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Q1. Which one of the following was used as a chemical weapon in the First World War?
निम्नलिखित में से क्या पहले विश्व युद्ध में रासायनिक हथियार के रूप में उपयोग किया गया था?
(a) Carbon monoxide/कार्बन मोनोऑक्साइड
(b) Hydrogen cyanide/हाइड्रोजन साइनाइड
(c) Mustard gas/मस्टर्ड गैस
(d) Water gas/ जल गैस
निम्नलिखित में से क्या पहले विश्व युद्ध में रासायनिक हथियार के रूप में उपयोग किया गया था?
(a) Carbon monoxide/कार्बन मोनोऑक्साइड
(b) Hydrogen cyanide/हाइड्रोजन साइनाइड
(c) Mustard gas/मस्टर्ड गैस
(d) Water gas/ जल गैस
Ans.(c)
Sol. Mustard gas is a chemical compound which has been used as a chemical weapon in First World War. Its chemical name is ‘Dichlorodiethyl Sulphide’. It is a poisonous gas. It can cause ulcers on the skin.
Sol. Mustard gas is a chemical compound which has been used as a chemical weapon in First World War. Its chemical name is ‘Dichlorodiethyl Sulphide’. It is a poisonous gas. It can cause ulcers on the skin.
Q2. RDX was invented by
RDX का आविष्कार किसके द्वारा किया गया था?
(a) Alfred Nobel / अल्फ्रेड नोबेल
(b) Soddy / सोडी
(c) Bergillins / बर्गिलिन
(d) Henning / हेनिंग
Show Answer
Ans.(d)
Sol. RDX, the abbreviation of this word is Research Department Explosive, is also called cyclonite. It is powerful explosive discovered by Georg Friedrich Henning of Germany and patent in 1898 but not used until World War II when most of the warring powers introduced it.
Sol. RDX, the abbreviation of this word is Research Department Explosive, is also called cyclonite. It is powerful explosive discovered by Georg Friedrich Henning of Germany and patent in 1898 but not used until World War II when most of the warring powers introduced it.
Q3. The two elements that are frequently used for making transistors are
ट्रांजिस्टर बनाने के लिए अक्सर उपयोग किए जाने वाले दो तत्व हैं
(a)Boron and aluminium/ बोरान और एल्यूमीनियम
(b)Silicon and germanium/सिलिकॉन और जर्मेनियम
(c)Iridium and tungsten/इरिडियम और टंगस्टन
(d)Niobium and columbium/नाइओबियम और कोलम्बियम
Show Answer
Ans.(b)
Sol. Silicon and germanium
Sol. Silicon and germanium
Q4. Brass gets discoloured in air because of the presence of which of the following gases in air?
हवा में निम्न में से किस गैस की उपस्थिति के कारण पीतल हवा में फीका हो जाता है?
(a)Oxygen/ऑक्सीजन
(b)Hydrogen sulphide/हाइड्रोजन सल्फ़ाइड
(c)Carbon dioxide/कार्बन डाइआक्साइड
(d) Nitrogen/नाइट्रोजन
Show Answer
Ans.(b)
Sol. Because of the presence of hydrogen sulphide in Brass,it combines with oxygen in air and form water,evaporates.
Sol. Because of the presence of hydrogen sulphide in Brass,it combines with oxygen in air and form water,evaporates.
Q5. Rodenticide is the chemical which is used to control.
कृत्रिम श्वासोधक रासायनिक पदार्थ है जिसे ______ को नियंत्रित करने के लिए उपयोग किया जाता है.
(a) Bats/चमगादड़
(b) Monkeys/बंदर
(c) Mouse/चूहे
(d) Rabbits/खरगोश
Show Answer
Ans.(c)
Sol. Potassium Cyanide (KCN) or Zinc Phosphide is a highly toxic chemical used as a rodenticide – a poison to kill the mouse.
Sol. Potassium Cyanide (KCN) or Zinc Phosphide is a highly toxic chemical used as a rodenticide – a poison to kill the mouse.
