UPTET 2019 | Mostly Asked Chemistry Questions | 28th December 2019_00.1
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UPTET 2019 | Mostly Asked Chemistry Questions | 28th December 2019

UPTET 2019 | Mostly Asked Chemistry Questions | 28th December 2019_40.1

UPTET 2019 Exam Important Science Questions:

Today, we are providing you the Science Questions, which help you to command over this subjects.Taught many interesting science information and add some fun in a science teaching-learning process.This section is not only important for CTET 2019 Exam i.e UPTETREETHTET etc. So, we will provide you the questions which will help you in preparing for Exam.

Q1. Which of the following are exothermic reactions?
निम्नलिखित में से क्या उष्माक्षेपी प्रतिक्रिया है?
(i) Reaction of water with quick lime/ चूने के साथ पानी की प्रतिक्रिया
(ii) Evaporation of water/ पानी का वाष्पीकरण
(iii) Dilution of an acid/ अम्ल का घोल
(iv)  Sublimation of crystals/ क्रिस्टल का उर्ध्वपातन
(a) 1 and 2 only/ केवल 1 और 2
(b) 1 and 3 only/ केवल 1 और 3
(c) 3 only/ केवल 3
(d) all of the above/ उपरोक्त सभी
Q2. Which of the following is not a physical change?
निम्नलिखित में से क्या शारीरिक परिवर्तन नहीं है?
(a) combustion of LPG/ एलपीजी का ज्वलन
(b) melting of ice to give water/ पानी के लिए बर्फ का पिघलना
(c) boiling of water to give water vapor/ पानी की भाप देने के लिए पानी को उबालना
(d) dissolution of salt in water/ पानी में नमक का विलयन
Q3. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?
अमोनियम सल्फेट के साथ प्रतिक्रिया करने पर बेरियम क्लोराइड बेरियम सल्फेट और अमोनियम क्लोराइड बनाता है. निम्नलिखित में से कौन-सा सही ढंग से शामिल प्रतिक्रिया का प्रतिनिधित्व करता है?
1. Precipitation reaction/ शीघ्र प्रतिक्रिया
2. Displacement reaction/ विस्थापन प्रतिक्रिया
3. Combination reaction/ संयोजन प्रतिक्रिया
4. Double displacement reaction/ दोहरी विस्थापन प्रतिक्रिया
(a) 2 and 3 only/ केवल 2 और 3
(b) 1 and 2 only/ केवल 1 और 2
(c) 1 and 4 only/ केवल 1 और 4
(d) 1 and 3 only/ केवल 1 और 3
Q4. Which of the following gases can be used for storage of fresh sample of oil for a long time?
निम्नलिखित में से कौन सी गैस का उपयोग लंबे समय तक एक तेल के ताजा नमूने के भंडारण के लिए किया जा सकता है?
(a) nitrogen or carbon/ नाइट्रोजन या कार्बन
(b) carbon dioxide only/ केवल कार्बन डाइऑक्साइड
(c) oxygen only/ केवल ऑक्सीजन
(d) helium or nitrogen/ हीलियम या नाइट्रोजन
Q5. Which of the following is/are an endothermic process(es) ?
निम्नलिखित में से क्या एक ऊष्माशोशी प्रक्रिया(एं) है?
1. Dilution of sulphuric acid/ सल्फ्यूरिक एसिड का घोल
2. Sublimation of dry ice/ शुष्क बर्फ का उर्ध्वपातन
3. Condensation of water vapors/ पानी की संघनन वाष्प
4. Evaporation of water/ पानी का वाष्पीकरण
(a) 1 and 3 only/ केवल
(b) 2 and 4 only/ केवल 2 और 4
(c) 1 only/ केवल 1
(d) 2 only/ केवल 2
Q6. What happens when a solution of an acid is mixed with a solution of a base in a test tube?
क्या होता है जब एक टेस्ट ट्यूब में एक अम्लीय विलयन को बेस के विलयन में मिलाया जाता है?
1. salt formation takes place/ नमक का निर्माण होता है
2. the temperature of the solution remains the same/ विलयन का तापमान समान रहता है
3  the temperature of the solution increases/ विलयन का तापमान बढ़ता है
4. the temperature of the solution decreases/ विलयन का तापमान कम हो जाता है
(a) 1 and 4/ 1 और 4
(b) 2 and 3/ 2 और 3
(c) 3 and 1/ 3 और 1
(d) 2 and 4/ 2 और 4
Q7. Which one of the following processes involves chemical reactions?
निम्नलिखित में से किस प्रक्रिया में रासायनिक प्रतिक्रियाएं शामिल हैं?
(a) liquefaction of air/ वायु का द्रवीकरण
(b) keeping petrol in a china dish in the open/ खुले में चाइना डिश में पेट्रोल रखना
(c) storing of oxygen gas under pressure in a gas cylinder/ गैस सिलेंडर में दबाव में ऑक्सीजन गैस का भंडारण
(d) heating copper wire in presence of air at high temperature/ उच्च तापमान पर हवा की उपस्थिति में तांबे के तार को गर्म करना
Q8. Which of the following salts does not contain water of crystallization?
निम्नलिखित में से किस लवण में क्रिस्टलीकरण का पानी नहीं होता है?
(a) washing soda/ कपड़े धोने का सोडा
(b) gypsum/ जिप्सम
(c) blue vitriol/ नीला विट्रियल
(d) baking soda/ बेकिंग सोडा
Q9. During the preparation of HCl gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to-
एक नम दिन पर HCl गैस बनाने के दौरान, गैस को आमतौर पर कैल्शियम क्लोराइड युक्त बचाव नली के माध्यम से पारित किया जाता है. बचाव नली में ली गई कैल्शियम क्लोराइड की भूमिका है-
(a) absorb the evolved gas/ निकलने वाली गैस को अवशोषित करे
(b) absorb moisture from the gas/ गैस से नमी को अवशोषित करे
(c) absorb Cl ions from the evolved gas/ निकलने वाली गैस से Cl आयनों को अवशोषित करे
(d) moisten the gas/ गैस को नम करें
Q10. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
एक जलीय घोल लाल लिटमस घोल को नीला कर देता है. निम्न में से किस विलयन को अतिरक्त मिलाने से इसका बदलाव उलट जाएगा?
(a) baking powder/ बेकिंग पाउडर
(b) ammonium hydroxide solution/ अमोनियम हाइड्रॉक्साइड विलयन
(c) hydrochloric acid/ हाइड्रोक्लोरिक एसिड
(d) lime/ चूना

