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• Sodium sulphate + Barium chloride → Barium sulphate + Sodium chloride
• It is a precipitation reaction.
• Since barium sulphate is insoluble in water, it precipitates as a solid while sodium chloride remains in the solution.
• A precipitation reaction is that which forms an insoluble salt when 2 solution having soluble salts are combined.

सही उत्तर है- हाथी बहुत मोटी है।

Key Points

• इस वाक्य में लिंग सम्बन्धी अशुद्धि है।
• शुद्ध वाक्य: हाथी बहुत मोटा है।

 Important Pointsलिंग क्या है?

• संज्ञा के जिस रूप से व्यक्ति या वस्तु के नर या मादा होने का ज्ञान होता है, उसे लिंग कहते हैं।
• हिन्दी में लिंग के दो प्रकार हैं:
• पुल्लिंग: जिन शब्दों से पुरुष जाति का बोध हो उसे पुल्लिंग कहते हैं।
• जैसे: आदमी, हाथी, घोडा, पंखा, इत्यादि।
• स्त्रीलिंग: जिन शब्दों से स्त्री जाति का बोध हो उसे स्त्रीलिंग कहते हैं।
• जैसे: औरत, धरती, नदी, हथिनी, घोड़ी, इत्यादि।

Additional Information 

The correct answer is 'DACB'.

Key Points

• The given question is an example of a Para Jumble.
• We know that the first statement of a para jumbled question is usually an independent general statement, a noun, a universal fact, etc.
• Sentence D will be the first sentence because it is an introductory sentence and independent of all the other sentences.
• Sentence A will be the next sentence because 'credited with saying' is directly connected with the first sentence.
• Sentence C will be the next sentence because it tells the 'action' connect with the previous one.
• Lastly, Sentence B will be used.

Correct Sentence: Dr. APJ Abdul Kalam, former President of India is credited with saying If you want to leave your footprint on the sands of time, do not dry your feet.

Given :

A = xy3z2 and B = x3y²,

for x, y, and z to be prime numbers.

Calculation :

H.C.F. (xy³z² , x³y²) = xy²(yz² , x²)

So,

H.C.F is xy² as it is the highest common factor between the two variables

∴ The answer is xy².

The correct answer is all of the above.

Important Points

• Boiling:
• It is the rapid vaporization of a liquid.
• When raw vegetables are immersed in boiling water, vegetables start to get cooked.
• The boiling point is the temperature at which the vapor pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.
• Stewing: It is a cooking method. It uses small, uniform pieces of raw food immersed in a liquid and slowly simmered. It involves a very slow boiling of water.
• Simmering: It is a cooking method in which foods are cooked in hot liquids kept just below the boiling point of water.

Thus, we can say that Water is used as a medium of cooking in boiling, stewing, and simmering.

The correct answer is option 1) i.e. Son.

• The Son River or Son of central India is the largest of the Ganga's southern tributaries and it originates near Amarkantak in Madhya Pradesh.
• The Son originates just east of the headwaters of the Narmada river and flows north-northwest through Madhya Pradesh state before turning sharply eastward where it encounters the southwest-northeast-running Kaimur Range.
• The Son flows parallel to the Kaimur hills, flowing east-northeast through Uttar Pradesh, Jharkhand, and Bihar to join the Ganga just above Patna.
• Geologically, the lower valley of the Son is an extension of the Narmada Valley, Kaimur Range, and the Vindhyan Range.
• Dehri is a major town situated on the Son river.

दिए विकल्पों में से विकल्प 2 "जिस दफ़्तर में तुम नौकरी करते हो, वहाँ मेरा एक दोस्त मैनेजर है।" सही है। अन्य विकल्प सही नहीं है। 

Key Points

स्पष्टीकरण:- 

• विकल्प 2 में जिस दफ़्तर में तुम नौकरी करते हो और मेरा एक दोस्त मैनेजर है को जोड़ने के लिए वहाँ का प्रयोग हुआ है, अतः विकल्प 2 दिए गए वाक्य का मिश्र वाक्य है।
• ऐसे वाक्य जिनमें सरल वाक्य के साथ-साथ कोई दूसरा उपवाक्य भी हो, वे वाक्य मिश्र वाक्य कहलाते हैं।
• ‘जब’; ‘तब’; ‘जहाँ’; ‘वहाँ’; ‘जिधर’; ‘उधर’ आदि का प्रयोग करके  सरल वाक्य और आश्रित वाक्य  को जोड़ा जाता है।

Additional Information

• वाक्य:- सार्थक शब्दों का समूह
• पूर्ण रूप से अपने विचारों को व्यक्त करने वाले शब्द या पद समूह को वाक्य कहते हैं।

The correct answer is "Monarchy".

Key Points

• In the given options, "Monarchy" can be be used as a one-word substitute for the given words.
• The term 'Monarchy' refers to the system of government or rule by a king or queen. (राजा या रानी द्वारा सरकार या शासन की व्यवस्था)
• Thus, option 1) is the correct alternative.

Additional Information 

• Let us understand the meaning of other options too.
• Capitalism: an economic and political system in which a country's trade and industry are controlled by private owners for profit. (पूंजीवाद)
• Example: His main contention is that capitalism is doomed to fail.
• Plutocracy: government by the wealthy. (अमीरों की सरकार)
• Example: You might mistakenly believe that our country is a plutocracy rather than a democracy based on the way the government indulges the wealthy.
• Oligarchy: Control over a nation or organization by a small group of people. (लोगों के एक छोटे समूह द्वारा किसी राष्ट्र या संगठन पर नियंत्रण)
• Example: All major choices are made by the company's oligarchy, which consists of the president, vice president, and treasurer.

Given:

The cost of two varieties of tea is ₹300 and ₹375 respectively.

Both varieties of tea are mixed together in the ratio 3 ∶ 2

Calculation:

According to the question,

Both the varieties are mixed = 3(300) + 2(375) = 900 + 750 = ₹1650 for 5 kg

For 5 kgs the mixture is of ₹1650 then

For 1 kg = $\frac{1650}{5}$ = ₹330

∴ The price of a mixed variety of tea per kg should be ₹330.

The correct answer is the valency of an element.

Key Points

• The chemical behavior of an element is determined by the valency of an element.
• The capacity of an element to combine with other atoms when it forms chemical compounds or molecules is known as valence or valency.

Additional Information

• Valence or valency can be calculated by two equivalent formulas:

1. valence = number of electrons in the valence shell of the free atom – number of nonbonding electrons on an atom in a molecule.

• The oxidation state of an atom in a molecule provides the number of valence electrons it has gained or lost.