Q6. Which of the following is a non metal that remains liquid at room temperature?
निम्न में से कौन सा एक गैर धातु है जो कमरे के तापमान पर तरल रहता है?
(a) Phosphorous/फ़ास्फ़रोस
(b)Bromine/ब्रोमिन
(c) Chlorine/क्लोरीन
(d) Helium/हीलियम
Show Answer
Ans.(b)
Sol. Bromine is the only non metal and Mercury only metal , liquid at room temperature.
Sol. Bromine is the only non metal and Mercury only metal , liquid at room temperature.
Q7. Isotope 14C6is associated with-
आइसोटोप 14C6 किस से संबंधित है:
(a) For cancer diagnosis/कैंसर निदान के लिए
(b) Determining the age of the earth/पृथ्वी की उम्र का निर्धारण करना
(c) Determining the age of fossil/जीवाश्म की उम्र निर्धारित करना
(d) For traler technology/ट्रेलर तकनीक के लिए
आइसोटोप 14C6 किस से संबंधित है:
(a) For cancer diagnosis/कैंसर निदान के लिए
(b) Determining the age of the earth/पृथ्वी की उम्र का निर्धारण करना
(c) Determining the age of fossil/जीवाश्म की उम्र निर्धारित करना
(d) For traler technology/ट्रेलर तकनीक के लिए
Show Answer
Ans.(c)
Sol. This theory was given by Willard Frank Libby in 1949. To determine the age of wood and bones (the time which elapsed after the death of plant) is called Ratio Carbon Dating. The Half-life of Carbon 14 is 5,730 + 40 years.
Sol. This theory was given by Willard Frank Libby in 1949. To determine the age of wood and bones (the time which elapsed after the death of plant) is called Ratio Carbon Dating. The Half-life of Carbon 14 is 5,730 + 40 years.
Q8. Which one of the following pairs is correctly matched?
निम्नलिखित में से कौन सा सुमेलित है?
(a) Silver Iodide(रजत आइडाइड) – Horn Silver(हॉर्न रजत)
(b) Silver Chloride(सिल्वर क्लोराइड) – Artificial rain(कृत्रिम बारिश)
(c) Zinc Phosphide(जस्ता फॉस्फेट) – Rat poison(चूहे मारने का ज़हर)
(d) Zinc Sulphide(जिंक सल्फाइड) – Philosopher’s wool(दार्शनिक ऊन)
निम्नलिखित में से कौन सा सुमेलित है?
(a) Silver Iodide(रजत आइडाइड) – Horn Silver(हॉर्न रजत)
(b) Silver Chloride(सिल्वर क्लोराइड) – Artificial rain(कृत्रिम बारिश)
(c) Zinc Phosphide(जस्ता फॉस्फेट) – Rat poison(चूहे मारने का ज़हर)
(d) Zinc Sulphide(जिंक सल्फाइड) – Philosopher’s wool(दार्शनिक ऊन)
Show Answer
Ans.(c)
Sol. Pairs is correctly matched as such-
Silver Iodide – Artificial rain
Silver Chloride – Horn Silver
Zinc Phosphide – Rad poison
Zinc Oxide – Philosopher’s wool
Sol. Pairs is correctly matched as such-
Silver Iodide – Artificial rain
Silver Chloride – Horn Silver
Zinc Phosphide – Rad poison
Zinc Oxide – Philosopher’s wool
Q9. The important metal used with iron to make it rust free-
लौह को जंग मुक्त करने के लिए इसके साथ उपयोग की जाने वाली महत्वपूर्ण धातु कौन सी है-
(a) Aluminium / एल्युमीनियम
(b) Carbon / कार्बन
(c) Chromium / क्रोमियम
(d) Tin / टिन
लौह को जंग मुक्त करने के लिए इसके साथ उपयोग की जाने वाली महत्वपूर्ण धातु कौन सी है-
(a) Aluminium / एल्युमीनियम
(b) Carbon / कार्बन
(c) Chromium / क्रोमियम
(d) Tin / टिन
Show Answer
Ans.(c)
Sol. Stainless steel alloy with a minimum of 10.5% Chromium content by mass. The presence of Chromium protects steel from corrosion, rust and make it high-temperature resistance.
