c) 2
(d) 18
Answer: (a) 16

Question. Which of the following is a neutral oxide
(a) NO
(b) NO2
(c) N2O5
(d) CO2
Answer: (a) NO

Question. Molecular weight of a substance is equivalent to
(a) Sum of atomic wt. of each element present in the given substance
(b) Sum of At.wt of each element with their respective number present in each compound
(c) Sum of equivalent wt. of each element present in the given substance
(d) None of the options
Answer: (b) Sum of At.wt of each element with their respective number present in each compound

Question. Covalent linkages is formed by
(a) Transfer of electrons
(b) Mutual sharing of electrons
(c) Transfer as well as mutual sharing of electrons
(d) None of the options
Answer: (b) Mutual sharing of electrons

Question. If an acid having construction as 0.01 N is diluted to 1000 times then the PH of that acid is ?
(a) 5
(b) 2
(c) 3
(d) 10
Answer: (a) 5

Question. Oxygen has two isotopes \( O^{16} \) & \( O^{18} \). If the percentage of \( O^{16} \) is 90 then the atomic weight of oxygen will be
(a) 16
(b) 16.2
(c) 16.4
(d) None of the options
Answer: (b) 16.2

Question. Atom that can neither gain nor lose electrons is said to be
(a) an Inert
(b) Atomsperic
(c) Metalic
(d) Non – metalic
Answer: (a) an Inert

Question. When a burning splinter is brought near the gas jar containing hydrogen gas a poping sound is observed. It is due to
(a) exothermic
(b) endothermic
(c) exothermic & endothermic
(d) None of the options
Answer: (a) exothermic

Question. In which of the following preparation Hydrogen is not used?
(a) preparation of Ammonia (NH3)
(b) Hydrogenetion of oil
(c) Synthesis of water gas
(d) all of these
Answer: (d) all of these

Question. Deacon’s process is used for the manufacturing of
(a) Bleaching powder
(b) Sulphuric acid
(c) chlorine
(d) Hydrochloric acid (HCL)
Answer: (c) chlorine

Question. Which one of the following method is considered to be a best method for the removal of temporary hardness of water
(a) Caylon’s process
(b) Clark’s process
(c) Vesence process
(d) Permutti’s process
Answer: (b) Clark’s process

Question. When chlorine gas is passed through NaoH, it forms
(a) Sodium chloride
(b) Sodium chlorate
(c) Sodium hypochlorite
(d) All of these
Answer: (d) All of these

Question. Skin becomes yellow in Conc. \( H_2SO_4 \) as
(a) \( HNO_3 \) acts as an oxidizing agent
(b) \( HNO_3 \) acts as a dehydrating agent
(c) Nitro – cellulose is formed
(d) The proteins are converted into xantho proteins
Answer: (d) The proteins are converted into xantho proteins

Question. Which of the following is used as a moderator in nuclear reactor
(a) Water
(b) Heavy water
(c) Active Hydrogen
(d) Heavy Hydrogen
Answer: (b) Heavy water

Question. Which one of the following is known as “King of Chemicals”
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Phosphoric acid
Answer: (b) Sulphuric acid

Question. The common gas used in our refrigerator
(a) maresh gas
(b) producer gas
(c) freon
(d) water gas
Answer: (c) freon

Question. Alum is added with muddy water to
(a) Kill bactaria
(b) Make filtration of milk
(c) Make the sedimsitation process quick
(d) None of the options
Answer: (c) Make the sedimsitation process quick

Question. Alloy is a homogenous mixture of
(a) two or more metals
(b) a metal & a non metal
(c) metals as well as non metals
(d) all of these
Answer: (c) metals as well as non metals

Question. To protect the metal from corrosion it is some times coated with a thin layer of \( Al_2O_3 \) (Aluminium oxide) and the process is called
(a) Electroplating
(b) Electroforming
(c) Aluminizing
(d) None of the options
Answer: (b) Electroforming

Question. The I.U.P.A.C. name of the compound \( CH_2 CH_2 CH (CH_3)_2 \) is
(a) N – Propene
(b) 3 methyl butane
(c) 2 methyl butene
(d) None of the options
Answer: (c) 2 methyl butene

Question. Fuel in Automobiles is a mixture of
(a) saturated hydrocarbons
(b) unsaturated hydrocarbons
(c) crude oil
(d) saturated & unsaturated hydrocarbons
Answer: (c) crude oil

Question. In the soda fire extinguishes due to
(a) formation of \( CO_2 \)
(b) presence of sodium bicarbonate
(c) formation of water as a product
(d) None of the options
Answer: (a) formation of \( CO_2 \)

Question. The glasses which is used for making lenses and prisms for optical instrument
(a) Hard glass
(b) Pyrex glass
(c) Croked glass
(d) Tint glass
Answer: (c) Croked glass