Solution

S1.Ans. (b)
Sol. The “reaction of water” with quick lime forms calcium hydroxide and “releases a lot of heat” energy, so it is exothermic reaction. Dilution of acid by adding water to concentrated acid releases a lot of heat energy, so it is exothermic reaction.
S2.Ans. (a)
Sol. Combustion of Liquefied Petroleum Gas (LPG) is a chemical change. Because it is an irreversible reaction and new products, carbon dioxide and water vapour are formed and lot of heat is also produced during the reaction.
S3.Ans. (c)
Sol. This reaction is a double displacement reaction as well as a precipitation reaction. This is a double displacement reaction because one component of each compound has exchanged places with each other. It is also called a precipitation reaction due to the formation of white precipitate of barium sulphate. Rest other products formed are soluble in water except barium sulphate that precipitates out.
S4.Ans. (d)
Sol. Nitrogen or helium can be used for storage of fresh sample of oil for long time. Helium and Nitrogen both the gases provide inert atmosphere.
S5.Ans. (b)
Sol. Sublimation of dry ice and evaporation of water both are endothermic process and these heats (energy) from their surroundings to get sublime or evaporate.
S6.Ans. (c)
Sol. An acid reacts with a base to form salt and water. This reaction is called the neutralization reaction. Such a reaction is always exothermic in nature. Hence, the temperature of the solution increases.
S7.Ans. (b)
Sol. when petrol is kept in a china dish and in open it will evaporate and this process cannot be reversed thus has a property of chemical reaction
UPTET 2019 | Mostly Asked Chemistry Questions | 28th December 2019_50.1
S9.Ans. (b)
Sol. Calcium chloride is a good dehydrating agent so it is used to absorb moisture from the hydrogen chloride gas.
S10.Ans. (c)
Sol. The aqueous solution is a base as it turns red litmus solution blue. An acidic solution such as hydrochloric acid would reverse the change. In contrast, hydrochloric acid would turn blue litmus solution to red.Other options such as baking powder, lime and ammonium hydroxide solution are basic compounds. So, these substances would not be able to reverse the change



      UPTET 2019 | Mostly Asked Chemistry Questions | 28th December 2019_60.1UPTET 2019 | Mostly Asked Chemistry Questions | 28th December 2019_70.1UPTET 2019 | Mostly Asked Chemistry Questions | 28th December 2019_80.1

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