Sol. Stainless steel alloy with a minimum of 10.5% Chromium content by mass. The presence of Chromium protects steel from corrosion, rust and make it high-temperature resistance.
Q10. Which one of the following catalysts is used in hydrogenation of vegetable oils?
वनस्पति तेलों के हाइड्रोजनीकरण के लिए निम्न में से कौन सा उत्प्रेरक उपयोग किया जाता है?
(a) Zinc / जस्ता
(b) Platinum / प्लेटिनम
(c) Nickel / निकेल
(d) Iron / लोहा
वनस्पति तेलों के हाइड्रोजनीकरण के लिए निम्न में से कौन सा उत्प्रेरक उपयोग किया जाता है?
(a) Zinc / जस्ता
(b) Platinum / प्लेटिनम
(c) Nickel / निकेल
(d) Iron / लोहा
Show Answer
Ans.(c)
Sol. During hydrogenation, the vegetable oils are reacted with hydrogen gas . A nickel catalyst is used to speed up the reaction. The double bond is converted to single bond in the reaction. In this way, the unsaturated fats can be made into saturated fats.
Sol. During hydrogenation, the vegetable oils are reacted with hydrogen gas . A nickel catalyst is used to speed up the reaction. The double bond is converted to single bond in the reaction. In this way, the unsaturated fats can be made into saturated fats.
Q11. What is the shape of Sulphur hexafluoride molecule?
सल्फर हेक्साफ्लोराइड अणु का आकार क्या है?
(a) Trigonal pyramid / त्रिकोणीय पिरामिड
(b) Octahedral / अष्टभुजाकार
(c) Planar / प्लानर
(d) Tetrahedral / चतुष्फलकीय
सल्फर हेक्साफ्लोराइड अणु का आकार क्या है?
(a) Trigonal pyramid / त्रिकोणीय पिरामिड
(b) Octahedral / अष्टभुजाकार
(c) Planar / प्लानर
(d) Tetrahedral / चतुष्फलकीय
Show Answer
Ans.(b)
Sol. Sulphur hexafluoride (SF6) is an inorganic, colourless, odourless and non-flammable compound. SF6 has an octahedral shape. It has 12 electrons around the central Sulphur atom. This means there are six electron pairs arranged in an octahedral shape.
Sol. Sulphur hexafluoride (SF6) is an inorganic, colourless, odourless and non-flammable compound. SF6 has an octahedral shape. It has 12 electrons around the central Sulphur atom. This means there are six electron pairs arranged in an octahedral shape.
Q12. Which is not a Lewis acid?
इनमें से क्या लुईस एसिड नहीं है?
(a) AlCl3
(b) BF3
(c) NH3
(d) FeCl3
इनमें से क्या लुईस एसिड नहीं है?
(a) AlCl3
(b) BF3
(c) NH3
(d) FeCl3
Show Answer
Ans.(c)
Sol. The Lewis acids are lone pair acceptors. The Lewis bases are lone pair donors. Nitrogen in NH3 has 5 electrons in which 3 of them are involved in bonding. That leaves one lone pair. This lone pair is available for bonding. Therefore, NH_3 is a Lewis base.
Sol. The Lewis acids are lone pair acceptors. The Lewis bases are lone pair donors. Nitrogen in NH3 has 5 electrons in which 3 of them are involved in bonding. That leaves one lone pair. This lone pair is available for bonding. Therefore, NH_3 is a Lewis base.
Q13. The chemical formula of baking soda is:
बेकिंग सोडा का रासायनिक सूत्र है
(a) Ca(OH)2
(b) NaHCO3
(c) CaCO3
(d) Na2CO3
Show Answer
Ans.(b)
Sol. Sodium bicarbonate is also known as Baking Soda. The chemical formula of Sodium Bicarbonate is NaHCO3.
Sol. Sodium bicarbonate is also known as Baking Soda. The chemical formula of Sodium Bicarbonate is NaHCO3.
Q14. Which one of the following pairs is not correctly matched?
निम्नलिखित में से कौन सा सुमेलित नहीं है?
(a) Dry ice(सूखी बर्फ) : Solid carbon dioxide(ठोस कार्बन डाइऑक्साइड)
(b) Mustard gas(मस्टर्ड गैस) : Poisonous liquid used in chemical warfare(रासायनिक युद्ध में उपयोग किए जाने वाले जहरीले तरल)
(c) Teflon(टेफ़लोन) : Polymer containing fluorine(पॉलिमर युक्त फ्लोरीन)
(d) Fullerene(फुलरीन) : Organic compounds containing fluorine(फ्लोरीन वाले कार्बनिक यौगिक)
निम्नलिखित में से कौन सा सुमेलित नहीं है?
(a) Dry ice(सूखी बर्फ) : Solid carbon dioxide(ठोस कार्बन डाइऑक्साइड)
(b) Mustard gas(मस्टर्ड गैस) : Poisonous liquid used in chemical warfare(रासायनिक युद्ध में उपयोग किए जाने वाले जहरीले तरल)
(c) Teflon(टेफ़लोन) : Polymer containing fluorine(पॉलिमर युक्त फ्लोरीन)
(d) Fullerene(फुलरीन) : Organic compounds containing fluorine(फ्लोरीन वाले कार्बनिक यौगिक)
Show Answer
Ans.(d)
Sol. Dry Ice – We can simply say that Dry ice is solid Carbon dioxide CO_2. It is used as a cooling agent.
Mustard gas – It is used as a strong chemical weapon. This mortally chemical affects skin, leering eye, lungs and D.N.A. which affects the cells most. After 1-6 hours the symptoms seem to be visible.
Teflon – Its commercial name is Polytetra Fluoroethylene. It has been registered in 1944. It is synthesized fluoropolymer in which fluorine atom is mixed. So Teflon is a Fluorine containing the polymer.
Fullerene – Fullerene is an allotrope of the carbon family in which fully carbon atoms are integrated. It is denoted by C_60. In 1985, at Rice University the name ‘Fullerene’ was given by St. Richard Buckminster. Fullerene is an Allotrope of Carbon.
Sol. Dry Ice – We can simply say that Dry ice is solid Carbon dioxide CO_2. It is used as a cooling agent.
Mustard gas – It is used as a strong chemical weapon. This mortally chemical affects skin, leering eye, lungs and D.N.A. which affects the cells most. After 1-6 hours the symptoms seem to be visible.
Teflon – Its commercial name is Polytetra Fluoroethylene. It has been registered in 1944. It is synthesized fluoropolymer in which fluorine atom is mixed. So Teflon is a Fluorine containing the polymer.
Fullerene – Fullerene is an allotrope of the carbon family in which fully carbon atoms are integrated. It is denoted by C_60. In 1985, at Rice University the name ‘Fullerene’ was given by St. Richard Buckminster. Fullerene is an Allotrope of Carbon.
Q15. The pH of lemon juice is expected to be—
नींबू के रस का PH कितना होने की उम्मीद है?
(a) more than 7/7 से अधिक
(b) equal to 7/7 के बराबर
(c) nothing can be predicted/कुछ भी भविष्यवाणी नहीं की जा सकती
(d) less than 7/7 से कम
नींबू के रस का PH कितना होने की उम्मीद है?
(a) more than 7/7 से अधिक
(b) equal to 7/7 के बराबर
(c) nothing can be predicted/कुछ भी भविष्यवाणी नहीं की जा सकती
(d) less than 7/7 से कम
Show Answer
Ans.(d)
Sol. Lemons are acidic. Any chemical with a pH less than 7 is considered acidic. Lemon juice has a pH around 2.0
Sol. Lemons are acidic. Any chemical with a pH less than 7 is considered acidic. Lemon juice has a pH around 2.0
